[2.1.5
Tapered Roof Insulation
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NOTE: Where tapered roof insulation is used on a
substrate sloped one in 48 1/4 inch per foot and
greater, insulation having a slope of one in 48 1/4
inch per foot may be specified. Otherwise, specify
tapered insulation having a slope of one in 24 1/2
inch per foot.
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One layer of the tapered roof insulation assembly shall be factory tapered
to a slope of not less than one in [24] [48] [1/4] [1/2] inch per foot.
Provide starter and filler blocks as required to provide the total
thickness of insulation necessary to meet the specified slope and thermal
conductance. Mitered joints shall be factory fabricated and shall consist
of two diagonally cut boards or one board shaped to provide the required
slopes. Identify each piece of tapered insulation board by color or other
identity coding system, allowing the identification of different sizes of
tapered insulation board required to complete the roof insulation system.
][2.1.6
Cants and Tapered Edge Strips
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NOTE: Generally cant strips are not required for
single ply roofing systems. However, if cant strips
are necessary, coordinate the location of cant
strips with mechanical drawings to ensure that no
projections, such as vent pipes and braces, will be
constructed through cant strips or within 250 mm 10
inches from cant strips. Specify wood cants, edge
strips, and pressure preservative treatment in
Section 06100NA.
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Provide preformed cants and tapered edge strips of the same material as the
roof insulation; or, when roof insulation material is unavailable, provide
pressure-preservative treated wood, wood fiberboard, or rigid perlite board
cants and edge strips as recommended by the roofing manufacturer, unless
otherwise indicated. Face of cant strips shall have incline of 45 degrees
and vertical height of 100 mm 4 inches. Taper edge strips at a rate of 85
to 125 mm per meter one to 1 1/2 inch per foot down to approximately 3 mm
1/8 inch thick.
][2.2
PROTECTION BOARD
For use as a thermal barrier (underlayment), fire barrier (overlayment), or
protection board for hot-mopped, torched-down, or adhesively-applied
roofing membrane over roof insulation.
][2.2.1
Glass Mat Gypsum Roof Board
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NOTE: Specify glass mat gypsum roof board as a
contractor's option to wood fiberboard, expanded
perlite, or other suitable material, when an
underlayment or overlayment is required for the roof
insulation board.
SECTION 07220
Page 14
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