Document 6wqk8b145vK9v8zQd90gQzb7d

W --U\ i. _UC . * y Oi' J..t J F-ACKaNG, AND SHEET METAL AORK FOR INCREASED BRANCHED POLYETHYLENE FACILITIES AT VICTORIA PLANT VICTORIA, TEXAS BY E. I. DU PONT DE NEMOURS St CO., INC. Vilmington, Delaware PROJECT 3210 March 10,1960 DUP APPROVED BY: Design Division tie --0otk9k oo 1.1 Scope - this specification covers roof insulation under built-up roofing, built-up roofing, and all flashing and sheet metal work related thereto. 1.2 Intent - the intent of these specifications is to set forth the quality and type of materials of construction, and the work manship required for the performance of the work involved, 1.3 Manufacturers Products are sometimes named for the purpose of describing the material desired, and such naming shall not be construed as preventing the use of mat jrials of other manufacturers of equal kin4 and quality, unless such other materials are specifi cally denied acceptance herein. Samples of alternate materials to gether with complete specifications 3hall be submitted to du Pont for approval before the incorporation of such materials in th<? work, unless this requirement is waived by du Pont. 1.4 References - 1.4.1 "Du Pont" refers to the authorized representative of3. I. du Pont do Nemours 4 Co., Inc. 1.4.2 Reference to bureaus, associations, and institutes ! *" shall mean the particular specification and/or method of test ing referred to by the designated symbol or code number. The following is a tabulation of specifications pertinent to this specification and referenced Herein. Reference date of these specifications should be noted. DUP 0841004 American Society of Testing Materials 1916 Race Street, Philadelphia Pa. ASTM: C343-56 ASTM: D312-44 ASTM:/D1127-50T C20S-57T D226-56 ' C8S-56T D5-52 D227-56 D224-56 D217-52T D250-56 D173-44 D1167-58T D450-41 D517-50 D1227-52T Federal Specifications - General Services ( Superintendent of Documents U.S. Government*Printing Office,Washington' 25,D. Fed. Spec. SS-C-153 Specification No* 4232 Sheet 1 of 14 corn ; i 1.1.3 ~.i jrence to Standard Engineering Specifications shall be c jnsldered as referring to E. I. du Pont de Nemours 1 Coc , Inc., Standard Engineering Specifications. 1.5 Guarantee - ail built-up roofing, insulation and flashing -hall carry a guarantee as stated herein but shall not be bonded. 1=5.1 The contractor shall furnish a written guarantee pro tecting du Pont against defective materials and faulty workman ship in the application of insulation, roofing and built-up flashings, for a period of two years following the date of acceptance of the finished roof. 1.5.2 The applicator shall inspect all decks and ascertain that they are in the condition required by this specification. Start of work by the applicator shall imply approval of the deck surfaces, and no claim in this respect will be accepted in case of failure of roofing or insulation during the guaran tee period. 1.6 Safety Precautions - kettles shall be located so as to prevent damage to ouildings or other property. They shall not be positioned on roof deck's. Mops shall be spun or whirled at the end of work period to separate the strands and shall be stored with strands separated to prevent spontaneous combustion. Fire extinguishers shall be provided near kettles for immediate use. The fumes of hot bitumi nous materials may be toxic to some workmen. Adequate protection shall be provided to prevent burns and skin irritation, in accordance with du Pont safety rules. - :: * lo7 Miscellaneous Requirements - ' -** 1.7.1 Roof Traffic. After work of roofing is started no un-.. authorized traffic will be permitted on .roof other than that ' necessary for roofing application .and inspection. Surfacing aggregate, felts,, or other materials shall not be piled on the roof to the extent that the design loads are exceeded. Roofing materials shall not be transported over unfinished or finished, roofing, v .' 1.7.2 Building Protection* Surfaces'of walls, walks, roads, ' etc.-, shall be covered as necessary to prevent soiling or other damage resulting from roof application* ' DUP 084 / Specification No. 4232 Sheet 2 -J: .or.