acceptable to the roof membrane manufacturer and meeting specified
requirements. Materials provided shall be free of defects and suitable for
the service and climatic conditions of the installation.
2.1.1
EPDM Sheet
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NOTE: Refer to Designer Note in PART 1 -
DESCRIPTION OF ROOF MEMBRANE SYSTEM for guidance
regarding membrane attachment method and in editing
the membrane materials requirements.
Specify 1.1 mm (0.045 inch) Type II reinforced
membrane for mechanically fastened applications in
wind zones exceeding 160 km/h (100 mph), within 8 km
(5 miles) of coastline or within 457 m (1500 feet)
of open body of water.
Typically specify 1.5 mm (0.060 inch) Type II
non-reinforced membrane for fully adhered or
ballasted application, except that 1.1 mm (0.045
inch) Type III membrane with fleece-backing may be
used in fully adhered installations. When Type III
membrane is required the adhesive is typically a
spray applied compound, spray foam adhesive, or hot
asphalt. Related portions of this specification
shall be modified for proper adhesive and
application parameters when Type III membrane is
specified.
2.3 mm (0.090 inch) membrane is a special material
with limited availability. Specify 2.3 mm (0.090
inch) membrane only for applications that experience
regular heavy traffic conditions or regular extreme
wind conditions. 2.3 mm (0.090 inch) membrane shall
only be fully adhered.
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Ethylene Propylene Diene Terpolymer (EPDM), ASTM D 4637, [Type I,
non-reinforced][Type II, scrim or fabric reinforced][Type III, fabric or
fleece backed], [1.1 mm (0.045 inch)][1.5 mm (0.060 inch)][2.3 mm (0.090
inch)] nominal thickness for [mechanically fastened] [fully adhered]
[loose-laid ballasted] [combined fully adhered and mechanically fastened]
application. Minimum thickness shall not be less than minus 10 percent of
the specified thickness value. EPDM membrane thickness specified is
exclusive of backing material on the EPDM membrane. Principal polymer used
in manufacture of the membrane sheet shall be greater than 95 percent EPDM.
Width and length of sheet shall be [as recommended by the
manufacturer.][maximum width attainable as recommended by the manufacturer
to minimize field formed seams in the field of the roof.]
2.1.2
Seam Tape
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NOTE: Seam tapes have proven most effective in
maintaining long term seal of field seams of roof
membrane. Seam tapes can be difficult to apply to
membrane flashing situations. As such, lap splice
adhesive or self-adhering flashing membrane are used
SECTION 07530
Page 14
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