Document 91YxQN2mm0rz3rBma2odargYR

N .A .H .B . IN D EX NO . 3 4 0 Bestwall Gypsum Sheathing is the only gypsum sheathing re nforced with glass fibers. The gypsum core consists of incombustible gypsum rock combined with an asphalt emulsion to provide high resistance to water. All Bestwall Gypsum Sheathing meets ASTM C79-54, including requirement for water resistance. This eliminates the need for building paper (except where required by local building code). Bestwall Gypsum Sheathing is manufactured in widths of 2' and 4'. The 2' wide sheathing is made with precision-cut tongue and groove edges to provide a structurally strong and stable wall. V tongue and groove edges fit snugly, minimizing wind infiltration. The 4' wide square edge sheathing, applied vertically, completely eliminates the need for corner bracing. It is designed to meet requirements of FHA Technical Circular 12. Incombustible! As the exterior sheathing over a wood framed wall with any exterior finish and with an interior such as %" Firestop or gypsum lath and plaster will give a wall having one hour fire resistance from either side Very little waste, low cost Reinforcement with glass fibers gives better nailing qualities and greater resistance to shock Specially treated core and face paper are water resistant Large panels may be ap plied easily and quickly. May be used on both commercial and residential build ings, wherever strong, stable walls are desired. Thickness: W Length: 8', 9' Width: 2', 4' Edges: 2' x 8' -- V Edge and Tongue and Groove 4' x 8' and 4' x 9' -- Square Edge Packaging: T\ in Mounted Application: Square Edges -- Panels shall be applied vertically with long edges parallel to the studs. Us? length necessary to span distance between sills and plates or other structural members. Center long edges on studs. V-Groove -- Apply panels horizontally at right angles to studs with grooved edge down. Break end joints on succeeding courses so that end joints in follow ing courses are not in line. All V-joint edges shall be in close contact. Nailing: Galvanized roofing nails with a %" to 7/16" head, 1 %" long, # 11 gage should be used. For 4' wide sheathing, 4" o.c. around edges at top and bottom plates, and 8" o.c. in the field. For 2' wide sheathing, 8" o.c. SGP 0025322 N .A .H .B . IN D E X NO . 3 4 0 GP 65280 GYPSUM DIVISION PAOLI, PENNSYLVANIA 19301 GYPSUM ASSOCIATION 201 North Wells Street Chicago, Illinois 60606 GYPSUM SHEATHING RECOMMENDATIONS FOR NAILING AND STAPLING FASTENER SPACING SHEATHING SIZE y2 in., 2 x 8 ft. (Applied Horizontally) Nail With siding or with diagonal bracing With no siding or diagonal bracing* Staple With diagonal bracing With siding but without diagonal bracing* y2 in., 4x8 ft.; 4 x 9 ft. (Applied Vertically) Nail Without diagonal bracing Staple W'thout diagonal bracing SPACING 8 in. o.c. 4 in. o.c. 6 in. o.c. 4 in. o.c. 8 in. o.c. field 4 in. o.c. perimeter 6 in. o.c. field 3 in. o.c. perimeter * Recommended where regulations permit the use of 1 x 8 in. horizontal wood sheathing without bracing NAILS -- l\/2 in- long galvanized roofing nail, 11 gauge, % in. to % in. head. STAPLES --16 gauge flattened galvanized wire, % in. wide crown (outside measure), 1 y2 in. long legs with divergent points. All fasteners shall be spaced not less than % in. from the ends or edges of the sheathing. They shall be driven in such a manner that the sheathing bears tightly against the framing members without cutting the face paper. SGP 0025323 FORM S-N&S-364 AIA N L t NUMBER 19-D-3 SGP 0025321