*, ' d! : . v fpof T-p?!3 arr1 3-r:bcIo - rcofin : si.rll' be of tb t;*pe in urcutod oy vie Gvrfecis sf-.cwn cn the drawings. Defin ions of syr.bols are as follows; 3G - Slag or Gravel Surface 1 - Slope of deck less than 1/2 inch per foot T - Predast Concrete Tile heck P - Prestressed Concrete S2ab Deck S - Metal Deck I - Insulation 20 - Twenty-year Roof Example: SG-1SI-20 Slag or gravel surface; slope less than 1/2 inch, per foot; metal deck; insulated (per drawing); twenty-year roof, "Twenty-year roof" is that which is constructed according to this specification 2,1 Materials 2. INSULATION 2.1.1 Insulation shall be of a material and thickness as called for on the drawings, or as specified herein. 2.1.1.1 Cellular Glass roof insulation shall conform to ASTM: C343.- Size of units shall be 12 Inches by 18 inches or 24 inches by 24 inches. 2.1.1.2 Rigid Insulation shall be vegetable fiberboard conforming to ASTM: 0208 and shall be guaranteed by'the manufacturer to have a thermal conductivity (k) of not moye than 0.38 at 75 degrees F. mean temperature. Insula- . tion shall be either asphalt impregnated or asphalt coated- 6 sides, and shall be chemically treated to resist rot, mold', vermin, etc. 2.1.1.3 Mineral Wool Board shall be "Fesco Board" as manu factured by F. E. ,'Schundler & Co., Inc., 504T Railroad, Joilet, Illinois. Asphalt impregnated board is not? acceptable. 2.1.2 Adhesives for applying insulation to roof deck shall be as follows: 2=,1.2.1 Pitch Emulsion shall consist of coal-tar.pitch and inert mineral fillers dispersed in water to form a stable suspension of the bitumen and filler. No asbestos reinforce-- ment shall be used. Specification No .4232 .. Sheet #3 - DUP 0841006 2.1.2.1 r'l^cli Cr.v-lston ( con'- ' i ) it shall :e hoirorcnsous c-her than the possibility of some water separation which can be overcome readily with moderate stirring. It shall be easily applicable to cleaned concrete surfaces and shall not have a pronounced or unduly objectionable odor. When applied at the rate of 4 gallons per 100 square feet to a vertical surface, it shall not sag and, upon drying, shall not flow at any temperature. Consistency. The emulsion shall be of such consistency as to be readily applicable either by brush, spray, or serrated squeegee. It shall also be of such consistency that when brushed or otherwise applied' over joints between precast roof slabs, it shall not flow or sag more than one inch downward in the joint. An indication of this property may be observed in the laboratory by brushing the emulsion over a joint between two sections of precast concrete- roof slabs spaced 1/4 inch. Composition. When tested in accordance with ASTK: D1167, it shall conform to the following requirements: Nonvolatiles Water Ash in nonvolatiles 50 percent minimum 50 percent maximum 40 percent maximum Penetration, at 77 degrees F (ASTK:D5", using cone instead of needle as covered by ASIM: D217, under total weight .and time of 150 grams, 5 seconds) after. 7 days storage,...shall be between 280 and 320. (N0T3: Sample shall be prepared by pouring directly from the batch as manufacture^' or by trans fer from another container into a one-pint paint-type can* After 7 days storage at ambient temperatures,, it shall be brought to 77 degrees F by immersion in a wafer bath for one hour, after which the entire top of the can shall be removed by cutting with a can opener, and immediately followed by testing for penetration.) frying Time. When applied to a steel plate at. the rate of 150 square feet per gallon (30 grams.per square foot), the film shall, dry in not more than 3 hours at an approximate temperature of 70 degrees F. and 50 percent relative humidity. Ifhen the above film has dried for 24 hours, it shall not flow when the plate is held at an. single .of 45 degrees and the back of the plate heated by the flame of a Bunsen burner.. DUP 0841007 Specification No4232 Sheet $1$ i.V X il.l oni ? -i 1 ?*acer.: a Is (cot.",, * i) 2..,. 2.,! rit-h Inulsion (contf.i) ^.s-err-ilsif: c-it ion. 4o re-emulsification of the dried tij.rn 3ha11 occur when, tested in accordance with AST?.'