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or in remodeling unless applied directly to studs. Panels should not be installed over a vapor retarder or on a wall acting as a vapor retarder unless it will not be tiled or finished with an impervious paint. Panels are not intended for use in areas subject to constant moisture such as tub and shower enclosures, gang showers and commercial food processing; DUROCK Cement Boards are recommended for these uses.


  • 5.

    Liner boards:

    • 1.

      Type SLX.

    • 2.

      Edges: Beveled.

    • 3.

      Thickness: 1 inch.

    • 4.

      Acceptable product: Equivalent to Gypsum Liner

Panels by USG.

  • 6.

    Cement Backer Board:

  • 1.

    Aggregated portland cement board with woven glass

fiber mesh facing complying with ANSI A118.9.

  • 2.

    Thickness: ½ [5/8] inch.

  • 3.

    Acceptable product and manufacturer: DUROCK

Cement Board by USG.


DUROCK Cement Board is vapor permeable and does not deteriorate in the presence of water. It is used as a substrate for tile or veneer plaster. If a vapor retarder or waterproof construction is specified, a separate barrier must be applied over or behind the DUROCK Board.

IMPERIAL Finish Plaster applied over DIAMOND Veneer Basecoat Plaster can be applied over DUROCK Cement Board to provide a high-impact resistant wall. DUROCK and joint treatment must receive USG Plastic Bonder before application of basecoat plaster.


  • 7.

    Veneer Plaster Partitions:

  • 1.

    Base: Manufacturer's standard size gypsum base

sheets in maximum available lengths to minimize end-to- end joints; manufacturer's standard edge profile.

  • 1.

    Comply with ASTM C588.

  • 2.

    Type X fire-resistant type.

  • 3.

    Thickness: 5/8 [½] inch, unless otherwise


4. Acceptable product: IMPERIAL Gypsum Base by USG.

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