Membrane roofing system
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United States of America Patent
Stats
-
Feb 7, 1989
Issued Date -
N/A
app pub date -
Feb 24, 1988
filing date -
Aug 27, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved membrane roofing arrangement is designed to eliminate the problem of 'blistering' in prior art single membrane system. The membrane roofing arrangement comprises a perforated underlay sheet interposed between a single membrane and the roof, the perforated sheet preventing adhesion of the membrane to the roof at the non-perforated portions of the underlay sheet. In this manner, paths are provided between the membrane and roof for venting vapor to the edges of the membrane and/or suitable vents, thereby eliminating blistering of the membrane.
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Family
International Classification(s)
Cited Art Landscape
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