* Diir7. Moisture Absorptionc The emulsion shall absorb less than 12 percent moisture when tested in accordance with the following procedure: a) Prepare 3 copper plates approximately 6 inches square, and weighing 16 ounces per square foot. b) Weigh dry clean plates to nearest gram and record. This shall be designated weight A. c) Goat one side of the plates with emulsion 1/16 inch thick and allow to set and dry. d) Dip coated specimens for an instant in distilled ; water, wipe gently with a cloth, weigh, and record. This weight shall be designated weight B. &Ssj e) Immerse specimens in distilled \eter for two weeks. f) At the end of this period, remove specimens, wipe gently with a cloth, weigh, and record? as weight g) Compute moisture content (M) of each sample as follows: 2.1.2.2 Steep Asphalt shall conform to ASTM: D312 andf shall be as described in paragraph 4(c) thereof and covered by requirements for "Unsurfaced Steep" roofs in Table I thereof. 2.2 Storage of Materials - 2.2.1 Insulation materials shall be delivered to the site un damaged and in a dry condition,, Material received which is obviously not dry or d,? otherwise damaged shall be rejected. Storage in the field must be under roof and upon blocking above? the floor, so that when installed it is in tire dame dry condi-' tion as when received. , Specificatibh No0 4232 Sheet ^5 DUP 084100 *- I'IS'JLATION ( cor.c, *i) 2.2 3 tor a-,-; of Materials (conn'd) 2.2.2 Emuls-ons must be stored so as to prevent their freez ing. When an emulsion has frozen, it has lost its cohesivenss and thixotropic.characteristics, The water and asphalt has sepa rated and stirring will not restore its original smooth, jellylike consistency. 2o3 Application of Insulation - 2.3.1 General. No more insulation shall be applied than can be covered byall overlying plies of built-up roofing during the same work period. Perroe'able insulation (vegetable fiberboard or mineral wool board) allowed to become wet must be removed and replaced. Decks must be dry, clean and free from snow, ice, dirt, dust, refuse or other foreign materials. Insulation units shall be laid in an overall ccating of pitch emulsion or in steep asphalt as specified-in Item 2.3.3-.1 hereof. Transverse joints in insulation shall be staggered'. Joints shall be nominally tight but insulation shall not be forced inpo place. 2.3.2 Preparation of Deck Surfaces by Others. Metal decks receiving impermeable insulation shall nave flutes filled with lightweight concrete.; Placing of concrete is not a part of this specification. 2.3.3 Type of Decks - 2-.3.3.1 Metal Decko Insulation on open fluted metal checks shall be cemented with either pitch emulsion or steep asphalt. When impermeable insulation is laid on metal deck with .filled flutes, only steep asphalt shall be used. ,, 2.3.3.2 Precast Concrete Decks. Fiberboard insulation shall be cemented to precast concrete decks with pitch emulsion.. Hot adhesives shall not be used. 2.3.4 Spreading of Adhesives - 2.3o4.1 Emulsions shall be squeegeed to the deck surface or1 to the underside of the insulation in the case of open-fluted metal decks. When surfaces are smooth, it will be necessary to use- a serrated squeegee in order to deposit the specified quantity of material. .However, no more emulsion shall be ap plied than is necessary to insure adhesion of the felts. Joints between deck units steLl not be filled with emulsion; on the other hand, they need not be avoided. It is desirable to -di rect the squeegee across the units instead of in a direction'.. *- parallel to the longitudinal axis. The overlying insulation .'*, may be laid into the wet emulsion. Emulsions must not be thin ned under any circumstances. Stir only enough to eliminate water accumulation at the top of the container Specification No.4232 . Sheet 7f6 DUP 0841009 jjk'S&rl .hVjt&i- tfritttil -- uu *jrv *--%-'. i c ono * n) 2:3 Application of Insulation (cont,i) Rats of application lor emulsion is .1-1/2 to 3 gallons per 100 square feet of beck area. 2=3.4.2 Steep Asphalt. Asphalt shall not be heated in excess of 450 degrees F. "inir.um temperature at point of application shall be 350 degrees ?. Receptacles contain ing bitumen at the point of roofing application shall be kept as full as possible at all times to achieve maximum temperature uniformity. 