concealed side of exposed edges. Exposed surfaces shall be formed flat and
free of buckles, waves, and tool marks. Provision shall be made for
thermal expansion and contraction. Seams shall be uniform and neat with
minimum of solder, welds and sealant. Fasteners and expansion provisions
shall be concealed where possible in exposed work. Field-cutting of panels
by torch is not permitted.
3.1.1
Tolerances
Panels shall be shimmed and aligned within a tolerance of 9 mm in 12 meters
3/8 inch in 40 feet vertically and horizontally and within 3 mm 1/8 inch
offset of adjoining surfaces and of vertical alignment of matching profiles.
3.1.2
Substrates
Concrete substrates shall be made smooth with a wash of neat cement or with
a heavy application of bituminous coating. If concrete is not nailable,
nailable inserts shall be set into the concrete. Substrates shall be
clean, smooth, sound, dry, and free of defects and projections which might
affect the installation. Projecting nails and other types of fasteners
shall be secure and flush with substrate. Roof openings, pipes, vents, and
other roof penetrations shall be securely set in place.
3.1.3
Vapor Retarder
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NOTE: Delete this paragraph if vapor retarder is
not required. If vapor retarder is required keep
the appropriate brackets for roofing felts or
polyethylene.
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[Roofing felts shall be installed in accordance with manufacturer's
recommendations.] [A single ply of 0.254 mm 10 mil polyethylene sheet or,
at the Contractor's option, a double ply of 0.152 mm 6 mil polyethylene
sheet shall be installed over the entire support surface. Tape shall be
used to seal the edges of the sheets to the support surface, or to the
sheet below. Sheet edges shall be lapped not less than 150 mm 6 inches.
Sufficient material shall be provided to avoid inducing stresses in the
sheets due to stretching or binding. All tears or punctures that are
visible in the finished surface at any time during the construction process
shall be sealed with the tape.]
3.1.4
Slip Sheets
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NOTE: Slip sheets are required for all
installations. Slip sheets must be installed over
vapor retarder when vapor retarder is specified.
**************************************************************************
Slip sheets shall be installed with joints overlapped a minimum of 50 mm 2
inches, and shall be secured with approved fasteners.
3.2
FIELD TESTING
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NOTE: Field testing may not be required for all
projects. Delete if not required.
SECTION 07610
Page 10
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