US4538388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positively vented flat roof system
Assignee: Armstrong World Industries Inc
•
Filing: 1983-02-07
•
Granted: 1985-09-03
•
Expires: 2003-02-07
Abstract
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.
Inventors
- 👤 Paul F. Friesen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:44
CPC Classifications
E; E04; E04D; E04D13/00; E04D13/17
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
142 words
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.
Claim 2
Dependent Claim
142 words
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.
Claim 3
Dependent Claim
51 words
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.
Claim 4
Dependent Claim
51 words
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.
Claim 5
Dependent Claim
52 words
A ventilating roof structure as set forth in claim 2 wherein: (a) the cone structures of the double cuspated surface plastic film means are approximately 1/8" in height and are of a density of approximately 80 cones per square inch on both sides of the base layer of the plastic film means.
Claim 6
Dependent Claim
57 words
A ventilating roof structure as set forth in claim 3 wherein: (a) a conventional roof vent interconnects the double cuspated surface plastic film and the exterior of the roof above the roofing membrane to provide venting of the postive and continuous ventilating passageways of the double cuspated surface plastic film to the area above the roof membrane.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |