and seal.
3.1.21
Conductor Heads
Type indicated and fabricated of the same material as the downspouts. Set
the depth of top opening equal to two-thirds of the width. Provide outlet
tubes not less than 100 mm 4 inches long. Flat-lock solder the seams
except the mechanically fastened aluminum joints filled with a hard setting
sealant. Where conductor heads are used in conjunction with scuppers, set
the conductor a minimum of 50 mm 2 inches wider than the scupper. Attach
conductor heads to the wall with masonry fasteners, and loose-lock to
provide conductor heads with screens of the same material. Securely fasten
screens to the heads.
3.1.22
Splash Pans
Install splash pans where downspouts discharge on roof surfaces and at
other locations as indicated. Unless otherwise shown, provide pans not
less than 600 mm long by 450 mm wide 24 inches long by 18 inches wide with
metal ribs across the bottom of the pan. Form the sides of the pan with
vertical baffles not less than 25 mm one inch high in the front, and 100 mm
4 inches high in the back doubled over and formed continuous with
horizontal roof flanges not less than 100 mm 4 inches wide. Bend the rear
flange of the pan to contour of cant strip and extend up 150 mm 6 inches
under the side wall covering or to height of base flashing under
counterflashing. Bed the pans and roof flanges in plastic bituminous
cement and strip-flash as specified in Roofing Section.
3.1.23
Open Valley Flashing
Provide valley flashing free of longitudinal seams, of width sufficient to
extend not less than 150 mm 6 inches under the roof covering on each side.
Provide a 13 mm 1/2 inch fold on each side of the valley flashing. Lap the
sheets not less than 150 mm 6 inches in the direction of flow and secure to
roofing construction with cleats attached to the fold on each side. Nail
the tops of sheets to roof sheathing. Space the cleats not more than 300 mm
12 inches on centers. Provide exposed flashing not less than 100 mm 4
inches in width at the top and increase 25 mm one inch in width for each
additional 2400 mm 8 feet in length. Where the slope of the valley is one
in 2.67 or less 4.5 inches or less per foot, or the intersecting roofs are
on different slopes, provide an inverted V-joint, 25 mm one inch high,
along the centerline of the valley; and extend the edge of the valley
sheets 200 mm 8 inches under the roof covering on each side. Valley
flashing for asphalt shingle roofs is specified in Section 07311 ASPHALT
SHINGLES.
3.1.24
Eave Flashing
One piece in width, applied in 2400 to 3000 mm 8 to 10 foot lengths with
expansion joints spaced as specified in paragraph entitled "Expansion and
Contraction." Provide a 20 mm 3/4 inch continuous fold in the upper edge
of the sheet to engage cleats spaced not more than 250 mm 10 inches on
centers. Locate the upper edge of flashing not less than 450 mm 18 inches
from the outside face of the building, measured along the roof slope. Fold
lower edge of the flashing over and loose-lock into a continuous edge strip
on the fascia. Where eave flashing intersects metal valley flashing,
secure with 25 mm one inch flat locked joints with cleats that are 250 mm
10 inches on centers. Place eave flashing over underlayment and in plastic
bituminous cement.
SECTION 07600
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