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CQ 6 CN o Z PLAINTIFF'S EXHIBIT < specifications for metal lathing and furring how to use these specifications In the opposite,table a general specification has. been listed for each type of -Metal r Lath construction. : ; This'-'- is then 'supplemented where necessary by another specification devoted-'to details which are not of a general nature. , For example, (f it is desired to write a speci fication, ori Solid Metal .Lath and Plaster .Partirtions with ChahheLStuds, SpecificationNo.l is > used and ir'isjsupplernented at the appropriate pjace iridicateHMn She specification by Supplementary Specification No. .1 -A, which is devoted . to details that have.to do only with the con struction of such type of solid partitions. ` . These specifications are written^ in; detail- so. - that complete'iriformation will be available to -^thosefwhd'Wish lt; blit they may be abbreviated as*'desired; or, this document may, be referred to' as;3fdiiows:' ' ' - : ' >> \ "All Metal Lathing and Furring shall be done in accordance with the requirements for the corre sponding class of work as specified in Specifica tions of the Metal Lath Manufacturers Associa tion, dated 1958, provided that where several methods of construction are shown, the contrac tor shall secure approval of the type he wishes to use before proceeding with the work. The lath to be used shall be as follows: etc." (Here insert weight, type and finish of lath desired.) Specifications, taken from these pages will insure not only safe and- permanent construe- tion at an economical cost, but will establish a basis for maximum .competition among -albman?s ufacturers of .Metal Lath. METAL LATH FOR STRENGTH PLASTER FOR BEAUTY IllJliiil table of contents and specifications General Type of Construction Gen. Spec. Supple mentary Spec. Nos. Page Fire Resistive Ratings Materials Design Tables Types, Weights and Spans of Metal Lath-Table 1 Loading Tables for %" Rib Metal Lath--Table II Loading Tables for Vau Rib Metal Lath--Table HI 2 3 4 Partitions and Vertical Furring i (Noncombustible Prefabricated or Channel Studs) Solid Partitions l-A Hollow Partitions 1-B Double Partitions (Sound-Insulating) 1-C Vertical Furring 1-D 5 Studless Solid Partitions 2 none 10 Metal Lath Attached Directly to: Wood Supports Wood Studs Wood Joists 3 3-A 3-B, 3-C 11 Metal Lath Attached to Noncombustible Ceiling Supports (Contact Ceilings) Steel Joists Concrete Joists 4 12 4-A 4-B Furred Metal Lath Ceilings On: Steel Joists Concrete Joists Wood Joists 5 14 5-A 5-B 5-C Suspended Ceilings of Metal Lath Below: Steel Construction Concrete Flat Slab Construction Concrete Joist Construction Wood Construction 6 16 6-A 6-B 6-C 6-D Metal Lath Beams and Cornices 7 none 18 Columns Metal Lath and Plaster Protection for Steel Columns 8 none 19 Stucco--Steel Frame Metal Lath for Exterior Stucco Reinforcing on Steel Frame Construction 9 none 19 Stucco--Wood Frame Metal Lath and Expanded Metal (Stucco Mesh) for Exterior Stucco Reinforcing on Wood Frame Construction Corner, Joint and Other Reinforcement on: Other than Metal Lath Base REVISED 1958 10 none 20 20 METAL LATH MANUFACTURERS ASSOCIATION Engineers Building Cleveland 14, Ohio SGP 0003103 Fire- Resistive Ratings Typical Metal Lath and Plaster Fireproofing ILLUSTRATIONS FIRE RESISTANCE 4-hours STEEL COLUMNS STEEL BEAMS, GIRDERS AND TRUSSES STEEL JOIST FLOORS 3-hours C 2-hours 1-hour B 4-hours B, C 3-hours 2-hours 4-hours 3-hours 2-hours 1 V2-hours 4-hours CELLULAR STEEL FLOORS (non-load bearing) HOLLOW PARTITIONS 3-hours 2 Vi-hours B 2-hours B, D 1-hour B 2 V2-hours B 2-hours B, C CONSTRUCTION 1%" gypsum-vermiculite1'0' or gypsum-perlite plaster1,0' over self-furring metal lath wrapped around column. P/2" gypsum-perlite plaster1'' over metal lath. Metal lath furred %" from column with channel brackets at approximately 2' vertical spacings. 1%" gypsum-vermiculite1,0, or gypsum-perlite plaster1,8, over self-furring metal lath wrapped around column. 1" gypsum-perlite plaster1,6, over self-furring metal lath wrapped around column. %" gypsum-sanded plaster7' 1:3 mix on metal lath. 1" gypsum-vermiculite plaster1,0, over metal lath with at least a lath and protected structural members. air space between 1" gypsum-perlite plaster8, e' on metal lath, with at least a 3" air space between lath and structural members. 1" gypsum-vermiculite plaster1,7' on metal lath.4 %" gypsum-vermiculite plaster1' 7* on metal lath.4 1" gypsum-sanded plaster'* 1:2, 1:3 on metal lath.4 Floor: 2 V2" concrete on metal lath. Ceiling: 1" gypsum-vermiculite plaster1, on metal lath. Floor: Same as above. Ceiling: %" gypsum-vermiculite plaster1, 3 4 or 1" neat wood-fibered gypsum plaster on metal lath. Floor: 2%" concrete on metal lath. Ceiling: %" gypsum-sanded plaster1' 1:2, 1:3 on metal lath. Floor: 2" concrete on metal lath. Ceiling: %" gypsum-sanded plaster'1 1:2, 1:3 mix, or portland cement plaster7, 1:2, 1:3 with 15 lbs. hydrated lime and 3 lbs. asbestos fiber per bag of cement, on metal lath. Floor: 2" concrete (minimum thickness over cells). Ceiling: %" gypsum-vermiculite plaster2, over metal lath. Metal lath required to be at least 2%" from underside of cellular steel panel. Floor: 2" perlite concrete (minimum thickness over cells). Ceiling: 1" gypsum-perlite plaster8, over metal lath. Metal lath required to be at least 3" from underside of floor panel and steel beams. Floor: 2y2" concrete (minimum thickness over cells). Ceiling %" gypsum-vermiculite plaster1, 8* plus Vi" vermiculite acoustic plastic over metal lath. Metal lath required to be at least 7%" from underside of floor panel. Floor: 3%" concrete (minimum thickness over cells). Ceiling: 1" gypsum-perlite plaster*' over metal lath. AAetal lath attached directly to underside of floor panel. Beams plastered IV2" thick over face of lath with same mix. Floor: 2" concrete (minimum thickness over cells). Ceiling: gypsum-vermiculite plaster1, 6' over metal lath. Space from lath to floor at least 15%", and from lath to beams 3V2 (See2) 1" neat wood-fibered gypsum' 1" gypsum-perlite1' neat wood-fibered gypsum' gypsum-sanded7 1:2, 1:2 mix 2%" neat wood-fibered gypsum 2%" gypsum-vermiculite or perlite plaster1 2" neat wood-fibered gypsun SOLID PARTITIONS 1 -hour 2" gypsum-sanded, 1:2, 1:2 mix %" channel studs 2" gypsum-sanded, 1:2, 1:2 mix Studless Note: Gypsum-sanded or Portland cement plaster mixed 1:2, 1:2 means 1 part neat to 2 parts sand aggregate by weight for both scratch and brown coats. 1. Scratch coat: 100 lbs. gypsum to 2 cu. ft. of aggregate. Brown coot: 100 lbs. gypsum to 3 cu. ft. of aggregate. 2. 100 lbs. gypsum to 2V2 cu. ft. of aggregate for both scratch and brown coats. 3. 100 lbs. gypsum to 3 cu. ft. of aggregate for both scratch and brown coats. 4. These rotings are bosed on tests in which light-rolled sections and open- web joists were protected with metal lath and plaster ceilings attached di rectly to the bottom flanges. 5. Tested with openings for non-combustible ducts, electrical outlets, and pipes. Their permissible combined area did not exceed 100 sq. in. per 100 sq. ft. of ceiling area. No failure, but test arbitrarily discontinued at 3 hours. 6. Plaster thickness is measured from face of metal lath to finished plaster surface. 7. Plaster thickness is measured from back plane of metal lath, exclusive of ribs, to finished plaster surface. Authorities cited are: A--Ohio State University, B--National Bureau of Standards, C--Underwriters' Laboratories, D--University of California. For additional Information or details of construction, write for TECHNICAL BULLETIN NOS. 3 and 8. ,:ll ;i!' SGP 0003104 ` 4`,- ' , 4 '* Specif*i* casf t**io.<n s for Materials i - IfiSlfc iWB Attention is called to the fact that these specifications are written upon the basis of weight only, which will insure correct in stallation and facilitate accurate inspection in the field. This basis was adopted at one of the early conferences of producers, distributors and users of Metal Lath held at the U. S. Department of Commerce. "Simplified Practice Recommendation 3-52" is the most recent publi cation of the U. S. Department of Commerce covering Metal Lath and Metal Plastering Accessories. metal lath All Metal Lath shall be made from copper alloy steel sheets, and shall be given a protective coating of rust-inhibitive paint after fabri cation, or shall be made from galvanized sheets. All Metal Lath shall be specified by weight per square yard (ex cept %" Rib Metal Lath which shall be specified by weight per square foot), and shall be of the types and weights as set forth else where in these specifications. All weights are exclusive of paper, fibre, or other backing. expanded metal reinforcing (stucco mesh) All Expanded Metal Reinforcing (Stucco Mesh) shall be made from steel sheets, and shall be given a protective coating of rustinhibitive paint after fabrication. channels Channels shall be of steel and shall be given a protective coating of rust-inhibitive paint. Width and weight of channels shall be as set forth elsewhere in these specifications. metal studs Prefabricated Metal Studs shall be given a protective coating of rust-inhibitive paint. The width shall be as set forth elsewhere in these specifications. Prefabricated Metal Studs shall be: Fabricated as channels from 18 gage strip steel, with punched openings along entire length of web, between flanges, or Fabricated from doubled No. 7 gage round rods on each side, with a single No. 7 gage round rod forming an open-web trusslike pattern, and all points of contact welded, or Fabricated from 16 gage steel angles with a single No. 7 gage round rod forming an open-web trusslike pattern between flanges, and all points of contact welded. accessories Metal plastering accessories (small-nose and bull-nose corner beads, base screed, concealed picture mold, and metal casing beads) shall be formed from galvanized steel sheets of not less than 26 gage. wire Wire shall be galvanized, annealed, and gage shall be as set forth elsewhere in these specifications. All gages are the United States steel wire gage. The weight of zinc-coated finish (galvanized) shall be not less than Type 1 as set forth in Federal Specification QQ-W-461b, Wire, Steel (Carbon), Bare and Coated. Definitions of terms The following definitions for Metal Lath construction have been established by long usage: METAL LATH--Metal Lath is of three types, designated as Dia mond Mesh (also called Flat Expanded Metal Lath), Rib or Sheet. Metal Lath is slit and expanded, or slit, punched or otherwise formed, with or without partial expansion, from copper alloy or galvanized metal sheets. Metal Lath is coated with rust-inhibitive paint after fabrication, or is made from galvanized sheets. DIAMOND MESH OR FLAT EXPANDED METAL LATH --This term is used to indicate a Metal Lath slit and expanded from metal sheets into such a form that there will be no rib in the lath. RIB--An unexpanded portion of Metal Lath which leaves the plane of the Lath at a certain angle and returns at the same angle, or a separately attached stiffening member. FLAT RIB METAL LATH-A combination of expanded Metal Lath and ribs in which the rib has a total depth of less than 1/%' measured from top inside of