[perimeter walls,] [roof penetrating components,] [and] [equipment
supports] are in place.
b.
Surfaces are rigid, clean, dry, smooth, and free of cracks, holes,
and sharp changes in elevation. Joints in substrate are sealed to
prevent drippage of bitumen into building or down exterior walls.
Surfaces shall be inspected and approved immediately before
application of roofing and flashings. The roofing and flashings
shall be applied to a smooth and firm surface free from ice,
frost, visible moisture, dirt, projections, and foreign materials.
c.
The plane of the substrate does not vary more than 6 mm (1/4 inch)
within an area 3 by 3 meters (10 by 10 feet) when checked with a 3
meter (10 foot) straight edge placed anywhere on the substrate.
d.
Substrate is sloped as indicated to provide drainage.
e.
Walls and vertical surfaces are constructed to receive
counterflashing and will permit mechanical fastening of the base
flashing materials.
f.
Treated wood nailers are in place on non-nailable surfaces, to
permit nailing of base flashing at minimum height of 8 inches
above finished roofing surface.
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NOTE: Coordinate with Section 06100, "Rough
Carpentry," to ensure that waterborne preservative
treatment is specified for wood which will be in
contact with roofing components.
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g.
Treated wood nailers are fastened in place at eaves, gable ends,
openings, and intersections with vertical surfaces for securing of
felts, edging strips, attachment flanges of sheet metal, and roof
fixtures. [Embedded nailers are flush with deck surfaces.]
[Surface-applied nailers are same thickness as roof insulation.]
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NOTE: Wood cants should also be used where there
are non-wall supported flashings at wood blocking
forming area dividers and expansion joints, and at
wall and roof intersections where roof deck is not
supported on wall.
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h.
Cants are securely fastened in place in the angles formed by walls
and other vertical surfaces. The angle of the cant is
approximately 45 degrees and the height of the vertical leg is not
less than nominal 89 mm (3-1/2 inches). Cants shall be laid in a
solid asphalt mopping or coat of asphalt cement just prior to
laying the roofing plies.
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NOTE: Include venting provision for wet fill
substrate materials like lightweight cellular
concrete.
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SECTION 07511
Page 19
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