Document evZwzLkeb0dwG5nbNj7REQB0e

installation Guide for Flexboard Mineral Fiber Cement Sheets 031 Johns-Manville DUP 1010468 Construction Details Descriptive Information Cutting Methods DU 052518 IZ\ Johns-Manville Flexboard Mineral Fiber Cement Sheets What It Is Flexboard is a flexible stone-like sheet made from mineral fiber and Portland cement, combined under pressure while being formed and then hydraulically re pressed to give it extra strength and toughness. SIZE AND COLORS STANDARD FLEXBOARD - available in sneets 4' X 8'. 4' X 10'. and 4' X 12' and 1 8". 3 16". 1'4". 3/8" and 1/2" thick. The color is light gray. The finish is smooth and hard. PRE-PR1MED FLEXBOARD - sheets are 4' X 8', 4' X 10' and 4' X 12' and either 1 8". 3 16". or 1-4" thick. The pnmer coat is a light tan. Why It is Superior FIRE-RESIST ANT AND ROT-RE SISTANT -- Made of mineral fiber and cement. Flexboard does not bum. It bears the Underwriters' Laboratories, Inc. label as a non-combustible material. It is rot and rust resistant, hard to scratch or mar. never needs preservatives and is easy to keep clean. EASY TO HANDLE -- One person can lift and carry a full size sheet. A 4' X 8' sheet in 1 8" thickness weighs 40 lbs., in 3 16" thickness 60 lbs. and in 1:4" thickness 80 lbs. FLEXIBILITY -- Makes Flexboard ideal for arched ceilings and circular alcoves. The sheets may be curved in either direction. See tabie below for minimum curving radii. Where To Use It In new construction or for remodeling, Flexboard may be used on ceilings, ex tenor walls and interior partitions. De pending on the thickness used, it may be applied directly to studs, over wood or non-wood sheathings and over exist ing siding. When used for residing, re place or repair all rotten or damaged members and renail all loose siding. Pro vide a reasonably smooth base for the Flexboard. Standard Flexboard may also be used for roofing range shelters and similar semi-weatherproof struc tures. It is also a good finishing matenal for miscellaneous uses such as counter tops and chute or duct linings. Fabrication Always cut Flexboard so any roughness from cutting will be largely on the underside of the sheet. For smoothing or shaping the cut edge, use a horseshoe or wood rasp or a block and No. 1 sandpaper. SAWING -- For sawing by hand use a 10 point saw with1 little or' no set.- An expensive one is not necessary. Wet the saw with water for faster cutting. For power saws, either portable or sta tionary, use Abrasive Wheels No. C203-NB3 or No. 203 rbx made by the Carborundum Co.. Niagara Falls, New York; Dimet Rimlock Blade. Type "Standard Copper" made by the Felker Manufacturing Co,. Torrence. Califor nia. Norton Crystolon "R" made by the Norton Co., Worcester. Mass., or silicon carbide blades made by New England Carbide Tool Co. Inc., Peabody, Mass. For production work, carbide tipped saws (Carbide Saw & Tool Co.. Louis ville, Kentucky) are recommended, pro viding speed or power equipment is cor rect for saw blade used. Saw blades with 20 or more points are recommended. DUST CONTROL - Dust Control facili ties should be provided for machining operations. In wet cutting, sufficient water in the form of mist or spray must be applied to 'assure that the dust does not become airborne and is properly flushed away. When dry machining, the tools must be properiy hooded and con nected to a source of exhaust air that includes a filter medium, preferably a fabric bag filter. The OSHA asbestos standard requires that exhaust and dust collection systems be designed and maintained in accord ance with American National Standard. "Fundamentals Governing the Design and Operation of Local Exhaust Svstems," ANSI 29.2-1971.* Table saws generate dust as follows: 1. Dust escapes from bottom side as leading edge of matenal engages downward moving saw teeth. Dust is propelled downward and towards back of saw below table top. 2. Some dust generated over top of matenal cut due to rubbing of saw or binding in saw cut. Dust rises over saw and towards operator. m A typical dust control system for table saws is shown here. The dust collection system shown here has proven to be satisfactory for use with portable saws. "SCORE AND SNAP" - Place a straight edge, such as 2X4. aiong tne cutting line. Score several times with a Carbide Tipped Blade (Carbide Saw & Tool Co.. Chicago, 111.i in the Stanley No. 199 Knife (The Stanley Works. New