Quantcast Design Requirements/Considerations

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perimeters and at openings.
Such anchorage serves several
a)  To prevent stress concentration at flashings, which
could either split or pull loose from their backings and become
vulnerable to puncture. (Loose-laid systems receive maximum
membrane tensile forces at perimeters and other terminations,
according to field strain tests);
b)  To restrain contraction in materials subject to
long-term shrinkage;
To reduce membrane wrinkling which can obstruct
Design Requirements/Considerations
Single-Ply Roofs.  For roofs on new facilities (Refer
to  Section 10 for reroofing):
a)  Require minimum 1/2 inch per foot (4 percent)
slope, 2 inch per foot (17 percent) maximum slope for loose-laid,
ballasted systems.
b)  Review material properties, limitations, advantages
and disadvantages, and past performance of all systems under
consideration (check 10-year performance in your geographical
c)  Determine wind and fire resistance during this
preliminary survey.  Consult Single Ply Roofing Institute (SPRI)
Wind Design Guide for Ballasted Single-Ply Roof Systems Single-
Ply Roofing.  Ballasted systems should not be specified in
coastal areas;
d)  Check substrate for suitability: for sheet
membranes, suitable substrates are structural concrete (cast-in-
place and precast), lightweight insulating concrete with low
moisture content, plywood, and rigid insulation board; for fluid-
applied membranes, suitable substrates are structural concrete
(cast-in-place and precast) and sprayed-in-place polyurethane
e)  For cast-in-place concrete decks, check concrete
curing agents to ensure compatibility with synthetic membranes.
Some curing agents can cause poor adhesion or even premature
deterioration of the membrane;


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