attachment of lightweight pipe, conduit, and
drainage lines routed along roof surface.
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Precast concrete, minimum 38 mm (1-1/2 inch thick), minimum 450 mm (18
inches) square for walkways and minimum 150 mm by 300 mm (6-inch by 12-inch)
for use in supporting surface bearing components but extending not less
than 50 mm (2 inches) beyond all sides of surface bearing bases. Install
walkpad material under all paver blocks.
][2.13
ROOF INSULATION BELOW MODIFIED BITUMEN MEMBRANE SYSTEM
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NOTE: If the roofing system contains insulation,
coordinate with the appropriate insulation
specification section. The insulation specification
should include materials and installation up to the
substrate on which the roof membrane base sheet and
or membrane layers are to be installed. Coordinate
base sheet attachment (mechanically fastened or
mopped) with FM or UL fire and wind uplift
requirements.
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Insulation shall be compatible with the roof membrane, approved by the
membrane manufacturer and as specified in Section 07220 ROOF AND DECK
INSULATION.
]2.14
MEMBRANE LINER
Self-adhering modified bitumen underlayment comforming to ASTM D 1970, EPDM
membrane liner conforming to ASTM D 4637, or other waterproof membrane
liner material as approved by the Contracting Officer.
PART 3
EXECUTION
3.1
EXAMINATION
Ensure that the following conditions exist prior to application of the
roofing materials:
a.
[Drains,] [curbs,] [cants,] [control joints,] [expansion joints,]
[perimeter walls,] [roof penetrating components,] [and] [equipment
supports] are in place.
b.
Surfaces are rigid, clean, dry, smooth, and free from cracks,
holes, and sharp changes in elevation. Joints in the substrate
are sealed to prevent dripping of bitumen into building or down
exterior walls.
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 positive drainage.
e.
Walls and vertical surfaces are constructed to receive
counterflashing, and will permit mechanical fastening of the base
flashing materials.
SECTION 07550
Page 22
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