the lath to the top side of the rib. Vs" RIB METAL LATH--A combination of expanded Metal Lath and ribs of a total depth of approximately measured from top inside of the lath to the top side of the rib, or other Metal Lath of equal rigidity. y4" RIB METAL LATH-A combination of expanded Metal Lath and ribs of a total depth of approximately %" measured from the top inside of the lath to the top side of the rib. SELF-FURRING METAL LATH-- A Metal Lath so formed that portions of it extend from the face of the lath so that it is sep arated at least *4" from the background to which it is attached. PAPER BACKED METAL LATH OR EXPANDED METAL REINFORCING--A factory-assembled combination of any of the preceding defined types of Metal Lath or Expanded Metal Reinforc ing with paper, fibre, or other backing, the assembly being used as a plaster or stucco base. SHEET LATH-- A Metal Lath, slit, or punched or otherwise formed from metal sheets. (NOTE: See manufacturers' catalogs for detailed description of various types of Sheet Lath for special purposes.) EXPANDED METAL REINFORCING (STUCCO MESH)--A reinforcement similar to Metal Lath but cut and expanded from heavier metal sheets and especially suitable for exterior stucco work and for reinforcing cement base for tile and mosaic floors. CORNERITE OR CORNER LATH--A strip of Diamond Mesh Metal Lath bent to form a right angle and applied as corner rein forcement at all internal vertical and horizontal angles of any in terior surfaces to be plastered, including wood lath, gypsum lath fiberboard lath, and junctures at wall and ceiling intersections of dissimilar plaster bases; also used in angles where ends of Rib or Sheet Lath abut. STRIPITE OR STRIP LATH--A narrow strip of Diamond Mesh Metal Lath applied as a reinforcement over joints between sheets of gypsum lath, fiberboard lath and similar materials used as plaster bases, or at junctures between such bases. MAIN RUNNERS OR CARRYING CHANNELS-The heaviest horizontal members, supported by hangers, in a suspended ceiling and to which the furring channels or rods are attached; also may be attached direct to the construction above. FURRING CHANNELS OR RODS--The smallest horizontal members of a suspended ceiling, applied at right angles to the under side of carrying channels and to which the Metal Lath is attached; also the smallest horizontal members in a furred ceiling; also, in general, the separate members used to space Metal Lath from any surfaces over which it is applied. HANGERS--The vertical members which carry the steel framework of a suspended ceiling; also the vertical members which support fur ring under concrete joist construction; also the wires used in attach ing lath directly to concrete joist construction. CONTACT CEILING--A ceil ing composed of Metal Lath and plaster which is secured in direct contact with the construction above, without the use of runner channels or furring. FURRED CEILING--A ceiling composed of Metal Lath and plaster which is attached by means of steel channels, or rods, or wood furring strips, in direct contact with the construction above. SUSPENDED CEILING--A ceiling composed of Metal Lath and plaster and steel channels which is suspended from and is not in direct contact with floor or roof construction above. SGP 0003105 METAL 1ATH MANUFACTURERS ASSOCIATION 3 Design Tables Types and Weights of Metal Lath and Spacing of Supports .... w................. TABLE I Type of Lath Weight of Lath Lb. Per Sq. Yd. Diamond Mesh (flat expanded) Flat Rib Vs" Rib and Rod-Ribbed (1) (21 Sheet Lath (2) 2.5 3.4 2.75 3.4 3.4 4.0 4.5 Walls and Partitions Ceilings Wood Studs Solid Partitions Steel Studs, Vertical Furring, etc. Wood or Concrete Metal 16'' 16" 12" 0 0 16" 16" 16" 16" 13'/," 16" 16" 16" 19" 24"(3) 19" 24" (4) 24" (4) 24" 24" 16" 12" 19" 19" 24" 24" 24" 24" 24" (4) 24'' 24" 24" Weight's are exclusive of paper, fiber, or other backing. (1) 3.4 lb.. Ye" Rib Lath is permissible under concrete foists at 27" c.c. (2) These spacings are bosed on a narrow bearing surface for the lath. When supports with a relatively wide bearing surface are used, these spacings may be increased accordingly, and still assure satisfactory work. (3) This spacing permissibfe for solid partitions not exceeding 16' in height. For greater heights, permanent horizontal stiffener channels or rods must be provided on channel side of partitions, every 6' vertically, or else spacing shall be reduced 25%. (4) See Technical Bulletin No. 2, Sfudless Metal lath and Plaster Solid Partitions. note: For exterior stucco work. Expanded Metal Reinforcing weighing either 1.8 or 3.6 pounds per square yard may be used. Attachments shall not be greater than 6" on centers vertically. Loading Tables For Metal Lath Centering llllllll]||llll[ll[IIII!i!l[llillll[||[|][||lllliSli:!ltl]|]!llllllll!lllilli[|[l||!l|[|l!|[ll[illll[]lli1lllll|ll||lll!llll>ll[llllllll!llllllll!ll!lllllll!illllllilll!lllll!ll|[ TABLE II FOR RIB LATH%" :jiii:i!iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii^ %" and %" Rib Metal Laths are widely used as combination form, centering and reinforcing for slabs in steel construction. Weight of lath to be used may be determined from Ta bles II and III. note: For additional information and specifications on Metal Lath Centering write for Technical Bulletin No. 6. Thickness of Slab Wt. of Concrete Above Mesh (Lbs. Per Sq. Ft.) 2" 2" 2 V:" 2Vj" 3" 3" 24 24 30 30 36 36 Weight of Lath (Lbs. Per Sq. Yd.) 3.4 4.0 3.4 4.0 3.4 4.0 SAFE SUPERIMPOSED LOADS 12" 950 1090 1200 1360 1450 1650 16" 536 613 675 766 815 930 19" 380 433 479 544 578 625 24" 238 271 300 340 362 412 TABLE III FOR'A" RIB LATH l!ll!!l[|(l|[ill!ll[|lil[![!llil[lllllj!ll|[llllillll]!l]|l!lt[^ ASSUMED CONDITIONS: Figures shown are for Live Loads only; Dead loads to be added. Stress in Steel (fa)--16000 lbs. per sq. in. Stress in Concrete (fc) variable as per Table. Ratio of Modulus of Elasticity of Steel (Es) to Modulus of Elasticity of Concrete (Ec) = n = 15. Distance of Center of Gravity of Lath above Bottom of Sheet -- .163 of an in. WL Table based on moment of -----10 Thick ness of Slab Above Mesh 2" 2" 2'A" W 3" 3" 3'A" 3 Vi" 4" 4" Weight of Slab Per Sq. Ft. (Lbs.) 24 24 30 30 36 36 42 42 48 48 Weight with Vi" P.C. Plaster Under Slab* (Lbs.) 30 30 36 36 42 42 48 48 54 54 Weight of Lath Per Sq. Ft. (Lbs.) .60 .75 .60 .75 .60 .75 .60 .75 .60 .75 Resist ing Moment (R.M.) (In.-Lbs. Per Ft. of Width) 3840 5050 4940 6490 6049 7960 7160 9440 8289 10920 Stress in Concrete in Lbs. Per Sq. In. (fc) 600 690 520 620 460 550 420 490 390 460 Maximum Span for Centering Wet Concrete 3'-3" 3'-7" 2'-l 1" 3'-3" 2'-8" 2'-11" 2'-5" 2'-9" 2'-3" 2'-6" Safe Superimposed Loads (Lbs. Per Sq. Ft.) Span in Feet 3' 325 438 422 518 4' 170 233 222 302 273 373 325 442 378 514 5' 98 138 129 180 160 224 190 267 222 310 6' 59 87 78 114 98 142 117 170 138 198 To improve appearance, and to further enchance the strength of the slob, 4 of Portland cement plaster moy be used on the underside of the lath. Illllllllllllllllllllillllillllllil SGP 0003106 General Specifications No. 1 Solid and Hollow Partitions Double Partitions (Sound Insulatingj Vertical Furring With Noncombustible Studs (Prefabricated or Channel) 1.1-- ERECTION OF METAL LATH 1.1. 1--All Metal Lath shall be specified by weight per square yard in accordance with the spacing of supports as given in Table I (page 4). 1.1.2--Metal Lath shall be applied with the long dimension of the sheet across the studs; Rib Metal Lath with the ribs against the studs. For solid partitions, lath shall be applied only to one side of the channel studs. 1.1.3--Metal Lath shall be secured to supports at intervals not exceeding 6", a tie shall be placed where sides of sheets lap at supports, and at side laps of sheets between supports. Tie wire shall be not less than No. 18 gage galvanized annealed wire. Equivalent clips or other attachment devices may be used instead of wire ties. 1.1.4--Diamond Mesh Metal Lath shall be lapped at sides not less than Yj", and at ends not less than 1". End laps of sheets should generally occur only over supports; if between, ends of sheets shall be laced or adequately tied with No. 18 gage galvanized annealed wire. 1.1.5--Rib Metal Lath and Sheet Lath shall be lapped at sides by nesting outside ribs or selvage. Rib Metal Lath shall be lapped 1" at ends and Sheet Lath shall be lapped 1" at ends or nested. 1.1.6--Where the adjoining surface is to be plastered, Diamond Mesh Metal Lath shall be started one stud away from corner and be bent into the corner and carried on to the abutting wall to avoid a joint at juncture of walls, and where Rib Metal Lath or Sheet Lath is used it shall be butted into all corners, and Cornerite shall be applied over abutting lath in such angles and shall be wired at 6" intervals along each edge in all corners. (Cornerite shall not be fas tened at its corner, but only along each edge. Cornerite is not re quired for Diamond Mesh Metal Lath.) Where adjoining surface is not to be plastered, the Metal Lath shall be suitably attached to the abutting wall, and such attachments completely embedded in the plaster. 1.2--ASSEMBLY OF STUDS OR CHANNELS 1.3-- METAL BASE SCREED, PICTURE MOLD, INTEGRAL METAL TRIM, CORNER BEAD 1.3.1-- Metal base screed, picture mold, or integral metal trim shall be wired to studs or Metal Lath through holes provided in the screed, mold or trim, and, where necessary, shimmed-out to line. Metal base shall be installed according to the manufacturer's speci fications. 1.3.2-- All external angles to be plastered shall be protected with galvanized expanded wing or perforated corner beads. Corner bead shall be attached securely in such manner as to assure proper align ment during application of plaster, and for proper plaster thickness. 1.4-- BUCKS 1.4.1-- Bucks shall be carefully plumbed and either anchored to the soffit of the roof or floor above, or be temporarily braced until the plaster has set. 1.4.2-- Metal door bucks shall be installed in accordance with the manufacturer's specifications. 1.4.3-- Wood door bucks shall be of an out-to-out dimension which will permit casing to cover joint between buck and plaster at least 1". 1.4.4-- Bottom of wood door bucks shall be securely anchored to floor. Applicable Only to Metal Lath and Plaster Sound-Insulating Double Partitions 1.4.5-- Metal door bucks shall be installed in accordance with manufacturer's specifications. Where maximum sound insulation is desired, provide felt or cork-pad between buck and floor. Bucks shall be well-anchored and secured by expansion drives, through pads (where used), and penetrate at least 1" into floor and ceiling slabs. 1.4.6-- For maximum sound insulation, a split or double-buck shall be used around entire opening with cork or other insulation be tween it and floor and between halves of bucks if connection is neces sary. Provide sound-deadened casing around openings and "sound proof" doors in openings. 1.2.1 etc.