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US4259127A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of weather-proofing surfaces particularly concrete roofs

Assignee: Tanis Ltd
•
Filing: 1978-01-06
•
Granted: 1981-03-31
•
Expires: 1998-01-06
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Abstract

Abstract A method of weather-proofing surfaces, particularly concrete roofs, is described wherein first applied is an inner layer of a soft asphalt (bitumen) having a softening point of 100°-140° F. and including reinforcing fibers, and then an overlying layer of an asphalt-saturated-felt. In one preferred example, the overlying layer is a glass-fiber mat saturated with a hard air-blown asphalt having a softening point of at least 180° F.; and in a second described example, it is paper saturated with soft (non-blown) asphalt and coated on its outer faces with the hard air-blown asphalt. The combination of the soft asphalt inner layer and the asphalt-saturated-felt outer layer has been found to produce a barrier impermeable to water travelling inwardly, but permeable to vapor travelling outwardly thereby avoiding the formation of blisters. This combination has been further found to be suitable for surfaces having extremely high slopes, even perfectly vertical surfaces, without the need for mechanical fastening devices.

Inventors

  • 👤 Haim Schachter

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 18:07
CPC Classifications
E; E04; E04D; E04D11/00; E04D11/02; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/24983; Y10T428/31504; Y10T428/31815

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 104 words
A method for weatherproofing a surface to provide a barrier which is substantially impermeable to water travelling inwardly but is permeable to moisture vapor travelling outwardly, which weatherproofing has sufficient tackiness so that it can be applied to surfaces of any slope without the need of mechanical fastening devices to prevent slippage, comprising: applying to the surface an inner weatherproofing layer of a cold coating mixture including a non-air-blown, steam-refined, soft asphalt having a softening point of 100°-140° F., reinforcing fibers, and a solvent to reduce the viscosity of the mixture to coatable consistency; and adhering to said inner layer an overlying felt layer.
Claim 2
Independent Claim 104 words
A method for weatherproofing a surface to provide a barrier which is substantially impermeable to water travelling inwardly but is permeable to moisture vapor travelling outwardly, which weatherproofing has sufficient tackiness so that it can be applied to surfaces of any slope without the need of mechanical fastening devices to prevent slippage, comprising: applying to the surface an inner weatherproofing layer of a cold coating mixture including a non-air-blown, steam-refined, soft asphalt having a softening point of 100°-140° F., reinforcing fibers, and a solvent to reduce the viscosity of the mixture to coatable consistency; and adhering to said inner layer an overlying felt layer.
Claim 3
Dependent Claim 23 words
The method according to claim 1, wherein the solvent is present from 15-20% by weight and has a boiling point of 300°-400° F.
Claim 4
Dependent Claim 28 words
The method according to claim 1, wherein said overlying felt layer includes outer faces of a hard, air-blown asphalt having a softening point of at least 180° F.
Claim 5
Dependent Claim 21 words
The method according to claim 3, wherein said overlying felt layer is a fiber-glass mat saturated with said hard air-blown asphalt.
Claim 6
Dependent Claim 36 words
The method according to claim 3, wherein said overlying felt layer is of paper saturated with soft asphalt having a softening point of 100°-140° F. and coated on its outer faces with said hard air-blown asphalt.
Claim 7
Dependent Claim 51 words
The method according to claim 1, wherein said cold coating mixture of the inner layer comprises, by weight: 60-65% of non-air-blown asphalt having a softening point of 120°-130° F.; 15-20% by weight of reinforcing fibers and stabilizers; and 15-20% by weight of a solvent having a boiling point of 300°-400° F.
Claim 8
Dependent Claim 18 words
The method according to claim 6, wherein said reinforcing fibers of the cold coating mixture comprise asbestos fibers.
Claim 9
Dependent Claim 11 words
The method according to claim 1, wherein said surface is concrete.
Claim 10
Dependent Claim 19 words
The method according to claim 8, wherein said concrete surface has a slope greater than two inches per foot.

References Cited (Backward Citations)

US2131085A Cited
US2481370A Cited
US2939794A Cited
US3712832A Cited
US3940540A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1984-03-30 1984-09-29 1985-03-31 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1988-03-30 1988-09-29 1989-03-31 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1992-03-30 1992-09-29 1993-03-31 $7700.00 Window Closed / Lapsed

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