US4045934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roof and method of preparation
Assignee: Dow Chemical Co
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Filing: 1976-04-02
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Granted: 1977-09-06
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Expires: 1996-04-02
Abstract
Abstract Ponding is eliminated or substantially reduced on flat roofs by employing a closed cell, thermally insulating foam above the water barrier layer and varying the thickness of the closed cell foam to displace at least a majority of water which might accumulate in areas subject to ponding.
Inventors
- 👤 James P. Sheahan
- 👤 Lowell E. Putnam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:35
CPC Classifications
E; E04; E04D; E04D13/00; E04D13/16; E04D13/1606; E04D13/1662; E04D11/00; E04D11/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
146 words
A roof structure, the roof structure comprising in cooperative combination a roof support means, the roof support means carrying thereon a roof deck, the roof deck supporting a water impermeable membrane, the water impermeable membrane having a generally flat surface generally coextensive with the roof and deck, a first layer of closed cell plastic foam insulation adjacent the membrane and remote from the deck, the membrane and first layer defining at least one generally upwardly facing cavity in which water does not drain under the influence of the force of gravity, the improvement which comprises at least one second layer of a closed cell plastic foam disposed within the cavity, the plastic foam of the second layer being present in a quantity sufficient to displace at least a major portion of water which would collect in the cavity under the influence of the force of gravity.
Claim 2
Dependent Claim
146 words
A roof structure, the roof structure comprising in cooperative combination a roof support means, the roof support means carrying thereon a roof deck, the roof deck supporting a water impermeable membrane, the water impermeable membrane having a generally flat surface generally coextensive with the roof and deck, a first layer of closed cell plastic foam insulation adjacent the membrane and remote from the deck, the membrane and first layer defining at least one generally upwardly facing cavity in which water does not drain under the influence of the force of gravity, the improvement which comprises at least one second layer of a closed cell plastic foam disposed within the cavity, the plastic foam of the second layer being present in a quantity sufficient to displace at least a major portion of water which would collect in the cavity under the influence of the force of gravity.
Claim 3
Dependent Claim
16 words
The roof of claim 1 wherein the first layer comprises a plurality of generally rectangular planks.
Claim 4
Dependent Claim
16 words
The roof of claim 2 wherein the second layer comprises a plurality of generally rectangular planks.
Claim 5
Dependent Claim
23 words
The roof of claim 3 including a layer of particulate inorganic material disposed over the plastic foam of the first and second layers.
Claim 6
Dependent Claim
12 words
The roof of claim 4 wherein the particulate inorganic material is gravel.
Claim 7
Independent Claim
109 words
A method for roofing and reroofing, the steps of the method comprising; providing an upwardly facing roof surface having a first layer of closed cell plastic foam insulation thereon, the roof surface being subject to ponding, that is the collection of water in at least one upwardly facing cavity of the roof surface under the influence of gravity, the cavity being so arranged that water collected therein is not displaced therefrom by the force of gravity, the improvement which comprises disposing within the cavity a second layer of closed cell plastic foam sufficient to displace at least a major portion of water which would otherwise collect in said cavity.
Claim 8
Independent Claim
109 words
A method for roofing and reroofing, the steps of the method comprising; providing an upwardly facing roof surface having a first layer of closed cell plastic foam insulation thereon, the roof surface being subject to ponding, that is the collection of water in at least one upwardly facing cavity of the roof surface under the influence of gravity, the cavity being so arranged that water collected therein is not displaced therefrom by the force of gravity, the improvement which comprises disposing within the cavity a second layer of closed cell plastic foam sufficient to displace at least a major portion of water which would otherwise collect in said cavity.
Claim 9
Dependent Claim
15 words
The method of claim 6 wherein the first and second layers comprise generally rectangular planks.
Claim 10
Dependent Claim
22 words
The method of claim 7 including the steps of disposing a layer of particulate inorganic material over the first and second layers.
Claim 11
Dependent Claim
12 words
The method of claim 8 wherein the particulate inorganic material is gravel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |