gypsum sheathing panels shall be butted snugly with vertical joints
staggered to provide full and even support for the moisture barrier. Holes
and gaps resulting from abandoned screw installations, from damage to
panels, and from cutting and fitting of panels at junctures with doors,
windows, foundation walls, floor slabs and other similar locations shall be
filled with exterior rubber-base caulk.
3.7
MOISTURE PROTECTION
3.7.1
Moisture Barrier
The asphalt-saturated felt or other approved moisture barrier shall be
installed on the outer face of the exterior sheathing. The moisture
barrier shall be installed horizontally and shingled with each sheet lapped
not less than 150 mm 6 inches over the sheet below. Vertical end joints
shall be lapped not less than 150 mm 6 inches and shall be staggered.
Attachment of the moisture barrier shall be with staples spaced not greater
than 400 mm 16 inches on center or as required by the manufacturer.
3.7.2
Vapor Retarder
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NOTE: The purpose of the vapor retarder is to keep
the wall insulation dry. So, the vapor retarder
should be installed on the side of the insulation
where the greatest concern about moisture
infiltration into the insulation exists. In colder
regions, where moisture from heated inside air is
the major concern, the retarder should be placed
inside the insulation. In warm and humid regions,
where moisture from outside air is the major
concern, the retarder should be placed outside the
insulation. Vapor retarders should never be
installed on both sides of the insulation.
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A vapor retarder shall be installed [between the steel studs and the gypsum
wall board] [between the steel studs and the exterior sheathing]. The
vapor retarder shall be installed in accordance with the manufacturer's
recommendations to form a complete retarder to vapor infiltration. The
joints shall be lapped and sealed with tape.
3.8
VENEER ANCHORS
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NOTE: If special anchors are required by the
design, their installation requirements will be
specified to meet the necessary special conditions.
The wire should lie between 16 mm (5/8 inch) from
each face of the veneer for solid unit masonry.
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Veneer anchors shall be attached with screws through the sheathing and
rigid insulation to the steel studs or other support members at the
locations shown. When rigid insulation is used, the method of connecting
the veneer anchor through the insulation shall be approved by the
Contracting Officer. Veneer anchors shall be installed with the outermost
wires lying between 16 mm 5/8 inch from each face of the masonry veneer.
SECTION 04810
Page 21
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