f. Treated wood nailers are in place on non-nailable surfaces, to
permit nailing of base flashing at minimum height of 200 mm 8
inches above finished roofing surface.
**************************************************************************
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.
**************************************************************************
g. Treated wood nailers are fastened in place at eaves, gable ends,
openings, and intersections with vertical surfaces for securing of
membrane, edging strips, attachment flanges of sheet metal, and
roof fixtures. [Embedded nailers are flush with deck surfaces.]
[Surface-applied nailers are the same thickness as the roof
insulation.]
**************************************************************************
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.
**************************************************************************
h.
Cants are securely fastened in place in the angles formed by walls
and other vertical surfaces. The angle of the cant is 45 degrees
and the height of the vertical leg is not less than 89 mm (3-1/2
inches).
**************************************************************************
NOTE: Include venting provision for wet fill
substrate materials like lightweight cellular
concrete.
**************************************************************************
[
i.
Venting is provided in accordance with the following:
[
(1) Edge Venting: Perimeter nailers are kerfed across the width
of the nailers to permit escape of gaseous pressure at roof edges.]
[
(2) Underside Venting: Vent openings are provided in steel form
decking for cast-in-place concrete substrate.]
[
(3) Vapor pressure relief vents: Holes equal to the outside
diameter of vents are provided through the insulation where vents
are required. Space vents in accordance with membrane
manfacturer's recommendations.]]
j.
Exposed nail heads in wood substrates are properly set. Warped
and split [boards] [sheets] have been replaced. There are no
cracks or end joints 6 mm (1/4 inch) in width or greater. Knot
holes are covered with sheet metal and nailed in place. [Wood]
[Plywood] decks are covered with rosin paper or unsaturated felt
prior to base sheet or roof membrane application.[ Joints in
plywood substrates are taped or otherwise sealed to prevent air
leakage from the underside.]
SECTION 07550
Page 23
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