3itumen temperatures shall be checked regularly to assure compliance with this specifi cation. The mopping into which insulation units are laid shall be uniformly applied. When insulation is applied to decks with open-flutes, the insulation units shall be coated and then flopped over and shoved into place. Steep asphalt shall be applied at a rate of 15-30 pounds per 100 square feet of deck area, de pending upon whether flutes are open or closed. 2.3.5 Edge Seals shall be provided at the exposed edge o*f in sulation at the end of each work period. Such seals shall be applied with hot bitumen and shall be arranged so as to prevent water from entering the insulation. When installed over pre cast concrete decks, all edge seals must be removed upon re sumption of work. Such removal also must include removal of bitumens from the top of the deck slabs.-. Edge seals shall be formed as shown on Standard B1E. 3. ROOFING AND FLASHING 3.1 liaterials. AH built-up roofing shall be slag or gravel sur- faced roofing, constructed over the insulation specified oh the drawings, with'either a) Tar saturated felts and coal tar pitch, or b) Asphalt saturated felts and a special asphalt compounded specifically for dead level roofs. 3.1.1 Felts. Either rag or perforated asbestos felts may be used; provided the felt saturate .'Is of the same derivative as that of the hot-applied bitumen. Felts shall be of the weight specified under Item 3.3.3.2 and shall conform to the following: 3.1.1.1 Asphalt-Saturated Rag Kelt - ASTM: D226 . DUP Specification No. 4232 , Sheet #7 o- - eBWTiiWai 1. .or Materials ( coat,'d) 3.1.1:2 Tar-Saturated ?.a : Felt - 'ASIT!: C22? 3.1 = 1.3 Asphalt-Saturated Asbestos Felt - AST7T: D250 3.1.1.4 Tar-Saturated Asbestos Felt - ASTI!: D250, except the saturant shall be coal-tar pitch from which the highly volatile constituents have been removed. 3.1.2 Dead-level Asphalt shall be weather-resistant, waterresistant bitumen containing only materials of petroleum origin. The product shall be homogeneous and free of mois ture, uniformly glossy black, and shall conform to the follow ing physical limitations. Min. Max. Melting Point (R&.B) F Penetration at: 32F, 200 g 60 sec. mm/10 77F, 100 g 5 sec. mm/lC 115F, 50 g 5 sec. nn/10 Flash Point (COC) F Ductile rt 77F, 5 cm per min.,cm Specific gravity at 60F Solubility in CCI4, % Loss on heating at 325F, 50g 5Hr.$ 140 7 25 90 500 15 1.01 99o5 150 14 35 150 * 0.5 All asphalts proposed for use under the above specification shall be tested by an independent laboratory approved by du Pont before such materials are snipped to the site. Any material not * complete ly conforming to the above will be unacceptable for use# `Sampling and-testing shall be done in accordance with applicable portions- oi ASTM; D312. 3.I#3 fteal-tar Pitch shall conform to the requirements for/. ' Type A pitch, ASTM: D450. /' 3.1.4 Slag and Gravel. Gravel shall be natural gravel op,crush ed Stone7^3ryaii3r^ee~from dirt, and be uniformly graded so/a^; to pass a 5/8n mesh and be retained on a 1/4" mesh. !When tested in , accordance with ASTH: C88, weight loss shaLl not exceed 12./percent after subjection to five cycles, when.Bodium at^&ate .is used. Crushed, noncrystalline, dblomitic limestone or brushed-chiifc shall not be used. Crushed materials which contain elongated points are not acceptable. ;' . 3.1.4.1 Slag shall be crushed blast - furnace slag,, dry and free.; from/extraneous material, and unifomrly graded,.so as t'Otpassa -5/8" mesh and he retained on 1/4rt mesh. % .-v.Cv--\ Specification No#tt.4232 Sheet #8 , oc -0 I TT O" ~ ' `ifrhai. J. cl :-.<i" eria. . _ a5r: ~v~ .,:--_a shall u 1-3/16 inch eater: r,?.iv-naiis'' i:c.-rai : c cl c'.ps as ir.trr factur-iu by ;Z Pro luces, me., :on Jt i*'., lirehir.or.t, lev; York. 3.1.6 Built-v.p Hashings shall be constructed with asphaltsat ^atiTTabrlc-and~plas`tic roof cement with reinforced asbestos cap sheets. 3.1.6.1 Reinforced Asbestos Base Flashing (for can sheets) shall generally conform to ASTK: 3224, except that* an asphalt- saturated cotton fabric shall form the reinforcing medium for an outside layer of heavy asbestos waterproofing felt. The total weight _of the material shall be 65 pounds per 108 square feet. 3.1.6.2 Saturated Fabric shall conform to A3TM: D173. 