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  • 7.

    Screw board in place securely with screws spaced according to manufacturer's recommendations.

  • 2.

    Double Layer Gypsum Board:

1. Fasten base layer to studs or furring with screws, and attach face layer using laminating adhesive and screws, applied according to manufacturer's instructions.

2. Offset face-layer joints at least 10 inches from parallel base-layer joints.

3. Screw both layers to metal supports at double layer ceiling applications and where required for fire-rated construction.

3 Water-Resistant Gypsum Board:

  • 1.

    Complete plumbing rough-in before gypsum board panels are erected.

  • 2.

    Separate gypsum panels from rough-in and fixtures by 1/4 inch space.

  • 3.

    Make necessary cut-outs and seal cut or exposed panel edges with

thinned-down ceramic tile adhesive or with waterproof flexible sealant, as recommended by gypsum board manufacturer.

  • 4.

    Install water-resistant board horizontally.

  • 5.

    Do not place water-resistant board directly over vapor retarder.

  • 6.

    Prior to tile application, fill openings around pipes, fittings, fixtures,

interior angles and other penetrations with waterproof flexible sealant, as recommended by gypsum board manufacturer. Do not fill 1/4 inch gap at bottom of panels.

  • 4.

    Cementitious Backer Board Installation:

  • 1.

    Install as indicated to comply with ANSI A108.11 and in accordance

with manufacturer's instructions.

  • 2.

    Complete plumbing rough-in before boards are erected.

  • 3.

    Separate board from rough-in and fixtures and fill space as

recommended by manufacturer.

    • 4.

      Securely fasten boards to substrate as required.

    • 5.

      Follow manufacturer's instructions for treatment of edge terminations.

    • 6.

      At joints and corners, embed fiberglass tape in skim coat of mortar.

  • 5.

    Gypsum Shaftwall:

    • 1.

      Erect gypsum board shaft liner for use as temporary shaft enclosure.

    • 2.

      Screw attach base and face layers according to manufacturer's

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