-- Insert here applicable supplementary specification as follows: Solid Partitions, Specification No. 1-A (page 6). Hollow Partitions with Metal Studs, Specification No. 1-B (page 7). Sound-Insulating Double Partitions, Specification No. 1-C (page 8). Metal Lath Vertical Furring, Specification No. 1-D (page 9). Alternate Method for Removable Partitions--For removable parti tions, lower end of studs shall be secured to track channels or special stud shoes attached to wood runners, or be set in holes bored into, or wire-tied to Sd nails driven into wood floor runners of proper width nailed to wood floor or ceiling joists, such runners to be se cured to masonry floor by masonry nails or expansion drives. 1.5--PLASTERING 1.5.1--Plastering shall be gypsum, lime, Keene's cement, or portland cement or combinations of them. Plaster thickness when meas ured from the face of the Metal Lath shall be Ys" minimum. Plaster thickness when measured from the back plane of the Metal Lath, ex clusive of ribs, shall be Yi" minimum. note: Portland cement plaster is recommended for basement partitions, shower stall enclosures and elsewhere in which continued or large amounts of moisture are experienced. note: Where a partition is continuous over the face of a concrete beam or column, it should be isolated from the movement of these structural members by placing paper between the concrete and Aletal Lath. SGP 0003107 METAL LATH MANUFACTURERS ASSOCIATION 5 supplementary specification no. I-A mi....nun.................minimi SOLID PARTITIONS WITH CHANNEL STUDS (To be used in conjunction with Specification No. 1, page S) Channel Stud note: Consult manufacturers' catalogs for information on special solid partition systems and metal base. Al.2.1--Size of channel studs and thickness of solid partitions shall be determined by height of partition as set forth in Table IV. Type and weight of Metal Lath shall determine the maximum spacing of studs in accordance with Table I. A1.2.2--Channel studs shall be securely fastened to the soffit of the roof or floor above, or to the joists, or to a suspended ceiling. Channels, pencil rods, cornerite, or special types of ceiling runners may be used provided they hold the top of the studs securely in line. A 1.2.3--Ends of channel studs may be bent and nailed directly to the floor or to a wood runner, or stud ends may be set in holes cut in the top of concrete floors or into special types of metal floor runners. Metal base shall be installed according to the manufacturer's specifica tions. For solid partitions, metal base shall be filled with grout after the channel studs have been erected and either before or after the Metal Lath has been wired to the studs. A 1.2.4--Where two-piece studs are used, they shall be spliced within 2 feet of the ceiling by lapping not less than 8", with flanges interlocked and securely wired near each end of splice. Single-piece studs shall be of such length that they will not bow when erected. note: Regarding installation of bucks, see section 1.4 (page 5). TABLE IV SIZES OF COLD-ROLLED CHANNEL STUDS AND THICKNESSES OF PARTITIONS FOR VARIOUS HEIGHTS OF METAL LATH SOLID PARTITIONS A 1.2.5--Channel studs shall be placed along each side of the buck and so spaced that Metal^Lath can be wire-tied to the stud. For wood bucks, two 8d nails shall be driven in pairs at intervals of 2' beginning 9" above the floor, and the channel securely wire-tied to these nails. Channel studs shall be wire-tied to the anchors on each side of metal bucks. Alternate--Studs adjacent to buck may be omitted if other means of attaching lath is provided and buck is temporarily braced before plastering. Al.2.6--A horizontal reinforcement (Vs" x 1" flat bar or rod) shall be attached 6" to 8" above the door opening on the channel side of the partition. It shall extend continuously past the first stud beyond the opening. This reinforcement shall be saddle-tied to each vertical stud it crosses. Al.2.7--Studs shall be doubled at cased openings and partition ends protected with a galvanized metal partition cap. Al.2.8--Solid partitions shall be temporarily braced when neces sary on the channel side before application of plaster. Al.2.9--Wood Grounds--Wood grounds and wood nailing strips for attaching trim, cupboards and other fixtures shall be set true to line and shall be placed on each side of the partition and wired or Height Not to Exceed Thickness of Partition Size and Weight of Channels (per 1000 feet) 8 ft.-6 in. 12 ft. 14 ft. 16 ft. 18 ft. 20 ft. f 24 ft. 1 Vr" 2" 2V4" 2'/," 2%" 3" 3'/." 300 lb. 300 lb. %" 300 lb. %" 300 lb. 1 Vj" 475 lb. 1 V2 " 475 lb. 1 Vj" 475 lb. note: No limitations on length of these partitions for heights under 10'. Length, between columns, walls or other vertical structural members, shall not be greater than two times partition height when latter is 10' or more, nor greater than 1 Vi times height when latter exceeds 14'; nor greater than the height when it is 20' or more. For lengths exceeding these, thickness shall be increased 20%. fFor heights over 20' furnish horizontal coid*rolled channels or rod stiffeners on channel side of partition every 6' vertically. Heights over 24' shall be proportionately thicker. nailed to each other, or wired to studs, or nailed to blocks which shall be securely wired or clamped to studs. Al.2.10--Electrical Installation--Electrical outlets shall not ex ceed IV2" in depth for 2" solid partitions. The back of outlet and switch boxes shall be covered with Metal Lath. note: To minimize sound conduction it is recommended that telephone boxes, etc., in adjoining hotel rooms, apartments, etc., be installed on outside walls of the room or on non communicating partitions. 6 SGP 0003108 supplementary specification no. J-B METAL STUD HOLLOW PARTITIONS (To be used in conjunction with Gen eral Specification No. 1, page 5) note: The studs in this specification are of non-hearing type. For bearing metal stud partitions with Metal hath and plaster, all requirements for the lath, its attachment. and the plastering, remain the same. The only variation is the type of metal bearing stud and the method of erection. note: Consult manufacturers' catalogs for additional infor mation on prefabricated metal studs and metal base. B1.2.1--Studs for non-bearing hollow partitions shall be a single row of shop-fabricated or pre-assembied studs; a single row of coldrolled channels or other structural shapes with width equal to that of the finished partition (less the thickness of lath and plaster on each side); or a double row of parallel %" cold-rolled channels, or equivalent, with suitable spacers or braces. B1.2.2--Minimum size of prefabricated metal studs for non bearing hollow partitions shall be determined by the height of the partition in accordance with Table V. The maximum height for non bearing hollow partitions constructed with %" cold-rolled channel studs shall be determined by the thickness of the partition in ac cordance with Table V. Spacing of studs shall be determined by the type and weight of Metal Lath used, and shall be in accordance with Table I. Prefabricated Channel stud Bl.2.3--PREFABRICATED STUDS B1.2.3.1--Runner tracks shall be aligned accurately to the par tition layout at both floor and ceiling. They shall be secured to concrete slabs with Vz" concrete stub nails at 2' intervals, or wired to the runner or furring channels of ceilings. B1.2.3.2--Each stud shall be secured to runner tracks with two attachment shoes at both top and bottom, each wired or crimped to the stud. Bl.2.3.3--Other methods of fastening studs to floor and ceiling will be permitted provided they have equivalent strength and are approved by the architect. Bl.2.3.4--Door openings shall have a stud continuous from floor to ceiling fastened to each side of the buck. Such studs shall be wire-tied or bolted in a secure manner to metal bucks. Where wood bucks are used, two 8d nails shall be driven in pairs at intervals of 2', beginning 9" above the floor, into the wood buck and clinched over the studs to hold them securely. Bl.2.4--CHANNEL STUDS Bl.2.4.1--Channel studs shall be securely fastened to the soffit of the roof or floor above, or to the joists, or to a suspended ceiling. Channels, pencil rods, cornerite, or special types of ceiling runners may be used provided they hold the top of the studs securely in line. Bl.2.4.2--Ends of channel studs may be bent and nailed directly to the floor or to a wood runner, or stud ends may be set in holes cut in the top of concrete floors or into special types of metal floor runners. Metal base shall be installed according to the manufacturers' specifications. Bl.2.4.3--Where two-piece studs are used, they shall be spliced within 2' of the ceiling by lapping not less than 8", with flanges interlocked and securely wired near each end of splice. Single-piece studs shall be of such length that they will not bow when erected. B 1.2.4.4--Where double channels are used to form partitions, spacers, braces or separator clips shall be provided between every pair and shall be well secured to maintain alignment. They shall be of substantial design and be spaced not more than 4' apart, vertically. (No spacers required for shop fabricated studs or extra-wide channel studs.) note: Regarding installation of bucks, see section 1.4. Bl.2.4.5--Door openings shall have two channel studs (four studs required per opening) continuous from floor to ceiling fastened to Metal Lath and Plaster Hollow Partition with Metal Studs TABLE V (lllllllllllillllllllllllllllllll!!lllllllllllllllllllllllllllllllllllll!lllllllllllllllllllllllllllllllllll!llll!lll!llllllllllllllllllllllllllllllllll!llllllllllllltl HEIGHTS OF METAL LATH AND METAL STUD HOLLOW (Non-Bearing! PARTITIONS Type of Partition Face-to-Face Partition (Al Thickness (In Inches] Maximum Height (B) (In Feet) C to C Spacing of Studs 24" 19" 16" Single row of 2Vj" Prefabricated Studs Single row of 3>4" Prefabricated Studs Single row of 4" Prefabricated Studs Single row of 6" Prefabricated Studs Double row of */*" Channels (Braced) Double row of V4" Channels (Braced) Double row of Channels (Braced) 4 4V. 5 '/j 7Vi 3 4 5 9' 14' 15' 13' 18' 21' 16' 20' 22' 20' 24' 26' 14' 16' 20' (A1 Plaster .nickness %" from stud face or 5/e from face of Metal Lath; for %" Rib Metal Lath, with ribs against studs, thickness increases Vs". (B) For lengths not exceeding 1 y2 times height. For lengths exceeding this, reduce height 20%. each side of the buck. Channels shall be so spaced that Metal Lath can be wired-tied thereto. Channel studs shall be wire-tied to metal bucks in a secure manner. Where wood bucks are used, channel studs shall be nailed or screwed to buck at 2' intervals; or two 8d nails shall be driven in pairs at intervals of 2', beginning 9" above floor, into the wood buck, and the channel studs at each side securely wiretied to said nails. STIFFENERS AND GROUNDS-----Prefabricated or Channel Studs Bl.2.5--A %" cold-rolled channel reinforcement shall be placed inside the partition and 6" to 8" above the door opening. It shall extend continuously past the studs alongside the buck and to the next studs beyond the opening. This channel shall be saddle-tied to each vertical stud it crosses. B1.2.6--Partitions more than 10' long or 9' high shall be stiff ened with %" cold-rolled channels placed horizontally and not more than 6' apart vertically. Stiffeners shall be permanently wired on the inside of the partition. For unsupported height of 20' or more, horizontal stiffeners shall be IV2" cold-rolled channels. Bl.2.7--Wood