spacing to provide a suitable substrate to receive gypsum board and
cementitious backer units. Verify that all blocking, headers and supports
are in place to support plumbing fixtures and to receive soap dishes, grab
bars, towel racks, and similar items. Do not proceed with work until
framing and furring are acceptable for application of gypsum board and
cementitious backer units.
3.1.2
[Gypsum Board] [and] [Framing]
Verify that surfaces of [gypsum board] [and] [framing] to be bonded with an
adhesive are free of dust, dirt, grease, and any other foreign matter. Do
not proceed with work until surfaces are acceptable for application of
gypsum board with adhesive.
3.1.3
[Masonry] [and] [Concrete] Walls
Verify that surfaces of [masonry] [and] [concrete] walls to receive gypsum
board applied with adhesive are dry, free of dust, oil, form release
agents, protrusions and voids, and any other foreign matter. Do not
proceed with work until surfaces are acceptable for application of gypsum
board with adhesive.
3.2
APPLICATION OF GYPSUM BOARD
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NOTE: Coordinate with the drawings to ensure that
all types of gypsum board specified are indicated.
Terminology on the drawings should be identical to
that in the specifications.
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Apply gypsum board to framing and furring members in accordance with ASTM C
840 or GA 216 and the requirements specified herein. Apply gypsum board
with separate panels in moderate contact; do not force in place. Stagger
end joints of adjoining panels. Neatly fit abutting end and edge joints.
Use gypsum board of maximum practical length. Cut out gypsum board as
required to make neat close joints around openings. In vertical
application of gypsum board, provide panels in lengths required to reach
full height of vertical surfaces in one continuous piece. Surfaces of
gypsum board and substrate members may be bonded together with an adhesive,
except where prohibited by fire rating(s). Treat edges of cutouts for
plumbing pipes, screwheads, and joints with water-resistant compound as
recommended by the gypsum board manufacturer. Provide type of gypsum board
for use in each system specified herein as indicated.
3.2.1
Application of Single-Ply Gypsum Board to Wood Framing
Apply in accordance with ASTM C 840, System I or GA 216.
3.2.2
Application of Two-Ply Gypsum Board to Wood Framing
Apply in accordance with ASTM C 840, System II or GA 216.
3.2.3
Adhesive Nail-On Application to Wood Framing
Apply in accordance with ASTM C 840, System III or GA 216. This method may
be used in lieu of ASTM C 840, System I at the option of the Contractor.
SECTION 09250
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