The work of this Section is one of the largest sources of construction waste on the normal building site. There is very good potential for recycling this waste as markets develop. Check for recycling options and regulations as time goes on.
It seems that reducing time of installation (labor costs) overrides efficient use of off cuts.
SECTION 09250 — GYPSUM WALL BOARD
PART 1 — GENERAL
1.01 DESCRIPTION
Extent of gypsum drywall (GWB) work is shown on drawings and includes gypsum drywall and joint treatment products on all wall and ceiling surfaces including accessories for installation and trimming.
1.02 STANDARDS
Comply with ASTM C 840 - Specification for Application and Finishing of Gypsum Board and GA 216 - Recommended Specifications for the Application and Finishing of Gypsum Board.
1.03 DELIVERY, STORAGE, AND HANDLING
Have materials shipped in manufacturer's original packages showing manufacturer's name and product brand name. Store materials inside and protected from damage by the elements. Protect ends, edges, and faces of gypsum boards from damage.
1.04 WASTE MANAGEMENT
Separate clean waste gypsum products from contaminants for recycling. Do not include wood, plastic, metal, asphalt impregnated gypsum board or any gypsum board coated with glass fiber, vinyl, decorative paper, or other finish. Place in designated area and protect from moisture and contamination.
Clean waste gypsum products are to be recycled by:
Edit to suit project and location.
Hauling to gypsum board manufacturer in lieu of landfill.
Hauling to alternative use manufacturer in lieu of landfill.
Pulverizing and applying on-site as soil amendment in accordance with landscape specifications. Protect granular material from moisture.
PART 2 — PRODUCTS
2.01 GYPSUM WALL BOARDS
Most manufactures use recycled paper in the covering of GWB and use byproduct flyash for the gypsum. Gyproc® GWB by Domtar is made of byproduct gypsum and some recycled scrap GWB.
In selecting GWB preference will be given to products with recycled content.
A reinforced gypsum wallboard sheathing with recycled paper content is FiberBond. Use 5/8" for fire rated construction. Being a reinforced product, it is also stiffer, more sag resistant, and with greater screw and nail withdrawal resistant. It is about twice as expensive as unreinforced gypsum sheathing.
FiberBond® fiber reinforced gypsum wallboard [1/2"][5/8"] by Louisiana-Pacific Corp., Portland, OR.
Edit as necessary for the job…
Regular Gypsum Board: A gypsum core wall panel surfaced with paper on front, back, and long edges standard taper and complying with ASTM C 36. Provide [1/2"][5/8"] thickness.
Fire-Rated Gypsum Board: A gypsum core wall panel with additives to enhance fire resistance of the core and surfaced with paper on front, back, and long edges standard taper and complying with ASTM C 36, Type X. Provide 5/8" thickness.
Water-Resistant Gypsum Backing Board: A gypsum core wall panel with additives to enhance the water resistance of the core; surfaced with water repellent paper on front, back, and long edges standard taper; and complying with ASTM C 630. Provide [1/2"][5/8"] thickness.
Fire-Rated Water-Resistant Gypsum Backing Board: A gypsum core wall panel with additives to enhance the fire resistance of the core and the water resistance of the core; surfaced with water repellent paper on front, back, and long edges; and complying with ASTM C 630, Type X. Thickness: 5/8" thickness.
Gypsum Ceiling Board: A gypsum core ceiling panel with additives to enhance the sag resistance of the core and surfaced with paper on front, back, and long edges. Thickness: 5/8" thickness.
As a backer for ceramic tile, CBU is preferred. Moisture resistant GWB should not be used. However, Georgia-Pacific's Dens-Shield®, a gypsum board with a water resistant coating and a silicone-treated core is a less expensive alternative. It is also lighter and easier to handle, but its warranty is only 20 years.
Tile Backer: Dens-Shield® [1/2"][5/8"] thickness by Georgia-Pacific, 133 Peachtree St. N.E., Atlanta, GA 30303, (800) 225-6119.
2.02 TRIM ACCESSORIES
Provide manufacturer's standard metal trim accessories, of the beaded type with face flanges for concealment in joint compound except where semi-finishing or exposed type is indicated. Provide corner beads, and casing beads where drywall is placed adjacent to concrete, masonry or finished wood surfaces.
2.03 FASTENERS
Provide type with heads, lengths, threads, points, and finish as recommended by manufacturer as required.
2.04 JOINT SYSTEM
Joint compounds contain formaldehyde and other VOCs. Allow thorough drying to volatilize before painting.
Joint Tape: ASTM C 475 ready-mixed vinyl type for interior work.
Joint Compound: Use asbestos-free compounds.
Acceptable manufacturers:
Murco M-100 HiPo by Murco Wall Products, Inc. Fort Worth, TX.
AFM Joint Compound by AFM Enterprises, 350 Ash St. Suite 700, San Diego CA 92101-3404, (619) 239-0321.
Auro Joint Cement by Sinan Co., P.O.Box 857, Davis, CA 95617 (916) 753 3104.
PART 3 — EXECUTION
3.01 WASTE MANAGEMENT
Keep waste gypsum products clean from contaminants for recycling. Separate from wood, plastic, metal, asphalt impregnated gypsum board or any gypsum board coated with glass fiber, vinyl, decorative paper, or other finish. Place in designated areas and protect from moisture and contamination.
Edit to suit project and location.
Clean waste gypsum products are to be recycled by:
• Hauling to gypsum board manufacturer in lieu of landfill.
• Hauling to alternative use manufacturer in lieu of landfill.
• Pulverizing and applying on-site as soil amendment in accordance with landscape specifications. Protect granular material from moisture.
Separate metal waste and place in designated areas for recycling or reuse.
3.02 INSTALLATION
Screw gypsum wall board to wood supports following manufacturer's recommendations.
Install gypsum boards in lengths and directions which will minimize the number of end joints, and avoid end joints in central areas of ceilings. Install walls and partitions with exposed gypsum boards vertical, with joints offset on opposite sides of partitions.
Otherwise, install boards with edges perpendicular to supports, with end joints staggered over supports, except where otherwise recommended by manufacturer.
Form "floating" construction for gypsum boards at internal corners, except where special edge trim is indicated or fire ratings are required.
Isolate drywall work from abutting structural and masonry work: Provide edge trim and acoustical sealant as recommended by manufacturer.
3.03 FINISHING
Except as otherwise indicated, apply joint tape and joint compound at joints (both directions) between gypsum boards. Apply compound at accessory flanges, penetrations, fastener heads and surface defects.
Install compound in three coats (plus prefill of cracks where recommended by manufacturer); sand after last 2 coats.
Use only high-velocity air dryers to dry joint compound. Avoid using kerosene or gas heaters.
END OF SECTION 09250
GYPSUM WALL BOARD 09250-#
courtesy of Design Coalition, Architects. , Madison, Wisconsin, USA ~~ www.designcoalition.org