grounds and wood nailing strips shall be set true to the plaster line and wired to studs, or nailed to blocks which shall be securely wired or clamped to studs. SGP 0003109 METAL LATH MANUFACTURERS ASSOCIATION 7 supplementary specification no. I1 -C iininiiiiiiiiniiiiiiiiiiiiiiiimiiiiiiiiNiainiiiiiii SOUND-INSULATING DOUBLE PARTITIONS (To be used in conjunction with Specification No. 1, page 5) Channel Studs Cl .2.1--Studs for Metal Lath double partitions shall be a double row of parallel cold-rolled channels or a double row of staggered prefabricated studs. Minimum size of studs shall be determined by the height of the partition in accordance with Table VI-A or Vl-B. Spacing of studs shall be determined by the type and weight of metal lath used, and shall be in accordance with Table I. Cl.2.2--No spacers or cross ties between the partition panels shall be used. Cl.2.2.1 -- (Alternate to Section Cl.2.2 for double partition with limited cross ties for bracing, providing a sound Joss of 45.7 decibels.) Cross ties shall be installed only at 3' intervals at mid-height along the partition length. The type of cross tie shall be dependent on partition width. (For additional information, rvrite for Technical Bulletin No. 13.) Cl.2.3--Channel studs shall be securely fastened to the soffit of the roof or floor above, or to the joists, or to a suspended ceil ing. Channels, pencil rods, cornerite, or special types of ceiling runners may be used provided they hold the top of the studs securely in line. Cl.2.3.1--(Alternate to Subsection Cl.2.3.) For additional sound insulation, ceiling runner may be insulated from ceiling slab in manner similar to that described for floor runner in Subsection Cl.2.4.1. Cl.2.4--Ends of channel studs may be bent and nailed directly to the floor or to a wood runner, or stud ends may be set in holes cut in the top of concrete floors or into special types of metal floor runners. Metal base shall be installed according to the manufacturer's specifications. Cl.2.4.1--(Alternate to Subsection Cl.2.4.) Studs shall be erected by inserting ends into floor and ceiling runners. Floor .unners shall be laid over 1" thick board or 1" thick ma chinery cork or other material having approximately equal resilient and load-carrying properties. Such board or cork, etc., shall be as wide as the finished thickness of the partition and shall be well-secured to the floor slab. Expansion drives at 36" centers, or masonry nails which shall penetrate slab at least 5/g" and be spaced not to exceed 12" on centers, or combinations of the two, shall be used. Attachments used for securing cork insulation to slab may be used simultaneously for securing and positioning floor runner, or sep arate attachments of the same type may be used for this purpose. Cl.2.5--Where two-piece studs are used, they shall be spliced within i of the ceiling by lapping not less than 8", with flanges interlocked and securely wired near each end of splice. Single-piece studs shall be of such length that they will not bow when erected. Cl.2.6--A Yi" cold-rolled channel, or other member of at least equal rigidity shall be placed horizontally on the inside of the parti tion and be securely wired to each of the channels or studs forming one face of the partition, and a similar channel or reinforcement shall be used to align and stiffen the channels or studs on the other face. Such horizontal channels shall remain permanently in the partition and shall be so located that no part of them touches either the chan nels. the lath, or the plaster keys of the other half of the partition. One such brace shall be applied every 4' in height of the partition, and at least two shall be provided for partitions 9V2' high, or over. In addition to the horizontal bracing specified in the preceding paragraph, the following shall be provided for all partitions of this type more than 9V2 high when more than 10' long. At 10' intervals an additional channel stud or other vertical stif fener shall be supplied on the inside of the partition directly opposite the regular stud. It shall be installed so that the horizontal stiffener comes between it and the regular stud and at each of these points the two studs and horizontal stiffener shall be tied together. This is to be done independently on each half or face of the partition, but no part of the construction shall run across or be tied to the other portion of the partition, the additional studs to be staggered for opposite faces of the partition. note: Regarding installation of bucks, see Section l A. For special sound insulation of bucks, see Subsections 1.4.5 and 1.4.6. Cl.2.7--Door openings shall have two channel studs (four studs required per opening) continuous from floor to ceiling fastened to each side of the buck. Channels shall be so spaced that metal lath can be wire-tied thereto. Channel studs shall be wire-tied to metal bucks in a secure manner. Where wood bucks are used, channel studs shall be nailed or screwed to bucks at 2' intervals; or tw'O 8d nails shall be driven in pairs at intervals of 2', beginning 9" above floor, into the wood buck, and the channel studs at each side securely wiretied to said nails. Cl.2.8--A cold-rolled channel reinforcement shall be placed inside the partition and 6" to 8" above the door opening. It shall ex tend continuously past the studs alongside the buck and to next studs beyond the opening. This channel shall be saddle-tied to each vertical stud it crosses. Cl.2.9--In erecting studding no part of same shall be wired or otherwise attached or permitted to make contact with piping, con duit, heat ducts, etc., within the partition. AiTnb hvnii1!!: .'-: -I ; 8 :- - SGP 0003110 VERTICAL FURRINGsupplementary specification no. 1 -D ll!lll!lil!llill!l!l!ll!!lllll!!lllll|||||!l!llll!l!!llllllllllllllllll!l (To be used in conjunction with Specification No. 1, page 5) (Walls, Columns and other Enclosures) TABLES Vl-A AND Vl-B Dl.2.1--Size of channel or prefabricated studs shall be determined according to the height of the vertical furring as set forth in Tables VI-A and VI-B. Spacing of studs shall be determined by the type and weight of metal lath used, and shall be in accordance with Table I. D1.2.2--Channel studs shall be securely fastended to the soffit of the roof or floor above, or to the joists, or to a suspended ceiling. Channels, pencil rods, cornerite, or special types of ceiling runners may be used provided they hold the top of the studs securely in line. Dl.2.3--Ends of channel studs may be bent and nailed directly to the floor or to a wood runner, or stud ends may be set in holes cut in the top of concrete floors or into special types of metal floor runners. note: Consult manufacturers' catalogs for addi tional information on metal base. D1.2.4--Where two-piece studs are used, they shall be spliced within 2' of the ceiling by lap ping not less than 8", with flanges interlocked and securely wired near each end of splice. Single piece studs shall be of such length that they will not bow when erected. HEIGHTS OF VERTICAL FURRING (Channel and Prefabricated studs) TABLE Vl-A iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiin Free-Standing Furring Recommended Maximum Unsupported Height, "A" (Based on 16" Spacings) Stud 3/i" Channel P/j" Channel 2" Channel 2V2" Prefabricated 3 V* " Prefa bricoted Height B'-Q" l0'-0" 11 '-O'* 12'-0" 17'-0" Horizontal Stiffeners, spaced same as Bracing in Table VI-8, are recommended for all FreeStanding Furring. For furring more than 16" o. c., use one-half these spacings, with minimum of 3'-6". When overall height of furring exceeds Height A in table above, install Horizontal Bracing as given in table below: Ceiling Stud Horizontal Stiffener - Floor Wall or Partition Ceiling Dl.2.5--Attachments for braced furring shall consist of nails driven securely into concrete or into masonry joints, or short pieces of %" coldrolled channels used as anchors driven into mason ry joints. They shall be spaced not to exceed 2' on centers, horizontally, and in accordance with the spacing of horizontal channels, vertically, and shall project a proper distance from the face of the wall to permit ties to be made. Special devices which are the equivalent of the nail or channel attachments may be used in lieu thereof. TABLE Vl-B jijji;JJtl11It)JiltJJJJJtlJJ1JJJfIJJJJljJJffIJIIJi!IIJJI jJI)JJIII11JJIifIU Braced Furring Recommended Maximum Distance, "B" Between Horizontal Bracing (Based on 16" Spacings! Stud %" Channel IV2" Channel 2" Channel Height 6'-0" 8'-0" 9'-0" CD Stud Horizontal Bracing -- (Attached to wall) D1.2.6--Horizontal members for braced fur ring shall be not less than cold-rolled chan nels. They shall be spaced not to exceed 4'-6" on centers with the lower and upper channels not more than 6" from the floor and ceiling respective ly, and not less than %" from the face of the wall. They shall be securely tied to attachments with three loops of No. 18 gage galvanized annealed wire, or equivalent devices. 2 V2" Prefabricated 3V* " Prefabricated 10'-0" U'-O" Floor llllllIIIV!l!llllll!Illll!lllllll!l!ll!!!lllll!lllllli:!l!IIIIllllll!II!lll!lll!l!illl!lll[!l!I[!]!lllll!l!llllll]ltlil|[|l!!>ll[llllllll!l!lillll!llllltllllllll!llll!l!lllllllllllll!llllillll!lllllllll!lllllllllllllll!l[ll!lilll!ll!llllll!![[: Horizontal members for free-standing furring shall be not less than %" cold-rolled channels. They shall be spaced not to exceed 4'-6" on centers with the lower and upper channels not more than 6" from the floor and ceiling, respectively. note: If vertical studs are securely anchored to floor and ceiling, horizontal members specified for use within 6" of such floor and ceiling on either braced or free-standing furring, may be omitted. Dl.2.7--Vertical members for braced furring shall be saddle-tied to horizontal members with three loops of No. 18 gage galvanized an nealed wire, or equivalent devices, at each crossing, and securely anchored to the floor and ceiling construction. Where furring is a considerable distance from the face of the wall, channel braces to the wall shall be provided approximately 2' on centers. Vertical members for free-standing furring shall be securely anchored to the floor and ceiling construction only. Special devices, securely attached to concrete or masonry walls, in lieu of horizontal members, may be used for support of vertical members. DT.2.8--Wood grounds and wood nailing strips shall be set true to the plaster line and wired to studs, or nailed to blocks which shall be securely wired or clamped to studs. SGP 0003111 METAL LATH MANUFACTURERS ASSOCIATION 9 Specifications No. 2 Studless Solid Partitions - - r ,, S-> v mV A? ( iHvv; :T,s1', 2.1 --MATERIALS 2.1.1-- Metal Lath shall be Diamond Mesh weighing not less than 3.4 lbs. per square yard, Flat Rib Lath weighing not less than 2.75 lbs. per square yard, Ys" Rib Lath weighing not less than 3.4 lbs. per square yard, or Rod-Ribbed Metal Lath of equal rigidity and weight, or Sheet Lath. 2.1.2-- Metal runners shall be perforated, slotted, or formed of expanded metal. Legs of angle runners shall be not less than Yz" by 2", formed of not less than 28 ga. steel. 