required in some circumstances.
For shed roofs, underlayment may be omitted.
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[2.5.1
Felt Underlayment
Felt underlayment shall be No. 30 felt in compliance with ASTM D 226, Type
II.
][2.5.2
Self-Adhering Modified Bitumen Underlayment
Self-adhering modified bitumen membrane underlayment material in compliance
with ASTM D 1970, and suitable for use as underlayment for metal roofing.
Membrane resistant to cyclical elevated temperatures for extended period of
time shall be used in high heat service conditions. Membrane shall have
integral non-tacking top surface of polyethylene film or other surface
material to serve as separator between bituminous material and metal
products to be applied above.
][2.5.3
EPDM Membrane
Ethylene Propylene Diene Terpolymer (EPDM), ASTM D 4637, Type I,
non-reinforced, minimum 1.1 mm (0.045 inch) thick.
][2.5.4
Slip Sheet
Slip Sheet shall be 0.24 kg per square meter (5 pounds per 100 sf) rosin
sized unsaturated building paper.
]2.6
SEALANT
Sealant shall be an elastomeric type containing no oil or asphalt, as
recommended by the roof panel manufacturer. Silicone based sealants are
prohibited, unless approved otherwise by the roof panel manufacturer and
the Contracting Officer. Exposed sealant shall be [colored to match
adjacent components] [clear] and shall cure to a rubberlike consistency.
Concealed sealant shall be non-hardening type. [Sealant placed in the roof
panel standing seam ribs shall be provided in accordance with the
manufacturer's recommendations.]
2.7
GASKETS AND INSULATING COMPOUNDS
Gaskets and insulating compounds shall be nonabsorptive and suitable for
insulating contact points of incompatible materials. Insulating compounds
shall be nonrunning after drying.
[2.8
INSULATION
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NOTE: Include this paragraph only when the
non-structural roof system assembly incorporates
insulation above the roof deck or directly in
contact with the roof panels. Coordinate with the
appropriate insulation specification section.
Vapor retarder design shall also be coordinated with
the insulation requirements and specified in the
insulation section.
SECTION 07412
Page 21
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