Britain. Conn.), or with a hard pointed ice pick or awl using the straigni edge as a guide. Then, with the scored line along the edge of the bench, hold the straight edge firmly on the line, and starting at one end, "snap" off the projecting stnp intact. CIRCULAR CUTS - Lay out the circle to be cut. For small circular cuts, punch a series of holes approximately 1 8" apart, using a sharpened naii-sel. Tap with a hammer to knock out the piece. For larger cuts, first drill a hole on the circumference line as a starting point, then use a keyhole saw to complete the cut. For curves, a 9" radius (minimumi car. be cut using the point of an ordinary carpenter's saw; a 22" radius imir.imum i can be cut using about half ihp blade. DUP 1010469 American National Standards Institute Inc. 14 30 Broadway New York. New York 10018 2 DU 052519 How To Fasten NAILS--It is not possible to specify exactly the type of nail to use for each application because of the widely varying job conditions. Users must exercise judgment in selecting the appropriate type of naiL The nails listed in the following table have been selected because their char acteristics are generally satisfactory for most types of application. Tb permit driving through the sheets without pre-punching nail holes, points should be diamond, special cupped or blunt design. Nails must penetrate lumber sheathing and if apphcation is directly to studs, nails must penetrate studs one inch. LOCATION OF NAILS--From the starting edge work toward the op posite edge to "wipe" the sheet smooth. Sketch at right shows approved location and spacing of nails. If nails have to be pulled out, use a wood block between the hammer and the Flexboard NAILS FOR FLEXBOARD For Application to Lumbar Sheathing or Directly to Studs 'length and wire stio must be mcreoitd if nailing through non-tumbor shoathmg to frame; MFTAl DESIGNATION HEAD va FlEXIOAKD V' FlEXIOAKD INTERIOR & EXTERIOR CEILINGS Hot-Dipped Zinc*Cood Steel Roofing Flat* IV' x .105" IV x .120" r Yet H Htod Aluminum Alloy Asbestos Shingle foe* Noil Flat Not Avoiloblf Not Available Yi Yet Hofd*n#d Steel* * AlbtllOl Shoot -- Helix Screw Noil Flat or Slight Sutton* IV'.* 010" IV * .105" 'for oxlortor application whoro ponotrotion of moisture might be o problem, 0 waofhar 1oaling device euch 01 nooprono woshors should bo used undor tho hood *If hardened steel noils ore used for exterior application or m areas of high humidity, thoy must be hot-dipped, irnc-coertod or stainless. Yes Tot *1 Hood ADHESIVES--To prevent drumming, sheets may be cemented, using synthetic rubber base ceramic tile adhesives (3M CTA-11 or equivalent) (1 gal. covers 225 sq. ft. approx.) Apply with toothed trowel in 3" spots, L8" thick, staggered on approximately 12" centers and kept 1" from sheet edge. See sketch. Cement should only be used over continuous wood backing or plaster and must be supplemented by nailing or other means of fastening. The Flexboard must, in addition, be temporarily braced until the cement has set. DU 052521 Painting PRE-PRIMED FLEXBOARD FLEXBOARD FLEXBOARD sheets are available with a high quality, factory-applied primer that was designed to prepare the surface for decoration with any type of durable exterior paint, or with any type of intenor finish. The use of Pre printed FLEXBOARD is strongly recommended when painting is planned. Pre-Primed FLEXBOARD installed outdoors should be topcoated within three months after installation. If the primer is allowed to weather for a long time, it will be come slightly chalky. Severely chalked surfaces should be repnmed with the type of primer recommended below for Standard FLEXBOARD. especially if a water emul sion paint will be used for decoration. installed indoors and painted a) For very damp locations (such as shower rooms), use Pre-Primed FLEXBOARD, or prime as recom mended above. Then topcoat with any type of good quality interior paint, either emulsion-type or solventtype, in any desired gloss range. b) For normal locations, proceed as follows for gloss and semi-gloss finishes: -- Prime with an emulsion-type primer-sealer -- Use alkyd enamels for glossy effects - Use alkyd--or emulsion-type semi-gloss paints for medium luster finishes. In ordinary exposures. FLEXBOARD unlike conven tional wood and metal materials, requires no paint for preservation. For unusual situations such as in chemical plants where acidic