2.1.3-- Wood floor runners shall be well dried, prime painted and a full 2" wide by iyg" high. For one-hour fire resistive partitions, wood runners shall be treated with a fire retardant material approved by the architect. 2.1.4-- Metal base and metal clips shall be approved by the archi tect. (Note: See catalogs of metal lath manufacturers for various types of metal base assemblies.) 2.1.5-- Tie Wire shall be not less than No. 18 gage galvanized annealed wire. Diamond Mesh Metal Lath hung 2.2-- METAL LATHING 2.2.1-- Metal base clips or wood floor runners shall be attached to the floors to locate the partitions accurately according to plan draw ings. Fastenings suitable to floor materials shall be used. 2.2.2-- Ceiling runners shall be located so that the Metal Lath will be in the center of the partitions and plumb. Runners shall be fastened to concrete ceilings with stub nails, expansion drives or other equivalent means. Runners shall be fastened to Metal Lath ceilings with wire ties at approximately 12" spacings. 2.2.3-- Metal Lath shall be erected with the long dimension of the sheet vertical. Sheets shall be secured first to ceiling runners with wire ties at 8" o.c. and either attached to floor runners, or metal base clips, or suitably anchored in a grouted metal base assembly. A wire tie shall be placed where sheets lap at runners. 2.2.4-- Diamond Mesh Lath shall be lapped at sides not less than Yz" Rib Metal Lath and Sheet Lath shall be lapped by nesting out side ribs or selvage. Vertical laps shall be tied at intervals not exceed ing 12". 2.2.5-- Where studless partitions intersect walls to be plastered, Cornerite shall be used to reinforce the juncture. It shall be tied at each edge, not at the angle, to the intersecting lath at 6" vertical spacings. When Diamond Mesh Lath is used in the studless partition, Cornerite can be omitted by returning the partition lath and fasten ing it to the intersecting surface. L-type runner shall be fastened to abutting walls which are not to be plastered, and the Metal Lath wired to the runner so that the complete assembly is embedded in the plas tered partition. 2.3-- TEMPORARY BRACING 2.3.1-- Partitions shall be temporarily braced until such time as the scratch and brown coats of plaster on the unbraced side have been applied and are set. 2.4-- BUCKS 2.4.1-- A channel stud shall be wire tied to anchor clips on each side of metal door bucks or wire tied to pairs of 8d nails driven into wood bucks, and so placed as to provide space for tying Metal Lath to the stud. These studs may be continuous from floor to ceil ing or they may be anchored to and extend only from the upper por tion of the buck to the ceiling. (Alternate: If desired, studs need not extend to ceiling, or may be omitted if other means of attaching lath is provided and buck is braced.) 2.5-- PLASTERING 2.5.1--Plastering shall be five-coat work. First apply scratch coat Studless Solid Metal Lath and Plaster Parti tion with Diamond Mesh or %" Rib Lath (Method of attachment to floor not detailed) Optimum height--8'-4" or less Maximum height--lO'-O" on side opposite temporary braces (if used) and allow it to set and partially dry. Then apply brown coat to unbraced side, and when it has set firm remove the temporary bracing. Next apply brown coat to previously braced side, bringing it out to make overall partition thickness 2" when finish coats are applied to both sides. 2.6--METAL BASE SCREED, PICTURE MOLD, INTEGRAL METAL TRIM, CORNER BEAD 2.6.1-- Metal base screed, picture mold, or integral metal trim shall be wired to Metal Lath through holes provided in the screed, mold, or trim, and, where necessary, shimmed-out to line. 2.6.2-- All external angles to be plastered shall be protected with galvanized expanded wing or perforated corner beads. Corner bead shall be attached securely in such manner as to assure proper align ment during application of plaster, and for proper plaster thickness. 2.7--ELECTRICAL CONDUIT, SWITCH BOXES, ETC. 2.7.1--Electrical Installation--Electrical outlets shall not exceed IV2" in depth for 2" solid partitions. The back of outlet and switch boxes shall be covered with Metal Lath. note: To minimize sound conduction it is recommended that telephone boxes, etc., in adjoining hotel rooms, apartments, etc., be installed on outside walls of the room or on noncommunicating partitions. 10 SGP 0003112 ^^^^igral^Specificcitions No. 3} ^i\ i^- ?X.vh it, > f A' ,,' '5 , '/1 " ,\ ' n i>< ' ,, '." f<v, , *' } j ' ` ; . _: :'v,. ......................................................... Metal Lath Attached Directly to Wood Supports (Studs and ibifZ? nwl 3.1 --WEIGHTS OF METAL LATH 3.1.1-- All Metal Lath shall be specified by weight per square yard in accordance with the spacing of supports as given in Table I (on page 4). 3.2--ERECTION OF METAL LATH 3.2.1-- Metal Lath shall be applied with the long dimension of the sheet across the supports; Rib Metal Lath with the ribs against the supports. 3.2.2-- Diamond Mesh Metal Lath shall be lapped at sides not less than 1/j", and at ends not less than 1". End laps of sheets should generally occur only over supports; if between, ends of sheets shall be laced or adequately tied with No. 18 gage galvanized annealed wire. 3.2.3-- Rib Metal Lath and Sheet Lath shall be lapped at sides by nesting outside ribs or selvage. Rib Metal Lath shall be lapped 1" at ends and Sheet Lath shall be lapped 1" at ends or nested. 3.2.4-- Diamond Mesh Metal Lath shall be first applied to the ceilings, and the sheets carried down 6" on to the walls and parti tions. If Metal Lath is not used on the ceilings, the lathing may start at the top of the wall and be bent and carried up 6" on to the ceiling joists so that no joints occur at juncture of ceiling and walls. On walls, Diamond Mesh Metal Lath shall be started one stud away from corner and be bent into the corner and carried on to the abut ting wall, so as to avoid a joint at juncture of walls, provided that where Rib Metal Lath or Sheet Lath is used on ceilings or walls, it shall be butted into all corners and Cornerite shall be applied over abutting lath in such angles and shall be wired at 6" intervals along each edge in all corners. (Cornerite shall not be fastened at its cor ner, but only along each edge. Cornerite is not required for Dia mond Mesh Metal Lath.) 3.2.5--Nails and staples shall be spaced not to exceed 6" on centers. A tie, nail, or other attachment shall always be placed where sides of sheets lap at supports. 3.2.6 etc.-- Insert here applicable supplementary specification as follows: Metal Lath Nailed to Wood Studs, Specification No. 3-A (below). Metal Lath Nailed to Wood Joists, Specification No. 3-B (below). Metal Lath Tied-and-Nailed to Wood Joists, Specification No. 3-C (page 12). 3.3--ALTERNATE METHODS 3.3.1--Other methods of attachment which afford equal carrying capacity may be used. supplementary specification no. 3-A METAL LATH NAILED TO WOOD STUDS (To be used in conjunction with Specification No. 3 above) A3.2.6--Diamond Mesh Metal Lath or Flat Rib Metal Lath shall be attached to vertical wood supports with not less than 4d common nails, or 1" roofing nails with J{4" diameter heads, driven to a pene tration of at least or 1" No. 14 gage wire staples driven home but without crushing the lath strands. Common nails, when used, shall be bent over to engage at least three strands of Diamond Mesh Metal Lath, or shall be bent over the ribs of Flat Rib Metal Lath. Roofing nails shall be so driven as to engage at least two strands of Diamond Mesh Metal Lath, or shall be driven through ribs of Flat Rib Metal Lath. Staples shall be so driven as to engage at least two strands of Diamond Mesh Metal Lath, or shall be driven over the ribs of Flat Rib Metal Lath. 3/a" Rib Metal Lath, and Sheet Lath, shall be attached to vertical wood supports with nails or staples 3/g" longer than respectively re quired for other laths as above, unless attachment is through rib, in which event nails or staples shall be of such length as to provide at least penetration in the vertical wood supports. supplementary specification no. 3-B ITo be used in conjunction with Specification No. 3 above) METAL LATH NAILED TO WOOD JOISTSIIIIIIIIIIIIIIIIIIIIIII1IIIIIII1UIIIIUIIIIIIIIIIIIIIIIII1IIIIIIIII (Contact Ceiling) B3.2.6--Diamond Mesh Metal Lath and Flat Rib Metal Lath shall be attached to horizontal wood supports with 11/2", No. 11 gage, barbed roofing nails with heads, spaced not to exceed 6" on centers. ya" Rib Metal Lath, and Sheet Lath, shall be attached to horizon tal wood supports with nails or staples longer than respectively required for other laths as above, unless attachment is through rib, in which event nails or staples shall be of such length as to pro vide at least l}/g" penetration in the horizontal wood supports. Metal Lath and Plaster Ceiling Directly Attached to the Underside of Wood Joists SGP 0003113 METAL LATH MANUFACTURERS ASSOCIATION 11 supplementary specification no* 3-C (To be used in conjunction with Specification No. 3, page 11) lllllllllllllllltllll! METAL LATH TIED-AND-NAILED TO WOOD JOISTS (Contact Ceiling) Space Tie* 24" or 27" O. C Along note: This construction should be used where the required holding power of nails is not obtainable, and in structures subject to greater-lhan-ordinary vibration, such as (1J School classrooms, gymnasiums, auditoriums, and other places of public assembly; (2) Buildings located in areas subject to severe earthquakes, or near oil well drilling or quarrying operations, etc. C3.2.6--Diamond Mesh Metal Lath and Flat Rib Metal Lath shall be attached to horizontal wood supports with l1/?". No. 11 gage, barbed roofing nails with heads spaced not to exceed 6" on centers. Ys" Rib Metal Lath, and Sheet Lath, shall be attached to horizon tal wood supports with nails or staples Ys" longer than respectively required for other laths as above, unless attachment is through rib, in which event nails or staples shall be of such length as to provide at least 1 Ys" penetration in the horizontal wood supports. C3.2.7--Supplemental Provisions for Tying: l6d common nails shall be driven in a horizontal position clear through joists at least 2" above the bottom edge of joists. Nails shall be spaced 24" or 27" on centers along the sides of alternate joists, the spacing depending on the width of Metal Lath sheet used, and shall be so placed that when the sheets of Metal Lath are in position the nails will be not more than 3" back from the edge of each sheet. In place of l6d common nails driven clear through joists, two 8d common nails may be used, one on each side of joist, driven diagonally downward to a penetration of at least IV2" from a point not less than 2" above the bottom edge of joists. Metal Lath and Plaster Ceiling Tied-and-Nailed to Wood Joists Metal Lath shall then be secured to each nail with not less than 2 loops of No. 18 gage galvanized annealed tie wire bent U-shaped, pushed up through the lath and the free ends given not less than three twists around the projecting point and head of the nail (or around the projecting head of each 8d nail). As an alternate method, one loop of No. 18 gage galvanized annealed wire shall be slipped over the nail on each side of the joist and the ends of this loop tied below lath. This tying shall preferably be done progressively as the sheets of Metal Lath are nailed on. General-V .