[3.3.11
Vapor Pressure Relief Vents
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NOTE: Include this paragraph only where vapor
pressure relief venting over wet fill substrate
material or insulation over vapor retarder is
required. Coordinate with venting provisions in
other paragraphs of this specification.
**************************************************************************
Provide vents in a uniform pattern and at a minimum rate of one for each
100 square meters (1000 square feet) of roof area. Space and install in
strict accordance with manufacturer's instructions. Cut a hole, of
diameter to suit base opening size of vent, through the roofing membrane
and down to the deck[vapor retarder] surface. Fill the cut out with loose
fill fiberglass or crumbled polyisocyanurate insulation. Set vent flange
over hole on top of roofing membrane in a 1/8 inch thick bed of modified
bitumen roof cement or special adhesive or cement recommended by vent
manufacturer. Strip-in vent flanges with strip flashing membrane and
provide bead of modified bitumen sealant at membrane termination at base of
vent.
][3.3.12
Field Applied Surfacing
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NOTE: Delete "Field Applied Surfacing" and
associated paragraphs if factory-applied granule
surfaced membrane is specified. Otherwise, include
only the applicable surfacing, delete all others.
**************************************************************************
After completion of roof membrane and flashing installation, and correction
of tears, gouges, and other deficiencies in the installed work, apply
specified surfacing.
[3.3.12.1
Aggregate
Uniformly flood coat the surface with hot asphalt at a rate of approximate
2.9 kg (60 pounds) per square. While asphalt is still hot, apply gravel
aggregate surfacing material at a rate of 19.5 kg (400 pounds) per square
or 14.5 kg (300 pounds) per square for slag or other approved aggregate
surfacing. Provide for full and uniform coverage of the roof surface.
Approximately 50 percent of the aggregate shall be solidly adhered in the
asphalt.
][3.3.12.2
Coating Application
Apply surface coating materials to membrane and flashing in accordance with
coating material manufacturer's recommendations.
]]3.3.13
Correction of Deficiencies
Where any form of deficiency is found, additional measures shall be taken
as deemed necessary by the Contracting Officer to determine the extent of
the deficiency and corrective actions shall be as directed by the
Contracting Officer.
SECTION 07550
Page 33
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