coirosive atmospheres prevail, chem ically resistant coatings should be used. Johns-Manville technologists will be glad to offer advice for specific ap plications. FLEXBOARD installed outdoors and painted For a flat finish, use one or two coats of an emulsion or aikyd-type interior fiat wall paint. Painting wood battens and trim FLEXBOARD is frequently used with woo f battens and trim. Prime new wood with a so-called "new wood" oil" based, zinc-free' primer if the wood is installed outdoors. As stated previously, use Pre-Primed FLEXBOARD or the recommended primer outdoors, then paint the appro priately primed wood and FLEXBOARD with an emul- a) Use Pre-primed FLEXBOARD, or primed with t good quality solvent base alkali resistant pnmer or equivalent as recommended by reputable paint manufacturers. sion-rype paint, or any solvent-type paint recommended for outdoor wood. Properly primed FLEXBOARD will accept any paint that is satisfactory for wood. b) For topcoats, use any high quality, exterior gradVemulsion paint, or any alkyd-based (solvent-type) gloss, semi gloss, or flat paint, extenor grade. For indoor construction, prime new wood with an "enamel undercoater", then use the same flat, semi-gloss or gloss topcoat on both the wood and FLEXBOARD. Cleaning UNPAINTED FLEXBOARD -- Ordinary dirt may be removed with a fiber brush, soap and water. Detergent cleaners, like Comet, may also be used. Severe dirt stains can usually be removed by using a strong solution of sodium hypochlonte or a two per cent solution of oxalic acid. To remove oil, grease or similar stains, use carbon tetrachlonde (Carbonai. Rinse off all cleansers and acids thoroughly with clear water. PALNTED FLEXBOARD - Follow standard practices for cleaning painied surfaces. DUP 1010472 5 DU 052522 Exterior walls r Exterior Joints DIRECTLY TO STUDS-Use 3/16" or V," Flexbo*rd only. Maximum stud spacing for this method is 16" for 3/16" and 24" for l/". Cats must be installed so that all joints are formed over framing members. BUTT JOINTS-A non-corrodible metal "Z" flashing must be used at butted horizontal joints. Flashing is turned up under both the Flexboard and felt underlay ment Over non-wood sheathing form all joints over framing members. A V-joint (see inset sketch) is preferred for vertical joints not covered with battens.* OVER SOLID WOOD BACKING-Use Vi" or 3/16" Flexboard over closely boarded wood. 5/16" (minimum) plywood or old siding made reasonably smooth. First apply felt* underlayment, then erect the Flexboard. LAPPED HORIZONTAL JOINTS-Both the Flexboard and the felt underlayment are lapped. Over non-wood sheathing form all joints over framing members. A V-joint (see inset sketch) is preferred for vertical joints not covered with battens.* OVER NON-WOOD SHEATHING-Use Vi" or 3/16" ' Fiexboard. First apply a continuous felt* underlayment. ; then erect the Flexboard. Nails must penetrate into solid ; wood. j NOTE Continuous felt underlayment may be oerutted over im] pregnattd insulating board tbeatrung and scalar repellent gyprutn | sheathing BATTENED JOINTS-Over each joint between sheets use a felt gasket then apply the Flexboard barren, nailed 8" c. to c. (max.) Over non-wood sheathing form all . 9 NOTE Cat a waterproof but not raporproof membrant such as joints over framing members. I J-M No IS Asphalt Saturated Ftlt. lapped 2" at horttontal /oints . and 6" at vertical ;omrt NOTE A V-joim i made by batalinf iba adtat o: rbe ihean ap- 6 proumataly 1 16" aritb a rasp or block and tandpapar DU 052523 DUP 1010473 r I Exterior Corners 1 r i Openings INSIDE CORNER (exterior of building)-Apply a felt gasket at corner and bun the Flexboard sheets. Inset sketch shows 3/16" or Vi" Flexboard applied directly to studs. GUARDS-In openings accommodating truck traffic, pro vide substantial wood guards earned high enough to protect the Flexboard. OUTSIDE CORNER (butted)-Apply a felt gasket at comer and butt the Flexboard sheets. Inset sketch shows 3, 16" or l/" Flexboard applied directly to studs. FLEXBOARD TRIM-The use of Flexboard trim at head and jambs of openings minimizes upkeep. Provide a non-corrodible metal flashing at the head. DUP 1010474 I CORNER BOARDS-An alternate way to treat exterior j comers is to install a felt gasket over the Flexboard and I install Flexboard or wood corner boards. WOOD TRIM-With conventional wood trim the Flex board may butt against the trim or the trim may be rabetted to receive the Flexboard. Provide a non-corrodible metal flashing at the head. 7 DU 052524 Hi Board & Batten These instructions cover field application of BOARD and BATTEN construction for Standard and Pre-Primed Flexboard r FRAMING: Studs shall be spaced 16" c. to c. (maximum) and suitable framing for nailing shall be provided at all openings. SHEATHING: The insulation sheathing must provide sol id backing for the Flexboard. J-M 25/32" Weathertite Sheathing when nailed as specified provides sufficient stiff ness to permit omission of comer bracing. This construc tion is acceptable to FHA. 3. FLEXBOARD: Flexboard must be prime coated if surface is to be painted. Use Pre-Primed Flexboard or prime Standard Flexboard in the field following recommenda tions on Page 5. 4. BATTENS: Wood battens and Standard Flexboard bat tens must be primed on all four sides following recom mendations on Page 5. OUTSIDE CORNER INSIDE CORNER VERTICAL JOINT WINDOW DETAIL DUP 1010475 DU 052525 is APPLICATION: 1. SHEATHING: Apply 4' wide by suitable length sheets of 25/32" Weathertite Sheathing over studs spaced 16" c. to c. (maximum). Form all joints over framing members. Fasten sheets 3" c. to c. at all edges and 6" c. to c. at intermediate studs. Keep fasteners 3/8" from edges. For types of fasteners follow "Directions for Applying" shipped with the sheathing. 2. FELT: If felt is required by local building codes, apply continuous underiayment over the sheathing. See "Notes" on Page 6. 3. FLEXBOARD: Apply 4' wide by suitable length sheets of Flexboard forming all joints over framing members but breaking vertical joints with vertical joints of the sheath ing. Using 2" galvanized roofing nails, nail at all edges 8" c. to c. (3/8" minimum from edges) and 16" c. to c. at intermediate studs. Install a gasket behind all vertical joints of the Flexboard. If horizontal joints are required, use treatments shown on Page 6. 4. BATTENS: Apply 1" x 3" wood battens over all stud locations and nail with two 8d nails 16" c. to c. but staggered relative to the underlying nails in the Flexboard. Nails in battens should be countersunk and later puttied. Flexboard battens may also be used. 5. PAINTING: For finish painting, follow recommendations or. Page 5. DUP 1010476 ISOTZ Derails on this and preceding page i/iow wood battens and mm Standard Pre Primed Flexboard battens and trim mc\ also be used. 9 DU 052526 interior walls interior Joints DIRECTLY TO STUDS-Use 3/16" or Vi" Flexboard only. Maximum stud spacing for this method is 16" for 3 16" and 24" for Vi". Cats must be installed so that all joints are formed over framing members. MOULDINGS - Interior joints may be formed with mouldings applied according to manufacturer's direc tions. Supplemental face nailing or adhesives should be used. ] OVER SOLID BACKING -- If the backing is plywood ; iminimum thickness 5/16"), use either 1/8" or 3/16" ! Flexboard. Flexooard qualifies for a one hour rating I wnen applied over gy psum sheathing and conventional | wood framing. BUTT JOINTS--Joints may be burted with edges fitted neatly. Inset sketch shows a V-joint (preferred) made by beveling the edges of the sheets approximately 1/16" with a rasp or block and sandpaper. DUP 1010477 OVER PLASTER--Install furring strips 16" c. to c. and apply 3 16" or `a" Flexboard. All joints must be formed over furring strips. BATTENS-lnterior joints may be covered with Flex- I board (2" minimum) or wood battens. ; 10 DU 052527 Ceilings Provide 1" x 3" furring strips 16" c. to c. for 1/8" and 3/16" Flexboard; 24" c. to c. for 1/4". Install furring at right angles to joists and secure with two nails at each joist. Form all joints over furring strips. Over plaster, sound for joists before installing furring strips. For easier handling and application, 4' x 4' sheets are recommended. If desired, joints may be covered with Flexboard or wood battens. Floors Standard Flexboard, if insulted oter the proper subfloor, is well suited for exterior floors and requires little upkeep. Use 4' x 4' sheets of 3 16" or 1 4" Flexboard secured with brass screws and washers. 11 DU 052528 DUP 1010478 For Information on othor J-M Product! and System* call Product Information Cantor at (303137$1000 ... . . liiSl Johns-Manville Ken-Caryl Ranch* Denver, Colorado 80217 Salas Offices in Principal Cities ^ DUP 1010479 bs:-3sa ':-7e l. 'M ir uSA DU 052529