-VA.1 Specifications No* 4 Metal Lath Attached to Noncombustible Ceiling Supports (Contact Ceiling) 4.1--WEIGHTS OF METAL LATH 4.1.1--All Metal Lath shall be specified by weight per square yard in accordance with the spacing of supports as given in Table I (on page 4). 4.2--ERECTION OF METAL LATH 4.2.1--Metal Lath shall be applied with the long dimension of the sheet across supports; Rib Metal Lath with the ribs against supports. 4.2.2--Diamond Mesh Metal Lath shall be lapped at sides not less than 1/2", and at ends not less than 1". End laps of sheets should generally occur only over supports; if between, ends of sheets shall be laced or adequately tied with No. 18 gage galvanized annealed wire. 4.2.3-- Rib Metal Lath and Sheet Lath shall be lapped at sides by nesting outside ribs or selvage. Rib Metal Lath shall be lapped 1" at ends and Sheet Lath shall be lapped 1" at ends or nested. 4.2.4-- Diamond Mesh Metal Lath shall be first applied to the ceilings and the sheets carried down 6" on to the walls and partitions, if walls and partitions are to be plastered, so that no joints occur at juncture of ceiling and walls. Where Rib Metal Lath or Sheet Lath is used on ceilings, and walls and partitions are to be plastered, it shall be butted into all corners and Cornerite shall be applied over abutting lath in such angles and shall be wired at 6" intervals along each edge. (Cornerite shall not be fastened at its corner, but only along each edge. Cornerite is not required for Diamond Mesh Metal Lath carried around the corner.) 4.2.5 etc.-- Insert here applicable supplementary specification as follows: Metal Lath Attached to Steel Joists, Specification No. 4-A (page 13). Metal Lath Attached to Concrete Joists, Specification No. 4-B (page 13). Il'fi'HliIffllllifilH ..niiniimiiiiHiiiiBiuiini'HiiiiiBiiiiniiiii!|]i;i: SGP 0003114 supplementary specification no. 4-A ........ ........ :i n METAL LATH ATTACHED TO STEEL JOISTS ITo be used in conjunction with Specification No. 4r page 12) A4.2.5--Metal Lath shall be securely attached to the underside of steel joists by one loop of No. 16 gage galvanized wire or 2 loops of No. 18 gage galvanized annealed wire. Wire shall be twisted (Contact Ceiling) beneath the Metal Lath as for tie wire. Ties shall be spaced at not to exceed 6" intervals. Other approved attachments may be used if of equivalent strength. Ties shall be placed where sides of sheets lap at supports and at side laps of sheets between supports. supplementary specification no. 4-B iiiiniiiiuiiiiiiiiiiiiuiuiiiiiiiiiinii METAL LATH ATTACHED TO CONCRETE JOISTS (Contact Ceiling) (To be used in conjunction with Specification No. 4, page 12) B4.2.5--Hangers for attaching Metal Lath directly to the under side of concrete joists in 20" or 30" wide form construction shall consist of hairpin, hook or loop hangers or other inserts. Hangers shall be provided with a loop or other deformation to positively enter the concrete, or be secured to the reinforcing steel. B4.2.8--In 30" wide form construction, the Metal Lath shall be attached to the concrete joists as in 20" wide form construction and shall also be tied to the channels with No. 18 gage galvanized an nealed wire at not to exceed 6" intervals. A tie shall be placed at side laps of sheets between supports. Hangers shall be of not less than No. 14 gage galvanized wire when twisted as for tie wire, and not less than No. 10 gage galvanized wire when struck over to support the lath. Hangers shall be spaced at not to exceed 5" intervals along bottom of joists. Concrete Joists - 20" Forms For 30" wide form construction, there shall also be placed a No. 12 gage galvanized wire hanger through the center of the top surface of each row of forms, and spaced at not to exceed 36" centers longitudinally. There shall be a loop in each hanger to engage the concrete. Other approved attachments or inserts of equivalent strength may be used. B4.2.6--In 30" wide form construction, %" cold-rolled channels weighing not less than 300 lbs. per 1000 lineal feet shall be erected running parallel to and between the rows of joists at approximately 36" centers, or mid-point. Hangers shall be spaced not to exceed 36" along the channels. B4.2.7--In 20" wide form construction, the Metal Lath shall be securely attached to the underside of the concrete joists by twisting the No. 14 gage wire hangers as for tie wire, or by clinching of other types of hangers. A tie shall be placed at side laps of sheets between supports. Metai Lath and Plaster Ceiling Attached Directly to the Underside of Concrete Joists SGP 0003115 METAL LATH MANUFACTURERS ASSOCIATION 13 General Specifications No. 5 SX<>*, ' "'' /,(-%j ., . * 'Mjsk "faiS \r`~ Furred Metal Lath Ceilings on Steel Joists - Concrete Joists - Wood Joists 5.1 --WEIGHTS OF METAL LATH 5.1.1-- All Metal Lath shall be specified by weight per square yard in accordance with the spacing of supports as given in Table I (on page 4). 5.3.2-- Metal Lath shall be attached to the steel furring members by No. 18 gage galvanized annealed wire ties spaced at not to exceed 6" intervals. Ties shall be placed where sides of sheets lap at supports and at side laps of sheets between supports. 5.2-- ERECTION OF FURRING 5.2.1-- Site--Furring members shall be %" pencil rods or %" cold-rolled channels, spaced in accordance with the provisions of Table VII (on page 16). When furring members are spliced, the ends shall be overlapped not less than 8" (with flanges of channels interlocked) and securely tied near each end of the splice with two loops of No. 16 gage galvanized wire. 5.2.2 etc.-- Insert here applicable supplementary specification as follows: Furred Metal Lath Ceiling on Steel Joists, Specification No. 5-A (below). Furred Metal Lath Ceiling on Concrete Joists, Specification No. 5-B (below). Furred Metal Lath Ceiling on Wood Joists, Specification No. 5-C (page 15). 5.3-- ERECTION OF METAL LATH 5.3.1-- Metal Lath shall be applied with the long dimension of the sheet across supports; Rib Metal Lath with the ribs against supports. 5.3.3-- Diamond Mesh Metal Lath shall be lapped not less than 1/2" at sides; Rib Metal Lath and Sheet Lath shall be lapped at sides by nesting outside ribs or selvage. Ail Metal Lath shall be lapped 1" at ends or nested. 5.3.4-- End laps of sheets should generally occur only over sup ports; if between, ends of sheets shall be laced or adequately tied together with No. 18 gage galvanized annealed tie wire. 5.3.5-- Diamond Mesh Metal Lath shall be first applied to the ceiling and the sheets carried down 6" on to the walls and partitions so that no joints occur at juncture of ceiling and walls. Where Rib Metal Lath or Sheet Lath is used on ceilings, and walls and partitions are to be plastered, it shall be butted into all corners and Cornerite shall be applied over abutting lath in such angles and shall be wired at 6" intervals along each edge. (Cornerite shall not be fastened at its corner, but only along each edge. Cornerite is not required for Diamond Mesh Metal Lath carried around the corner.) supplementary specification no. 5-A imiitnniiiiiiiiiininiiiiiii FURRED METAL LATH CEILING ON STEEL JOISTS (To be used in conjunction with Specification No. 5 above) Concrete poured over 3/b" Rib Metal Lath A5.2.2--Furring members shall be securely saddle-tied to the underside of steel joists with No. 16 gage galvanized wire or with other ap proved attachments of equivalent strength. Metal Lath and Plaster Furred Ceil ing on the Underside of Steel Joists supplementary specification no. 5-B llll[lll!ll!lll FURRED METAL LATH CEILING ON CONCRETE JOISTS (To be used in conjunction with Specification No. 5 above) B5.2.2--Hangers--In 20" or 30'' wide form construction, hangers for supporting furring channels or pencil rods against the bottom of concrete joists shall consist of No. 10 gage galvanized wire. In 20" wide form construction, hangers shall be placed through the center of the top surface of each row of forms and shall be spaced at not to exceed 36" centers longitudinally. In.30" wide form con struction, hangers shall be placed at the center of the top surface in every other row of forms and shall be spaced at not to exceed 36" cen ters longitudinally. In the alternate rows in 30" wide form construc tion, there shall also be placed two No. 10 gage galvanized wire hangers at not to exceed 36" on centers longitudinally in the top sur face of the forms approximately 2" from each side. 14 SGP 0003116 supplementary specification no. 5-B (continued) All hangers shall be provided with a loop or other deformation to positively enter the con crete, or be secured to the reinforcing steel. All hangers shall be of such length that the lower end of hangers may be saddle-tied or wrapped around the runners so as to develop the full strength of the hangers. Other approved attachments or inserts may be used if of equivalent strength. B5.2.3--Channels--%" cold-rolled channels, weighing not less than 300 lbs. per 1000 lineal feet, shall be erected running parallel to and between the rows of joists. Cross furring shall run transversely to the joists and runners, and shall consist of round steel pencil rods at not to exceed 19" on centers. The cross furring shall be securely saddletied to the runner channels by not less than two loops of No. 16 gage galvanized wire at each crossing or by equivalent clips or attachments. -Concrete Joist Construction A--Width of Forms-- 20* or 30* B--Width of Jolstivoriel from 4' to ' C -- Center to Center Spacing of Joists-- varies from: 24' to 28' for 20' forms 35' to 38' for 30* forms Metal Lath Metal Lath and Plaster Furred Ceiling on the Underside of Concrete Joists supplementary specification no. 5-C lllllllllllllllllllllillllll FURRED METAL LATH CEILING ON WOOD JOISTS (To be used in conjunction with Specification No. 5, page 14) note: This construction is recommended where increased fire retardance is essen tial, or where the finest job of plastering is desired. It is also especially recom mended for structures subject to greaterthan-ordinary vibration and where a very high factor of safety is desirable, such as in school buildings, auditoriums, or other places of public assembly. C5.2.2--l6d common nails shall be driven in a horizontal position clear through each joist at least 2" above the bottom edge of joist. Nails shall be spaced to conform to the spacing of furring members, and shall be so aligned that furring members will be at right angles to the joists. In place of l6d common nails driven dear through the joists, two 8d common nails may be used, one on each side of joist, driven diagonally downward to a penetration of at least U/2" from a point not less than 2" above the bottom edge of joists. C5.2.3--Channel or pencil rod furring shall be attached flush against the bottom edges of joists by securely saddle-tying the furring to each nail with not less than No. 18 gage galvanized annealed tie wire. Mefal Lath and Plaster Furred Ceiling on the Underside of Wood Joists SGP 0003117 METAL LATH MANUFACTURERS ASSOCIATION 15 General Specifications No. 6 Suspended Metal Lath Ceilings Below: Steel Construction - Concrete Flat Slab Construction - Concrete Joist Construction Wood Construction 6.1--SIZE AND SPACING OF RUNNERS AND CROSS FURRING 6.1.1--Size and spacing of channels for main runners shall con form to Table VIII, and such runners shall be cross furred with pencil rods or channels of the size and at the spacing required in Table VII. (It is recommended that when main runners are sus pended from joists that they run transverse to the direction of the joists.) Neither main runners nor cross furring shall be let into nor come in contact with abutting masonry or reinforced concrete walls or partitions. A main runner shall be located within 6" of the wall to support the ends of the cross furring, and hangers shall be located to support the ends of the main runners. When main runners are spliced, the ends shall be overlapped not less than 12" (with flanges of channels interlocked) and securely tied near each end of the splice with two loops of No. 16 gage gal vanized wire. TABLE VII Dlll]||l|l!llll[!ll!llll!ll!II!IIIII!lllllllllllllllllllll]l!l!l|]llIIIIIll![l1lll!lt[inilllllll!ll!