3.1.6
Blocking
Provide blocking when mounting equipment. Cut[ metal][ or][ wood] blocking
to fit in between the framing members. Rigidly anchor blocking to the
framing members. Under no circumstances will accessories or other wall
mounted equipment be anchored directly to the veneer plaster system.
3.2
APPLICATION OF GYPSUM BASE
Apply gypsum base and gypsum backing board to framing and furring members
in accordance with ASTM C 844 and the requirements specified herein. Gypsum
wallboard may be used for the base ply in two-ply construction. Provide
gypsum base and backing board of maximum practical length, using full
length boards for vertical application. Install separate boards in
moderate contact without forcing in place. Install boards tight against
the framing so as to eliminate any offset in the face plane between
adjoining boards. Stagger end joints of adjoining boards. Fit abutting
end and edge joints. Cut boards as required to make close joints around
openings. Gypsum base may be adhered to gypsum backing board with an
adhesive, except where prohibited by fire rating. In multi-layer
construction, offset joints between layers. Offset joints on opposite
faces of the partition.
3.2.1
Curved Surfaces
Use bending radii in accordance with ASTM C 844, TABLE 5. Bend gypsum base
into place without damaging the face paper. If the base is dampened to
facilitate bending, dry thoroughly, and apply a bonding agent (ASTM C 631)
before plastering.
3.2.2
Cavity Shaftwall System
Install gypsum backing boards, core boards, and gypsum base in accordance
with the shaftwall system manufacturer's printed recommendations to achieve
the fire rating required.
3.2.3
Control Joints
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NOTE: Control joint locations should be shown on
the drawings. Control joint spacing in walls or
wall furring shall not exceed 9000 mm 30 feet.
Control joint spacing shall not exceed 9000 mm 30
feet in either direction in restrained ceilings, and
15000 mm 50 feet in either direction in ceilings
with perimeter relief. Joints should be provided at
the wings of L, U, and T shaped ceiling areas.
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Control joints in ceilings and walls shall be one piece manufactured
products designed for use with a veneer plaster system.
3.2.4
Vapor Retarder
Install foil-backed gypsum base or gypsum backing board with the reflective
surface against the framing members. Install polyethylene vapor retarder
with joints over framing members, and with joints lapped the full width of
the framing members.
SECTION 09215
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