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US 4,538,388 AGranted
Positively vented flat roof system
AssigneeArmstrong World Industries, Inc.
InventorPaul F. Friesen
Life of this patent
Estimating the term…
Abstract
A double cuspated surface plastic film is positioned between the base of a roof structure and the roof covering material so as to provide a multitude of venting air passages under the roof covering.
Claims4
A ventilating roof system for providing positive and continuous ventilation of harmful water vapors from the roof system, said harmful, water vapors being generated above and below the roof system, comprising in combination:
- (a) a roofing deck providing the bottom structure of the roof system,
- (b) positioned over the roofing deck there being provided fibrous insulation material,
- (c) positioned over the fibrous insulation material there being provided a roofing membrane consisting of plural layers of roofing felt bonded together by a conventional roofing tar adhesive to form a water tight membrane, and
- (d) the improvement comprising:
- (1) a double cuspated surface plastic film means being positioned between the insulation and roofing membrane to form a plurality of positive and continuous ventilating passageways both above and below the membrane to permit the escape of water vapor from the region below the roofing membrane.
2 more elements
A ventilating roof structure as set forth in clam 1 wherein:
- (a) the double cuspated surface plastic film means is composed of a base layer and projecting from both sides thereof a plurality of cone shaped projections to form said positive and continuous ventilating passageways both above and below the membrane.
Dependencies are inferred from the claim text.