NOTE: Roof deck should not be assumed to function
as a vapor retarder.
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Vapor retarder material shall be polyethylene sheeting conforming to ASTM D
4397. A single ply of 0.25 mm 10 mil polyethylene sheet; or, at the
Contractor's option, a double ply of 0.15 mm 6 mil polyethylene sheet shall
be used. A fully compatible polyethylene tape which has equal or better
water vapor control characteristics than the vapor retarder material shall
be provided. A cloth industrial duct tape in a utility grade shall also be
provided to use as needed to protect the vapor retarder from puncturing.
2.11.3
Slip Sheet for Use With Vapor Retarder
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NOTE: A slip sheet is required to separate the
roofing panels from the insulation facing where the
facing would be in direct contact with the roofing
panels.
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Slip sheet for use with vapor retarder shall be a 0.24 kg per square meter
5 lb. per 100 square feet rosin-sized, unsaturated building paper.
2.12
EPDM RUBBER BOOTS
Flashing devices around pipe penetrations shall be flexible, one-piece
devices molded from weather-resistant EPDM rubber. Rubber boot material
shall be as recommended by the manufacturer. The boots shall have base
rings made of aluminum or corrosion resisting steel that conform to the
contours of the roof panel to form a weather-tight seal.
2.13
PREFABRICATED CURBS AND EQUIPMENT SUPPORTS
Prefabricated curbs and equipment supports shall be of structural quality,
hot-dipped galvanized or galvanized sheet steel, factory primed and
prepared for painting with mitered and welded joints. Integral base plates
and water diverter crickets shall be provided. Minimum height of curb
shall be 200 mm 8 inches above finish roof. Curbs shall be constructed to
match roof slope and to provide a level top surface for mounting of
equipment. Curb flange shall be constructed to match configuration of roof
panels. Curb size shall be coordinated, prior to curb fabrication, with
the mechanical equipment to be supported. Strength requirements for
equipment supports shall be coordinated to include all anticipated loads.
Flashings shall not be rigidly attached to underline structure.
PART 3
EXECUTION
3.1
INSTALLATION
Installation shall be in accordance with the manufacturer's erection
instructions and drawings. Dissimilar materials which are not compatible
when contacting each other shall be insulated by means of gaskets or
insulating compounds. Molded closure strips shall be installed wherever
roofing sheets terminate in open-end configurations, exclusive of
flashings. The closure strip installation shall be weather-tight and
sealed. Screws shall be installed with a clutching screw gun, to assure
screws are not stripped. Field test shall be conducted on each gun prior
to starting installation and periodically thereafter to assure it is
SECTION 07416A
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