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instructions, for both vertical (shaft enclosure) and horizontal (duct enclosure) applications.

  • 3.

    Seal perimeters and openings to provide airtight installation.

  • 4.

    Install sloped gypsum board cants on hoistway side of shaftwall where

slabs or beams project beyond shaftwall.

  • 5.

    VENEER PLASTER INSTALLATION

    • 1.

      Base:

    • 1.

      Install gypsum base in accordance with ASTM C844. Apply gypsum

base with face side out.

2. Butt and fit abutting edges and ends together for light contact; do not force into place.

3. Do not locate fasteners closer than 3/8 inch from ends or edges of sheets. Set heads slightly below surface of gypsum base, but do not break paper face.

    • 4.

      Drive screws with power screwdriver.

  • 2.

    Single Layer Applications:

    • 1.

      Position edges over support flanges.

    • 2.

      To maintain true surface plane for installation on studs, arrange

direction of application so that leading edge of base is attached first to open edge of stud flange.

  • 3.

    Double Layer Applications:

  • 1.

    Apply gypsum base layer and face layer with long dimension parallel

to supports. Offset joints of face layer from base layer joints.

  • 2.

    Fasten both base and face layers separately to supports.

  • 3.

    Stagger and space fasteners in accordance with gypsum base

manufacturer's instructions.

  • 6.

    ACCESSORY INSTALLATION

    • 1.

      Trim:

    • 1.

      Use same fasteners to anchor trim accessory flanges as required to

fasten gypsum board to supports, unless otherwise recommended by trim manufacturer.

  • 2.

    Install metal corner beads at external corners.

  • 3.

    Install metal casing bead trim whenever edge of gypsum board would

otherwise be exposed or semi-exposed.

2. Control Joints:

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