09260-sheetrock.doc

SECTION 09260-GYPSUM BOARD

PART 1 ‑ PRODUCTS

1.1

MANUFACTURERS

A.

Available Manufacturers: Subject to compliance with requirements, manufacturers offering products which may be incorporated in the Work include the following or approved equal:

1.

Gypsum Boards and Related Products:

a.

Georgia‑Pacific Corp.

b.

Gold Bond Building Products Div., National Gypsum Co.

c.

United States Gypsum Co.

1.2

GYPSUM BOARD

A.

General: Provide gypsum board of types indicated in maximum lengths available to minimize end‑to‑end joints.

B.

Gypsum Wallboard: ASTM C 36, and as follows:

Type: Regular, unless otherwise indicated.

2.

Type: Type X for fire‑resistance‑rated assemblies.

3.

Edges: Tapered.

4.

Thickness: 5/8", unless otherwise indicated.

C.

Water-Resistant Gypsum Board (“Green Board”): ASTM C 630, and as follows:

Type: Regular, unless otherwise indicated.

Type: Type X for fire‑resistance‑rated assemblies.

Edges: Tapered.

Thickness: 5/8", unless otherwise indicated.

1.3

GLASS MESH MORTAR UNITS

Proprietary backing units with glass mesh fiber mesh reinforcing and water resistant coating on both faces, complying with either of the following requirements:

Cement‑Coated Portland Cement Panels: High density portland cement surface coating on both faces and lightweight concrete core composed of portland cement and expanded ceramic aggregate; fabricated in panels 7/16 inch thick by 36 inches wide by 36, 48, or 60, 64, or 72 inches long; and weighing 3.2 ‑ 3.8 lbs per sq. ft.

Vinyl‑Coated Portland Cement Panels: Core formed in a continuous process from aggregated portland cement slurry and reinforced with vinyl‑coated woven glass fiber mesh embedded in both surfaces, with one face smooth and other textured; fabricated in panels 1/2 inch thick and by 36 inches wide by 48, 60, and 72 inches long; and weighing 3 lbs per sq. ft.

B.

Available Products: Subject to compliance with requirements, glass mesh mortar units which may be incorporated in the work include, but are limited to, the following:

"Wonder‑Board"; Modulars Inc.

"Durock Tile Backer Board"; Durabond Div., USG Industries, Inc.

1.4

TRIM ACCESSORIES

Cornerbead and Edge Trim for Interior Installation: Provide corner beads, edge trim and control joints which comply with ASTM C 1047 and requirements indicated below:

Material: Formed metal, plastic or metal combined with paper, with metal complying with the following requirement:

Sheet steel zinc‑coated by hot‑dip process.

Edge trim shapes indicated below by reference to designations of Fig. 1 in ASTM C 1047:

"LC Bead", unless otherwise indicated.

b.

"L" Bead where indicated.

c.

"U" Bead where indicated.

1.5

GYPSUM BOARD JOINT TREATMENT MATERIALS

A.

General: Provide materials complying with ASTM C 475, ASTM C 840, and recommendations of manufacturer of both gypsum board and joint treatment materials for the application indicated.

B.

Joint Tape: Paper reinforcing tape, unless otherwise indicated.

C.

Setting‑Type Joint Compounds: Factory‑prepackaged, job‑mixed, chemical‑hardening powder products formulated for uses indicated.

Where setting‑type joint compounds are indicated for use as taping and topping compounds, use formulation for each which develops greatest bond strength and crack resistance and is compatible with other joint compounds applied over it.

For pre-filling gypsum board joints, use formulation recommended by gypsum board manufacturer for this purpose.

For filling joints and treating fasteners of water‑resistant gypsum backing board behind base for ceramic tile, use formulation recommended by gypsum board manufacturer for this purpose.

D.

Drying‑Type Joint Compounds: Factory‑prepackaged vinyl‑based products complying with the following requirements for formulation and intended use.

Ready‑Mix Formulation: Factory‑premixed product.

Taping compound formulated for embedding tape and for first coat over fasteners and flanges of corner beads and edge trim.

Topping compound formulated for fill (second) and finish (third) coats.

All‑purpose compound formulated for use as both taping and topping compound.

1.6

MISCELLANEOUS MATERIALS

A.

General: Provide auxiliary materials for gypsum drywall construction which comply with referenced standards and the recommendations of the manufacturer of the gypsum board.

B.

Gypsum Board Nails: ASTM C 514.

C.

Asphalt Felt: ASTM D 226, Type I (No. 15).

D.

Concealed Acoustical Sealant: Nondrying, non-hardening, non-skinning, non-staining, non-bleeding, gunnable sealant complying with requirement specified in Division‑7 section "Joint Sealers."

E.

Sound Attenuation Blankets: Unfaced mineral fiber blanket insulation produced by combining mineral fibers of type described below with thermosetting resins to comply with ASTM C 665 for Type I (blankets without membrane facing); and as follows:

Mineral Fiber Type: Fibers manufactured from glass or slag.

1.7

GLASS MESH MORTAR UNIT FINISHING MATERIALS

A.

Tape and joint compounds as recommended by glass mesh mortar unit manufacturer.

END OF SECTION 09260

GYPSUM BOARD SYSTEMS

09260‑