|]||l!lllltll|]||]||[|1!in!i[ll1ll!lllllllllllllllllllllllll[l SIZE AND SPACING OF CROSS FURRING FOR FURRED AND SUSPENDED CEILINGS BASED ON SPAN OF LATH Center to Center Spacing of Supports Cross Furring Size, Type and Weight Maximum Spacing Up to 2' Up to 2'-6" Up to 3' Up to 3'*6" Up to 4' 3/e" Pencil Rods 3/e" Pencil Rods Yi" cold-rolled channels <a> 300 Lbs. per 1000 feet 19" 12" 24" 19" 16" Ventilating--Where lath and plaster ceilings are located under roof construction, it is recommended that the space thus established be ventilated. Such ventilation shall be designed in accordance with accepted engineering practice. 6.2--ATTACHMENT OF CROSS FURRING TO RUNNERS 6.2.1--The cross furring shall be securely saddle-tied to the main runners by not less than No. 16 gage galvanized wire at each crossing, or by No. 9 gage wire hairpin clips or equivalent clips or attachments. When furring members are spliced, the ends shall be overlapped not less than 8" (with flanges of channels interlocked) and securely tied near each end of the splice with two loops of No. 16 gage galvanized wire. TABLE VIII SIZE AND SPACING OF MAIN RUNNERS FOR SUSPENDED CEILINGS Center to Center Spacing of Hangers Along Runners Size of Cold Rolled Channel Main Runners (Weight per 1000 feet) Maximum Center to Center Spacing of Runners Up to 2' %" 300 lbs. 3' Up to 3' (1) V." 300 lbs. 27" Up to 3' lw 475 lbs. 4' Up to 3'-6" i'/r 475 lbs. 3'-6" 6.3--TYPES OF METAL LATH AND ATTACHMENT TO FURRING 6.3.1-- Metal Lath, of one of the types and weights listed in Table I (on page 4) for the corresponding spacing of furring, shall be at tached to the furring members with the long dimension of the sheet across the furring, and shall be carried down 6" on to the walls and partitions, or Cornerite shall be used. 6.3.2-- Metal Lath shall be attached to the steel furring members by No. 18 gage galvanized annealed wire ties spaced at not to exceed 6" intervals. Ties shall be placed where sides of sheets lap at supports and at side laps of sheets beiween supports. 6.3.3-- Diamond Mesh Metal Lath shall be lapped not less than 1/2" at sides; Rib Metal Lath shall be lapped at sides by nesting out side ribs or selvage. All Metal Lath shall lap 1" at ends. Up to 4' Up to 5' 1 Vi" 2" 475 lbs. 590 lbs. 3' 3'-6" note--Where hangers are spaced not to exceed 24" on centers along each runner or carrying channel, cross furring channels may be omitted and loth attached cross wise and directly to runner channels; provided, however, that spacing center to center of such runner channels shall not exceed the limits specified in TABLE I (on page 4). (I) This spacing for concrete joist construction only. TABLE IX llj||||jllllllll!!llll!llllill!lllllllll!l!!llllUlllllltlllllllI!IH SIZE AND SPACING OF HANGERS FOR SUSPENDED CEILINGS Maximum Ceiling Area Supported Per Hanger Maximum Center to Center Spacing of Hangers Along Runners Minimum Size of Gage Galvanized Wire Alternate Types and Sizes of Hangers for Areas Up to 17.5 Sq. Ft. 6.3.4-- End laps of sheets should generally occur only over sup ports; if between, ends of sheets shall be laced or adequately tied together with No. 18 gage galvanized annealed tie wire. Up to 12.5 sq. ft. Up to 16 sq. ft. Up to 17.5 sq. ft. 4' 4' 5' No. 9 No. 8 No. 7 3/16" or Y*" round mild steel rods or lx 3/16" fiat mild steel bars 6.4--HANGERS 6.4.1--All wire hangers shall be of such length that the lower ends of hangers may be saddle-tied or wrapped around the runners so as to prevent turning or twisting of the runners and to develop the full strength of the hangers. 6.4.2.--All wire hangers shall be type 1 galvanized. 6.4.3 etc.-- Insert here applicable supplementary specifications for type of construction involved. Suspended Ceilings of Metal Lath Below Steel Construction, Specification No. 6-A (page 17). Suspended Ceilings of Metal Lath Below Concrete Flat Slab Construction. Specification No. 6-B (page 17). Suspended Ceilings of Metal Lath Below Concrete Joist Construc tion. Specification No. 6-C (page 17). Suspended Ceilings of Metal Lath Below Wood Construction. Specification No. 6-D (page 18). PROTECTION OF HANGERS--Rod and fiat hangers may be ordinary unpainted mild steel, except where there is excessive moisture or corrosive fumes, all rod and fiat hangers shall be coated with rust-inhibitive paint. Painting also is recommended for theaters and auditoriums, and large ceilings in public buildings. In Concrete Joist Construction, Y*" round mild steel hangers may be placed 48" on center in alternate rows of concrete joists in 20" wide form construction. ATTACHMENT OF FLAT HANGERS TO MAIN RUNNER (CARRYING) CHANNELS-- lower ends of fat steel hangers shall have holes punched at the proper distance (but not closer than 3/a" from ends) to which the runner channel shall be bolted with not less than 3/e" diameter bolts, provided that for ceilings over auditoriums, theatres and other public buildings and elsewhere where an added factor of safety is desirable, the lower end of flat steel hangers shall be long enough to bend up sharply as stirrups under runner channel to which they shall be bolted as already described, and shall continue up and be securely tied to main portion of hanger not less than 6" above runner channel. (If live loads or additional dead loads are contemplated, hanger and channel sizes, and method of attachment must be designed accordingly.) HANGERS TO RESIST COMPRESSION--In regions subject to tornadoes or cyclones, where upward pressures are likely to be exerted or where suspended ceiling areas are exposed to high winds through outside openings during construction, hangers shall either be of a type to resist compression, or struts of 3A" channels or tees (of heavier size where hangers exceed 4' o.c.) nay be used. These struts shall be used vertically between runner channe's and the construction above, being spaced not to exceed 8' o.c. in both directions. They shall be in addition to the regular hangers. ....... ....... . SGP 0003118 16 supplementary specification no. 6-A {To be used in conjunction with Specification No. 6, page 16) A6.4.3--Size and spacing of hangers for Metal Lath ceilings suspended from steel construction shall be as provided in Table IX (on page 16). A6.4.4--For steel beams, joists or other steel construction, hangers shall be wrapped around, inserted through, or clipped or bolted to steel structural supports, so as to develop the full strength of the hangers. All wire hangers shall be of ample length such that the lower end of hangers may be saddle-tied or wrapped around the runners so as to develop the full strength of the hangers. Mefal Lath and Plaster Ceiling Suspended from Steel Construction SUSPENDED CEILINGS OF METAL LATH BELOW STEEL CONSTRUCTION Steel Joist (or f Beam) Runner Channel! Cross-Furring Metal Lath SUSPENDED CEILINGS OF METAL LATH BELOW supplementary specification no. 6-B iiiiiiiKiiniiiiiiniiiiiiiiiiiiinnii' CONCRETE FLAT SLAB CONSTRUCTION (To be used in conjunction with Specification No. 6, page 16) B6.4.3--Size and spacing of hangers for Metal Lath ceilings suspended from concrete flat slab construction shall be as pro vided in Table IX (on page 16). B6.4.4--Hangers shall be secured to steel reinforcement in concrete with cinder aggregate and may be secured to steel rein forcement or looped or embedded in concrete with other types of aggregates. B6.4.5--Special inserts, at least equivalent in strength to the hangers, to w'hich the hangers can later be attached, may be inserted through or attached to the top of the forms in lieu of anchoring the hangers directly in the concrete. \ Flat Slab^ Av.a:' a:;.: /'* . Runner ' /^F><Saddle^Tie it.Chyannels---pHfalslf \L- * . - 4 k-------^ Channels Metal Lath and Plaster Ceiling Suspended from Concrete Flat Slab Construction supplementary specification no. 6-C ll[ll!lllll!lll]!!l[!l!l[ll[lllllllll!l!!ll SUSPENDED CEILINGS OF METAL LATH BELOW CONCRETE JOIST CONSTRUCTION (To be used in conjunction with Specification No. 6, page 16) C6.4.3--Size of hangers for Metal Lath ceilings suspended from concrete joist construction shall be as provided in Table IX (on page 16). C6.4.4--Hangers shall be inserted through the centering at the bottom of joists, and shall be provided with a loop or other defor mation to positively enter the concrete, or be secured to the reinforc ing steel. In 20" wide form construction, bangers shall be spaced at 48" on centers longitudinally in alternate rows of concrete joists. In 30" wude form construction, hangers shall be spaced at 48" on centers longitudinally in each row of joists. Other approved attachments or inserts may be used if of equiva lent strength. Metal Lath and Plaster Ceiling Suspended from Concrete Joist Construction SGP 0003119 METAL LATH MANUFACTURERS ASSOCIATION 17 supplementary specification no. 6-D (To be used in conjunction with Specification No. 6, page 16) SUSPENDED CEILINGS OF METAL LATH BELOWIll[l![l!ll!l1llll!!f!lllllllllllllii!l!ll WOOD CONSTRUCTION Alternate: D6.4.3--Size and spacing of hangers for Metal Lath ceilings sus pended from wood construction shall be as provided in Table IX (on page 16). D6.4.4--Wire hangers shall be inserted in holes drilled a mini mum of 3-in. above bottom of joists and with the upper end of the hanger in each case twisted three times around itself, or D6.4.S--Wire hangers shall be attached to 30d nails, driven on a downward slant into sides of joists which are sufficiently wide to permit not less than 3 inches penetration into the wood. Such nails shall be driven at least 3" from bottom edges and not over 36" on centers, with the upper end of the hanger in each case twisted three times around itself, or D6.4.6--Four l'/i" No. 9 gage wire staples shall be used to secure wire hangers to the side of joists. Staples shall be driven horizontally or on a downward slant, three near the upper end of the loop and the fourth to fasten the loose end, or D6.4.7--When purlins exceed spacings of 4' o.c., iy2" No. 0 screw eyes shall be fastened into heavy wood flooring at not over 3' o.c. so that they will support an area not over 9 square feet, with upper end of hanger to be inserted in screw eye and in each case twisted three times around itself. (This spacing is determined on re sistance to withdrawal of the No. 0 screw eye in Northern White Pine. When wood offering greater resistance is used, the spacing Metal Lath and Plaster Ceiling Suspended from Wood Construction may be slightly increased or a smaller size screw eye would be per mitted. Example: A No. 4 screw eye in Douglas Fir has equivalent resistance to withdrawal to a No. 0 in Northern White Pine, or D6.4.8--Flat hangers, if used, shall be spiked to sides of joists with two 12d nails driven through holes drilled in the hanger and clinched at least 3 inches above bottom of joists. 