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.

SECTION 09350 — CEMENTITIOUS BACKER UNIT


PART 1 — GENERAL

1.01 DESCRIPTION

Extent of Cementitious Backer Units (CBU) will be used as backing for all tile at shower room walls as shown on the Drawings.

1.02 STANDARDS

Follow the current edition of the Tile Council of America's Handbook for Installation.


PART 2 — PRODUCTS

2.01 CEMENTITIOUS BACKER UNITS

Manufacturer: "Durock ®" by United States Gypsum, "Wonder-Board"® by Modulars, Inc., or other manufacturers' product complying with ANSI 118.9.

2.02 TAPE

2" Glass Fiber Mesh Tape

2.03 MORTAR

Latex-Portland Cement Mortar, ANSI A118.4
If air quality is a particular concern, use mortars without latex additives.


PART 3 — EXECUTION

3.01 INSTALLATION

Comply with manufacturer's requirements for each application, and TCA Handbook:
Walls: W244
Floors: F144

Align all edges over framing or solid blocking. Fasten units with screws 6" o.c. along edges and throughout its center. Bed fiberglass tape in mortar at all joints.

END OF SECTION 09350

CEMENTITIOUS BACKER UNIT 09350-#
courtesy of Design Coalition, Architects. , Madison, Wisconsin, USA ~~ www.designcoalition.org