| 摘要 |
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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