3.1.6.3 Fibrous Asphalt Roof Cement - Federal Specification 3S-C-153, iype 1. 3.1.7 Gant Strips shall be "Foamglas", cork, vegetable fiber, wood or any other suitable material. Wood cant strips shall be ''CZC" treated except when roofing is applied directly to an untrea-ed wooddeck. Size shall be as shown on the drawings. 3.1.8 Asbestos-protected Metal Flashings. Gravel Stops, and facias shall consist o? a 2l.-gage (0.6239 inch) sheet-steel core, protected on both sides with a coating of zinc into' which is applied a layer of asbestos felt while zinc is still in a molten state. The asbestos coverings shall be additionally coat-, ed with suitable asphalt surface coating, which shall be provided with a comparatively rough finish. 3.1.9 Extruded Aluminum for Gravel Stops and Facias shall be as manufactured by "Aluminum Company of America" or a du Pont approv ed equal, and as called for on the drawings. 'i - 3.1.10 Asphalt Emulsion for Glass Mesh shall be nAddexn' Heavy Duty Asphalt Emulsion as manufactured by Labco, Incorporated,. Cleveland, Ohio. ` '' 3.1.11 Glass Fabric for Concrete Pads. Glass mesh shall be ^' "Addex" Heavy Duty Glass Mesh as manufactured by Labco, Inq.,:. Cleveland, Ohio. '` 3.2 Storage - felts and similar materials shall be delivered to the .. site undamaged and in a dry condition. Material received whicii is obviously not dry"or otherwise damaged shall be rejected. Storage in the field must be under cover so that when installed! materials will be in the same dry condition as when receivedc Rolls of paper, roofing, and felt shall be stacked vert^|U^iont^h9i?Ioen^32 Sheet #9 DUP 0841012 ROOFING AND FLASHING {cont'd) 3 Application of hoofing; 3-3.1 Conditions of Roofing Subsurfaces. All surfaces to which roofing is to be applied shall be dry, clean, and free of snow, frost, ice, dirt, dust, refuse, and other foreign matter. 3*3.2 General Application Requirements. Hoofing shall ex tend to the tops of cant strips at intersecting walls, para pets, curbs, platforms, etc<>, and be neatly cut at that point; it shall extend under the flanged edge of gravels stops, etc.;' under the clamping rings or roof drains and frents, all as shown in applicable Engineering Standards. f Each strip of felt shall t be thoroughly broomed into place immediately upon application " to eliminate voids, .wrinkles, fishmouths, etc., and assure full adhesion. 3*3*3 Hot Bitumens and Felts 3*3*3*1 General. Asphalt shall be heated to 430 degrees F, maximum. Minimum temperature at point of application shall' be' 350 degrees F. Maximum kettle temperature of coal-tar pitch shall be 400 degrees F. and minimum temperature .at point of application shall be 350 degrees F. Receptacles containing bitumen on the roof shall be kept as full as possible at all times to achieve maximum temperature uniformity. . Bitumen temperatures shall be regularly checked to assure compliance with this specification. Hot bitumen shall be mopped`to roof surfaces not more than three feet ahead of the felt's as they are unrolled i#to place. Mopp.ings shall be thorough and'of uniform thickness so that at no place .does felt touch felt'*.' Felts must be applied immediately after application of the' `bitumen. - . G All plies of roofing felt, shall be applied into overall uni-v-' v form mappings of hot bitumen.- The `felt strips shall beVlaid progressively and.simultaneously by lapping each strip43/4.of , ': the strip width plus 1 inch. No more bitumen shall be applied ' ' to insulation surfaces than is sufficient for proper adhesion?. 3 c-3*3 -2 Quantities of Materials. ' All built-up roofs shallv '" ffreceive four plies of 1$ lb. felts placed with 30 lb. of hot 'i'"\ bitumen/100 sq. ft./mopping, except as specified above. ..jk- ' ^ final pouring of hot bitumen at the rate of'B0 :lb./l00 sq. ft.: of roof is required to`receive slag or gravel. A-^otal. 200 lb. hot bitumen/100 sq. ft. of .roof area is ...required. . r"'1 ~ 3.3*4 Surface Protection. While finai pouring of bitumen is still hot, slag or gravel surface coating shall; be spread.Jtlni- T formly over the roof area. Slag shalEtbe applied at the r'ate of: 300 lt./lOO sq. ft.; gravel shall be applied at the rate of 40Q lb./L0Qaq.ft. of roof area. Specification No. -4232 Sheet .