Membrane roofing system

Details Membrane roofing system Membrane roofing system

Filed on

1988-02-24

Date issued

1989-02-07

Examiner

Robinson, Ellis P.

Patent Class

Stock material or miscellaneous articles

SubClass

Structurally defined web or sheet

SubSubClass

Including aperture

Other Related Categories

428137, 428138, 428198, B32B 310

Type

Patent

Status

active

Patent number

048031119

Description

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.

REFERENCES:
patent: 2240326 (1941-04-01), Burns
patent: 2745779 (1956-05-01), Ritter et al.
patent: 3173991 (1965-03-01), Breakfield, Sr.
patent: 3369958 (1968-02-01), Fleeman
patent: 3398041 (1968-08-01), Ferree
patent: 3483664 (1969-12-01), Funk et al.
patent: 4617221 (1986-10-01), von der Chys

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