following.
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NOTE: Where the average daily January temperature is
minus 4 degrees C 25 degrees F or below or where
there is the chance of ice dams forming along the
eaves, use the second optional paragraph instead of
the first optional paragraph. In areas where the
architect/engineer has determined that eave flashing
is not commonly provided, do not include either
paragraph.
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[Provide for roof slopes one in 3 4 inches per foot and greater. Provide
eave flashing strips consisting of smooth-surfaced roll roofing. Flashing
strips shall overhang metal drip edge 6 to 10 mm 1/4 inch to 3/8 inch and
extend up the slope far enough to cover a point 300 mm 12 inches inside
interior face of exterior wall. Where overhangs require flashings wider
than 900 mm 36 inches, locate laps outside exterior wall face. Laps shall
be at least 50 mm 2 inches wide and cemented with asphalt roof cement over
entire length of lap. Lap end 300 mm 12 inches and cement.]
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NOTE: The requirements below are intended primarily
for roof slopes between one in 6 and one in 3 2 and
4 inches per foot. They should not be specified for
roof slopes one in 3 4 inches per foot and greater
unless the condition of note above is met.
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[Provide for roof slopes [between one in 6 and one in 3 2 inches per foot
and 4 inches per foot] [one in 34 inches per foot and greater]. Provide
either of the following types of eave flashing:
a.
From the eaves to a point 600 mm 24 inches inside interior wall
line, apply solid coating of asphalt roof cement between
overlapping layers of underlayment. Spread cement to a uniform
thickness at rate of 7.5 liters per 10 square meters 2 gallons per
100 square feet of cemented roof area.
b.
From the eaves to a point 600 mm 24 inches inside interior wall
line, apply one layer of self-adhering membrane. Follow membrane
manufacturer's printed installation instructions.]
3.3.7.2
Stepped Flashing
For sloping roofs which abut vertical surfaces, provide stepped metal
flashing as specified in Section 07600 FLASHING AND SHEET METAL.
3.3.7.3
Vent and Stack Flashing
Apply shingles up to point where vent or stack pipe projects through roof,
and cut nearest shingle to fit around pipe. Before applying shingles
beyond pipe, prepare flange of metal pipe vent flashing as specified in
Section 07600 FLASHING AND SHEET METAL, by applying a 3 mm 1/8 inch thick
coating of asphalt roof cement on bottom side of flashing flange. Slip
flashing collar and flange over pipe, and set coated flange in 2 mm 1/16
inch coating of asphalt roof cement. After applying flashing flange,
SECTION 07311
Page 15
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