#10 " DUP 0841013 A3:i~ :: j ( co } Aucl-cuticn 6.f 3 c ofin- ( ; :.rr, * 1) 3.3.5 Cant J-u.~..n5. Prefabricate3 cant strips stch as cork, vegetable fibur, cellular glass, etc., shall be applied in hot bitur.en. b'ooi cant strips applied to ocr.or than wood docks shall be cut into IS-inch ler.rths and be similarly installed. It is essential that a strip of felt at least 12 inches wide be applied in the corner behind the cant strips as required by applicable Engineering Standards. The felt shall be applied in emulsion. 3.3.6 Flashing's 3*3.6.1 Built-up Flashings where counterflashings occur shall consist of two plies of asphalt-saturated fabric and one ply reinforced-asbestos base flashing. The face of the masonry wail under built-up flashings shall be primed with - asphalt primer which shall be allowed to dry before the,first coating of cement is applied. Each ply of the flashing`shall be laid into a 1/16" to 1/8" thick coating of plastic roo'f cement, uniformly applied with a trowel. The plies of flash ing shall be stepped at the lower edge on the roof surface, by extending each layer 2 inches beyond the edge of the one below. The first layer shall extend to a line 6 inches beyond the lower edge of the cant. At p^rapat and wall surfaces-, all plies of the flashing shall extend up to the point where the . counterflashing enters the wall. When application of the final ply is completed, the upper edge of the built-up flashiig shall be fastened to the masonry with "E/Srt nails spaced not over- 4 inches center to center. After the base flashing is in place, a atrip of 15 pound felt, approximately 4 inches wide,shall.be applied in pla3tic roof cement over each vertical joint';- and a final overall 1/8 inch thick coat of plastic roof cemant -shall;J be troweled on frop the lower edge of the cant strip to thefvtopvk edge of the flashing. " 3.>.6.2 Flashing at Regiets 0 When flashings are installed ' into reglets, the materials and number of plies shall'be asv specified above, but they shall extend, only to the bottom.-..of . the cant strip. 'See Standard B92G. .* . .;* W;-?. DUP 084101 3.3.6.3 Built-up Flashings ..At ExistihgWalls orParhftetsT.' without Through-wall Metal Counterflashings shall-eonsistupf one ply of asphalt-saturated-.fabric plus one layer of 65-lb. " reinforced-asbestos jbase flashing applied in plastic,roof" cement with a 4-incxi wide strip of 15-lb. asphalt felt OT.e. the top edge and vertical joints, of the: flashingo Th'eyfdbric shall extend 6 inches onto the deck; aid'the base flashing ML ' ! * ' ` ' ' . s'V Specification-No,`4232',. ` ' Sheet #11 - ---- 3 Application cf P^ofing (coni'd) J .3 -6.3 Built-up Flashing at ixistlng vails,etc. (cor.i'i) shall overlap the fabric at least 3 inches. The tcp of the flashing shall be nailed to the rasonry with ''S/S" nails spaced 4 inches on centers before the top sealing strip is applied. After the joint sealing strips are applied, the entire surface of the built-up flashing to the* bottom of the cant strip shall receive a l/?11 thick troweled-on coat of plastic roof cement. The face of the masonry vertical sur face shall be primed with asphalt primer which shall be allowed to dry before the first- layer of flashing is applied. The metal counterflashing shall be installed as shown on Standard 3911, sealing the top edge with ''Thiokol" calking compound to complete the installation. 3.3.6.4 Flashing around Drains. Pipe, and Vents. Metal flanges, of flashing sleeves and lead flashings around drains and vents shall be applied over the built-up roofing a3 shown on Standard B102G, B103G and B104G. Two additional plies of ,15-lb. felt shall be applied over the flange to cover an area of at Ifeast 2-1/2 feet by 2-1/2 feet. The plies of the built-up roofing, sheet metal flanges, and overlaying felts shall exteni fully into the flanges of roof drains under clamping rings, and clamping rings 3hall be tightly drawn down over the roofing. 