Patent US4670071A successfully refreshed from Google Patents.
US4670071A
Expired / Lapsed
US
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Method of forming a waterproof roof
Assignee: Coal Industry Patents Ltd
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Filing: 1984-10-23
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Granted: 1987-06-02
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Expires: 2004-10-23
Abstract
Abstract A roofing method comprises applying to a roof deck a self-adhesive sheet comprising an adhesive and waterproofing layer of bituminous compound so that the sheet adheres to the deck over an area of 10-50% of the total sheet area and water vapor passing through the deck may escape laterally; rendering the upper surface of the sheet adhesive, for example by torching; optionally applying insulation board and a further self-adhesive sheet, and applying a final waterproofing sheet. The use of hot bitumen is completely avoided, the formation of waterproof and insulated roofs is simplified and economies are offered.
Inventors
- 👤 Gregory R. Cooper
- 👤 Robert J. Pragnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:33
CPC Classifications
E; E04; E04D; E04D11/00; E04D11/02; E04D5/00; E04D5/12; Y; Y10; Y10T; Y10T428/00; Y10T428/14; Y10T428/141; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T442/00; Y10T442/20; Y10T442/2041; Y10T442/2049; Y10T442/60; Y10T442/674
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
202 words
A method of forming a waterproof roof on a roof deck, comprising the steps of (i) applying to the deck, a self-adhesive sheet comprising a pressure-sensitive, adhesive and waterproofing layer of a bituminous compound so that the sheet adheres to the deck over an area of 10-50% of the total sheet area and thus water vapour passing through said deck may escape laterally; said self-adhesive sheet adhering to one face of the bituminous compound, and having at least discontinuous apertures of 10-50% of the area over the sheet; applying pressure sufficient to cause flow of said bituminous compound through said apertures; and causing the self-adhesive sheet to adhere to the roof deck in the area of the apertures; (ii) rendering the upper surface of said sheet adhesive; (iii) applying to said adhesive upper surface of said sheet, a layer of substantially rigid and substantially non-compressible insulation and causing said insulation to adhere to said upper surface, and applying to the upper surface of said insulation a further self-adhesive sheet as defined in step (i) and rendering the upper surface of said further sheet adhesive; and (iv) applying to said adhesive surface of the sheet or said further sheet a final waterproofing sheet.
Claim 2
Independent Claim
202 words
A method of forming a waterproof roof on a roof deck, comprising the steps of (i) applying to the deck, a self-adhesive sheet comprising a pressure-sensitive, adhesive and waterproofing layer of a bituminous compound so that the sheet adheres to the deck over an area of 10-50% of the total sheet area and thus water vapour passing through said deck may escape laterally; said self-adhesive sheet adhering to one face of the bituminous compound, and having at least discontinuous apertures of 10-50% of the area over the sheet; applying pressure sufficient to cause flow of said bituminous compound through said apertures; and causing the self-adhesive sheet to adhere to the roof deck in the area of the apertures; (ii) rendering the upper surface of said sheet adhesive; (iii) applying to said adhesive upper surface of said sheet, a layer of substantially rigid and substantially non-compressible insulation and causing said insulation to adhere to said upper surface, and applying to the upper surface of said insulation a further self-adhesive sheet as defined in step (i) and rendering the upper surface of said further sheet adhesive; and (iv) applying to said adhesive surface of the sheet or said further sheet a final waterproofing sheet.
Claim 3
Dependent Claim
37 words
A method as claimed in claim 1, wherein the exposed bituminous compound in the area of the apertures is protected by a release sheet which is stripped off before application of the sheet to the roof deck.
Claim 4
Dependent Claim
33 words
A method as claimed in claim 1, wherein the upper surface of the self-adhesive sheet is protected by a thin low-melting polymer facing sheet, and the upper surface is rendered adhesive by torching.
Claim 5
Dependent Claim
27 words
A method as claimed in claim 1, wherein the roof deck surface is primed using a solution of a polymer-modified bitumen before application of the self-adhesive sheet.
Claim 6
Dependent Claim
20 words
A method as claimed in claim 1, wherein an insulation board which is expanded polystyrene is used in step (iii).
Claim 7
Dependent Claim
19 words
A method as claimed in claim 1, wherein the final waterproofing sheet is an aluminium-faced bitumen sandwich cap sheet.
Claim 8
Independent Claim
145 words
A method of forming a waterproof roof on a roof deck, comprising the steps of (i) applying to the deck, a self-adhesive sheet comprising a pressure-sensitive, adhesive and waterproofing layer of a bituminous compound so that the sheet adheres to the deck over an area of 10-50% of the total sheet area and thus water vapour passing through said deck may escape laterally; said self-adhesive sheet ahering to one face of the bituminous compound, and having at least discontinuous apertures of 10-50% of the area of the sheet; applying pressure sufficent to cause flow of said bituminous compound through said aperatures; and causing the self-adhesive sheet to adhere to the roof deck in the area of the apertures; (ii) rendering the upper surface of said sheet adhesive; and (iii) applying to said adhesive surface of the sheet or said further sheet a final waterproofing sheet.
Claim 9
Independent Claim
145 words
A method of forming a waterproof roof on a roof deck, comprising the steps of (i) applying to the deck, a self-adhesive sheet comprising a pressure-sensitive, adhesive and waterproofing layer of a bituminous compound so that the sheet adheres to the deck over an area of 10-50% of the total sheet area and thus water vapour passing through said deck may escape laterally; said self-adhesive sheet ahering to one face of the bituminous compound, and having at least discontinuous apertures of 10-50% of the area of the sheet; applying pressure sufficent to cause flow of said bituminous compound through said aperatures; and causing the self-adhesive sheet to adhere to the roof deck in the area of the apertures; (ii) rendering the upper surface of said sheet adhesive; and (iii) applying to said adhesive surface of the sheet or said further sheet a final waterproofing sheet.
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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) | 1990-06-01 | 1990-12-01 | 1991-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-01 | 1994-12-01 | 1995-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-01 | 1998-12-01 | 1999-06-02 | $7700.00 | Window Closed / Lapsed |