GYPSUM BOARD MATERIALS AND ACCESSORIES
|Accessories for gypsum board||ASTM C 1047|
|Adhesives for fastening gypsum wallboard||ASTM C 557|
|Elastomeric joint sealants||ASTM C 920|
|Fiber-reinforced gypsum panels||ASTM C 1278|
|Glass mat gypsum backing panel||ASTM C 1178|
|Glass mat gypsum panel||ASTM C 1658|
|Glass mat gypsum substrate||ASTM C 1177|
|Joint reinforcing tape and compound||ASTM C 474; C 475|
|Nails FOR gypsum boards||ASTM C 514, |
F 547, F 1667
|Steel screws||ASTM C 954; C 1002|
|Steel studs, load-bearing||ASTM C 955|
|Steel studs, nonload-bearing||ASTM C 645|
|Standard specification for gypsum board||ASTM C 1396|
|Testing gypsum and gypsum products||ASTM C 22; C 472; |
LATH, PLASTERING MATERIALS AND ACCESSORIES
|Accessories for gypsum veneer base||ASTM C 1047|
|Blended cement||ASTM C 595|
|Exterior plaster bonding compounds||ASTM C 932|
|Gypsum casting and molding plaster||ASTM C 59|
|Gypsum Keene’s cement||ASTM C 61|
|Gypsum plaster||ASTM C 28|
|Gypsum veneer plaster||ASTM C 587|
|Interior bonding compounds, gypsum||ASTM C 631|
|Lime plasters||ASTM C 5; C 206|
|Masonry cement||ASTM C 91|
|Metal lath||ASTM C 847|
|Sand||ASTM C 35; C 897|
|Perlite||ASTM C 35|
|Vermiculite||ASTM C 35|
|Plastic cement||ASTM C 1328|
|Portland cement||ASTM C 150|
|Steel screws||ASTM C 1002; C 954|
|Steel studs and track||ASTM C 645; C 955|
|Welded wire lath||ASTM C 933|
|Woven wire plaster base||ASTM C 1032|
Gypsum board and gypsum plaster construction shall be of the materials listed in Tables 2506.2 and 2507.2. These materials shall be assembled and installed in compliance with the appropriate standards listed in Tables 2508.1 and 2511.1.1, and Chapter 35.
INSTALLATION OF GYPSUM CONSTRUCTION
|Gypsum board||GA-216; ASTM C 840|
|Gypsum sheathing||ASTM C 1280|
|Gypsum veneer base||ASTM C 844|
|Interior lathing and furring||ASTM C 841|
|Steel framing for gypsum boards||ASTM C 754; C 1007|
2. On single-layer systems where joints occur over wood framing members.
4. On multilayer systems where the joints of adjacent layers are offset from one to another.
5. Assemblies tested without joint treatment.
|MATERIAL||THICKNESS OF MATERIAL (MINIMUM) (inches)||SPACING OF FRAMING |
|SHEAR VALUEa, b |
(plf of ceiling)
|MIMIMUM FASTENER SIZE|
|Gypsum board||1/2||16 o.c.||90||5d cooler or wallboard nail; |
15/8-inch long; 0.086-inch shank;
|Gypsum board||1/2||24 o.c.||70||5d cooler or wallboard nail; |
15/8-inch long; 0.086-inch shank;
Water-resistant gypsum backing board shall not be used in the following locations:
1. On horizontal supports of ceilings or roof soffits.
2. On interior walls.
Water-resistive barriers shall be installed as required in Section 1404.2 and, where applied over wood-based sheathing, shall include a water-resistive vapor-permeable barrier with a performance at least equivalent to two layers of Grade D paper. The individual layers shall be installed independently such that each layer provides a separate continuous plane and any flashing (installed in accordance with Section 1405.4) intended to drain to the water-resistive barrier is directed between the layers.
Plastering gypsum plaster or cement plaster shall not be less than three coats where applied over metal lath or wire fabric lath and not less than two coats where applied over other bases permitted by this chapter.
Installation of lathing and plaster materials shall conform with Table 2511.1.1 and Section 2507.
INSTALLATION OF PLASTER CONSTRUCTION
|Cement plaster||ASTM C 926|
|Gypsum plaster||ASTM C 842|
|Gypsum veneer plaster||ASTM C 843|
|Interior lathing and furring |
|ASTM C 841|
|Lathing and furring (cement plaster)||ASTM C 1063|
|Steel framing||ASTM C 754; C 1007|
First and second coats of cement plaster shall be applied and moist cured as set forth in ASTM C 926 and Table 2512.6.
|COAT||MINIMUM PERIOD MOIST CURING||MINIMUM INTERVAL BETWEEN COATS|
|First||48 hoursa||48 hoursb|
|Second||48 hours||7 daysc|