3.3*6.5 Pitch Pockets. Structural supports, handrails, and similar items resting on top of the decks shall be provided with copper pitch pockets in accordance with Standard B10-3G, r BIO as applicable. The pockets shall be provided'with $ inch wide - flanges all around. Installation shall be as specified above . for sleeves o When roofing is completed, the pocket shall be completely filled with hot bitumen (same as used for roofing)^.. 3.3.6.6 Covering for Concrete Pads and Foundations shall-be provided as follows: Apply an overall coat of asphalt-emulsion coating at the rath of 50 square feet per gallons - While coating is wet, embed one ply of glass-mesh, lapping all joints 2 inches._ Immediately after embedment of mesh, apply a second cdat of emulsion at the rate of 10G square feet per gallon and brush ir\. thoroughly. <. * When the above is dry, apply a third-coat'of emulsion at the-' rate of not more than 50 square feet per gallon. Specification No0 4232 . .Sheet #12 DUP 0841015 I -V' j - cati on cu Goof in.: ( cor.t ' a) 3*>.' -'or /on-r?*e Fads, ec;. (coiu' i) Glass mesh ana coatings mast extend downward ovjr the verti cal su:iaces of the pad so as to lap the built-up flashings entering the reglets by at least 2 inches,, 3*3 .^. 7 Workmanship a flashings shall be installed in accord ance with the applicable Engineering Standards or detail draw ings. They shall be adequately fastened by mechanical methods or cement, as the case may be. Counterflashing-i shall be bent down tightly over built-up flashings. Flashing/sKall oe a minimum of four inches, except where otherwise'specified. Asphalt Plank Walkways on Built-up Hoofs 3.4.1 Material 3.4.1ol Plank shall be mineral-surfaced asphalt plank con forming to "the requirements of ASTM: D517. Size shall be 1" thick, 12 inches wide, and 24 inches or 36 inches long.. 3.4.1.2 Application Bitumen shall be. the final mopping of roofing asphalt or pitch asspecified elsewhere in this specification. 3.4.2 Application. Plank may be laid longitudinally or trans verselybutTTHi-width of the walkway shall be 24 inches, nominal ly, unless otherwise indicated on the drawings. The roofing surface to whicli the roofing is to be applied shall be completed/ except for the application of the final bituminous mopping and gravel, and must be free of gravel or debris in the walkway area. Plank shall be laid directly on the roofing in the final mopping of hot bitumen, with joints in line and approximately 1 inch wide, firmly impressing the plank into the hot bitumen. If more than one thickness is required to raise the level above standing water in low spots in the roof, the second layer shall be applied at right angles to the first in a mopping of hot bitumen. When spi'eading the slag or gravel surface, the slag or gravel shall be spread over the walkway, and then swept off, allowing, the gravel to enter the joints. All gravel which protrudes above the surface of the plank shall be removed. Specification No< 4232 Sheet #13 O c TJ COO 5 2 o> 4.1 Xetal Flashim shall be raisurei over Phe extreme dimensions in each direction in place for figuring pay quantities. 4.2 Insulation shall be measured on the net area of insulation placed, except that no reduction shall be taken for openings of less than 20 square feet. 43 3uilt-up PwQofinr: shall be measured - a) From wall to wall including turnup at wall's. b) From wall to gravel stops and gravel stop to gravel stop including turnup at wall and turndown at gravel stop. NOTE: Turnup at curbs of openings occuring in roof surface will be added for openings of 20 sq. ft. and over; opening will be deducted,* For smaller openings no deduction for hole shall be made and no turnup wi31*be allowed. 4.4 ' Built-up Flashing shall be measured from the bottom of cant strip to the joint at? which through-wall metal flashing enters the wall, or to the top of the built-up flashing where through-wall metal flashing do not occur. Length shall be that of, the completelyfinished biuilt-up flashing only. 4.5 Asphalt Flank measurement for pay quantities under unit prices shall be on a square foot basis for single-and-do^ble-layer thick nesses. The area for payment will be determined by actual measure ment of the finished work in place. Specification No, 4232 Sheet #14 DUP 0841017