7.1-- SIZE, WEIGHT AND SPACING OF BRACKETS 7.1.1-- Brackets shall be formed of %" cold-rolled channels weighing not less than 300 lbs. per 1000 lineal feet, or from ?f6" by 1" flat steel, and shall be spaced as follows: 7.1.2--Where cold-rolled channels are used for longitudinal furring each member of the cornice or beam brackets shall be not more than 3'-0" apart. 7.1.3-- Where (4" pencil rods are used to fur each member, brackets shall not exceed 19" apart. 7.1.4-- Where furring is not intended to be used at each member, brackets shall not exceed 13V2" on cen" ters for 3.4. lb. Diamond Mesh Metal Lath, provided that at least one runner bar or channel shall be installed to hold work in proper shape. Metal Lath and Plaster Beam Formed as Part of a Suspended Ceiling 7.2-- TIE WIRE 7.2.1--Wire for tying brackets to structural members shall be not less than No. 14 gage galvanized wire using saddle tie, or use six loops of No. 18 gage galvanized annealed wire; for tying longi tudinal rods to brackets, wire shall be not less than No. 18 gage galvanized annealed wire, and for tying Metal Lath to rods or chan nels, wire shall be not less than No. 18 gage galvanized annealed wire. as the case may require, and be spaced as in Section 7.1 pre ceding. For fastening brackets to concrete or masonry beams or walls, holes shall be drilled and plugged, or other equally strong anchorage shall be provided; when fastening to terra cotta, toggle bolts or suit able anchor shall be used. 7.3.2--Longitudinal channels or rods shall be wire tied or bolted to brackets. 7.3--ERECTION OF BRACKETS, CHANNELS AND RODS 7.3.1--Brackets shall be formed to template to require a minimum of plaster (but in no case less than %" thickness), in accordance with details furnished by the architect. Brackets shall be securely wired, bolted or clamped to walls, ceilings, or structural members, 7.4--ERECTION OF METAL LATH 7.4.1--Metal Lath shall be applied to the longitudinal channels or rods or direct to brackets and be bent into and made to conform with the outline of the finished beam or cornice. Side laps shall not occur at the corners, but lath shall be carried around to the next member, or corner strips shall be used at all corners. 11111111 18 SGP 0003120 e;; IjlllSSfJl Metal Lath and Plaster ProtectionIplf for Steel Columns . > . _ . Corner beads set for required thickness of plaster Self-furring diamond mesh metal lath Plaster Va " cold-rolled furring channels at approx. 2 ft. spacing Diamond mesh metal loth placed over furring channels Optional Methods for Lathing Steel Columns 8.1--METAL LATH 8.1.1--Metal Lath shall be Diamond Mesh or Self-Furring and weigh not less than 3.4 lbs. per square yard. 8.3--CORNER BEAD 8.3.1--Corner beads shall be fastened at each corner with steel clips or wire ties so that they are rigid, straight and adjusted to per mit the required thickness of plaster. 8.2--ERECTION OF LATH 8.2.1--Metal Lath shall be formed to fit around the column and shall be furred at least YY' from the face of the steel flange to pro vide space for the plaster to key. Self-Furring Metal Lath requires no additional furring devices. Diamond-Mesh Metal Lath shall be furred with channel brackets, special clips or L-shaped spacers cut from Metal Lath and inserted horizontally between the lath and the column flanges. 8.4--PLASTERING 8.4.1--Lightweight aggregate-gypsum plaster shall be used for two, three and four-hour fire protection. For one-hour protection, gypsum-sanded plaster may be used. (Consult local building code for thickness of plaster required and proportions of plaster mix. Complete data on fireproofing with metal lath and plaster is avail able from the Metal Lath Manufacturers Association. Write for Technical Bulletin Nos. 3 and 8.) note: For enclosure of columns with vertical furring see Specification No. I-D. page 9- ,, ,r \ ^ >t ' Metal Lath for Exterior Stucco Reinforcing on Steel Frame Construction 9.1-- STUDDING OR FURRING FOR METAL LATH 9.1.1-- Studding or furring of light steel channels, pressed steel members, steel reinforcing rods or metal studs, spaced as required by the particular system of wall construction used, shall be securely fas tened to the structural frame by wire ties or clips, by bolting or by welding. Steel channels and pressed steel members shall be furnished to the job painted with one factory or shop coat of rust-inhibitive paint. 9.2-- METAL LATH 9.2.1-- Reinforcing shall be not less than 3.4 lb. Diamond Mesh Metal Lath, cut from galvanized sheets, for which supports shall be spaced not more than 16" on centers. L:nless back-plastered construc tion is employed, Rib Metal Lath shall not be used. Lath shall be ap plied with the long dimension of the sheet across supports and shall be attached to the studs or furring by wire ties of No. 18 gage galvanized annealed tie wire, or by nailing or by equivalent attachments, spaced at intervals not exceeding 6" along such studs or furring members. Lath shall be lapped at sides not less than y2", and at ends not less than 1". End laps of sheets should generally occur only over supports and shall be staggered; end laps of sheets between supports shall be securely laced together with No. 18 gage galvanized annealed tie wire. Sheets shall be returned around corners at least 4". note: Spacings for supports in this Specification are estab lished at a maximum of 16" based on the allowable span of the Metal Lath. When structural members exceed 16" spac ing then provision should be made for intermediate support of the Lath. ray -...........- SGP 0003121 METAL LATH MANUFACTURERS ASSOCIATION 19 -r. ^v'-" ^ Specifications|V__f<_ ^. i.V...-.. C k-Vfr.^S*. rffv. T>?3)'' *i`V* rw. ,! * - ,a No. 10 Metal Lath and Expanded Metal (stucco Mesh) for Exterior Stucco Reinforcing on Wood Frame Construction 10.1--WHERE USED 10.1.1-- Expanded Metal Lath (Diamond Mesh) or expanded metal reinforcing (Stucco Mesh) shall be used for stucco base on all wood frame structures of open or sheathed type, over old masonry walls and all surfaces that do not provide a satisfactory bond for the stucco. 10.2--MATERIALS 10.2.1-- Reinforcing shall be Diamond Mesh Metal Lath, weighing not less than 3.4 lb. per sq. yd. and expanded from galvanized sheets or coated with rust inhibitive paint after fabrication, or Expanded Metal Stucco Mesh weighing 1.8 lb. per sq. yd. and coated with a rust inhibitive paint. Metal Lath weighing 3.4 lb. per sq. yd. shall be used on all soffits and horizontal surfaces and for back-plaster construction. 10.3--ATTACHMENT TO WOOD SUPPORTS 10.3.1--Metal Lath or Stucco Mesh shall be attached at not greater than 6" intervals vertically and 16" horizontally with galvan ized nails having a penetration into vertical wood supports of at least 1" and into horizontal wood supports of at least 114". It shall be spaced from the backing not less than 14" with furring nails or devices, or Self-Furring Metal Lath may be used. Metal Lath shall be lapped V2" at sides and 1" at ends. Stucco Mesh shall be lapped one diamond at sides and ends. End laps of sheets shall generally occur over supports and be staggered; and end laps of sheets between supports shall be laced together with No. 18 gage galvanized annealed tie wire. Sheets shall be started one stud away from the corner and be bent around so as to avoid a junction at the corner. CORNER, JOINT AND OTHER REINFORCEMENTlillllllllllllllll!lllll!lllll!ll!!l!lllllllllll!ll!lllII!!lllllllllinnilUI!!l!]|llllllllll!ll!IUIDII[llllllllllllll!lllll!ll!llllllllll!llll!linilllfllllNlllllllllt 1.0--CORNERS Metal Lath Stripite^ 1.1-- All internal vertical and hori zontal angles of any interior surfaces to be plastered (including gypsum lath and fibre-board lath) shall be continuously reinforced with Metal Lath Cornerite not less than 6" wide, 3" on each surface. Cornerite shall be attached at the outer edges. All external angles to be plastered shall be protected with galvanized ex panded wing or perforated corner beads. Use Arch Corner Bead ::j or Metal Arches ~~ * [^Casing Bead E For Doors I And Windows Expanded 2.0-- LATH JOINTS 2.1-- Wherever gypsum lath, fibre lath and similar materials are used as plaster bases, a strip of flat expanded Metal Lath (Stripite) not less than 4" wide shall be applied over joints be tween the sheets of such materials to reinforce the plaster. *i d Flange or 1 Short Flange i L._____1 Comer Bead For Plaster Return -- Expanded Wing; Perforated Flange; or Casing Bead 3.0-- OPENINGS 3.1--At all corners of openings more than 2 square feet in area in any surface to be plastered, strips of Metal Lath at least 12" wide and 24" long shall be attached over the plaster base at an angle of approximately 45 degrees. (Such additional reinforcing is not re quired over Metal Lath.) 4.0-- CHASES AND DOOR BUCKS tions shall be reinforced with Metal Lath before being covered with plaster. 5.0--INTERSECTION OF METAL LATH AND OTHER TYPES OF PLASTER BASES 5.1--Wherever Metal Lath abuts masonry, concrete or other types of bases that are to be plastered, the Metal Lath shall be returned or extended 6" onto the abutting plaster base. 4.1-- All chases or similar openings in horizontal or vertical 6.0--DISSIMILAR MATERIALS masonry surfaces or other solid bases to be plastered shall be covered with Metal Lath. 6.1--Where cement plaster is to be applied over gypsum lath or gypsum block, or where any surface to be plastered has been 4.2-- Where door buck jambs are continuous from floor to ceil previously painted, or where any masonry surface to be plastered ing in masonry partitions to be plastered, that portion of the jamb does not have adequate mechanical or chemical bond, the whole above the header shall be covered with a strip of Metal Lath at surface shall be covered with Metal Lath. (Self-Furring or "Dimpled" least 12" wide and continuous from top of opening to ceiling. Lath is recommended for smooth surfaces so that the plaster can 4.3--The unexposed back of electrical outlet boxes in solid parti- form a lasting key.) Prinf,d in u.S.A. METAL LATH , * MANUFACTURERS * *!!<> J, r vC- XJ5- ,, *" j , , '\ s- ' ASSOCIATION "engineers building CLEVELAND 14 OHIO Alabama Metal Lath Company, Inc. Birmingham 1, Alabama The Bostwick SteeLLath Company Niles, Ohio Ceco Steel Products Corporation Chicago 50, Illinois The Goldsmith Metal Lath Company Cincinnafi 32, Ohio Inland Steel Products Company Milwaukee 1, Wisconsin National Gypsum Company Buffalo 2, New York Penn Metal Company, Inc. Parkersburg, West Virginia Truscon Steel Division Republic Steel Corporation Youngstown, Ohio | TM United States Gypsum Company;; Chicago 6, Illinois Wheeling Corrugating Company Wheeling, West Virginia SGP 0003122