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[Provide either closed cut, woven, open roll roofing, or open sheet metal
valleys.]
3.3.6.1
Closed Cut Valleys
Provide 900 mm 36 inch wide valley lining of single layer of
smooth-surfaced or mineral-surfaced roll roofing, with mineral-surface
facing down, for full length of valley as follows:
a.
Center lining in valley over underlayment. Provide minimum 300 mm
12 inch end laps in the lining and seal laps with asphalt roof
cement. Fasten lining to hold it in place until shingles are
applied.
b.
Apply first regular course of shingles along eaves of one of the
intersecting roof planes and across valley. Extend course at
least 300 mm 12 inches onto adjoining roof.
c.
Apply succeeding courses in same manner as first course, extending
across valley and onto adjoining roof.
d.
Press shingles tightly into valley and nail in normal manner,
except apply nails not closer than 150 mm 6 inches to valley
centerline, and apply additional nail in top corner of each
shingle crossing valley.
e.
Apply shingles on the adjoining roof plane, starting along eaves
and across valley onto previously applied shingles. Trim
overlapping courses back to a line parallel to and a minimum of 50
mm 2 inches back from valley centerline.
f.
Trim 25 mm one inch on a 45 degree angle from upper corner of each
end shingle. Embed end shingles in a 75 mm 3 inch wide band of
asphalt roof cement.
3.3.6.2
Woven Valleys
Provide valley lining as specified for closed cut valley.
Lay valley
shingles over lining by either of the following methods:
a.
Method I: Apply regular shingles on both roofs simultaneously.
Weave each course in turn over the valley. Lay the first regular
course of shingles along eaves of roof up to and over valley.
Extend course along adjoining roof deck at least 300 mm 12 inches.
Carry first regular course of shingles of adjoining roof over
valley on top of previously applied shingles. Lay succeeding
courses alternately, weaving valley shingles over each other for
full length of valley.
b.
Method II: Apply regular shingles on each roof surface separately
to a line about 900 mm 3 feet from center of valley, and weave
valley shingles in place later, as specified for Method I.
In following either method, press shingles tightly into valley, and fasten
in normal manner; except apply nails not closer than 150 mm 6 inches to
valley centerline, and apply additional nail in top corner of terminal
shingle on both sides of valley.
SECTION 07311
Page 13
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