US4351138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roof construction and method thereof
Assignee: Dow Chemical Co
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Filing: 1981-01-15
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Granted: 1982-09-28
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Expires: 2001-01-15
Abstract
Abstract In a roof wherein the roof has a water impermeable membrane disposed on a roof deck and a closed cell insulation material disposed over the membrane, individual blocks of insulating material are tied together by a water permeable sheet such as a scrim to permit floating of the insulation and a protective layer disposed thereon in the event of ponding.
Inventors
- 👤 William J. McMillan
- 👤 Jerry L. Severson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:15
CPC Classifications
E; E04; E04D; E04D11/00; E04D11/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
154 words
A roof structure comprising a roof support means having a roof deck, the roof deck having an upper surface and a lower surface, the upper surface of the roof deck supporting a water impermeable membrane, the impermeable membrane having an upper face and a lower face, the lower face being generally adjacent the roof deck; a thermally insulating layer disposed adjacent the upper face of the water impermeable membrane, the thermally insulating layer comprising a plurality of closed cell water impermeable insulating members, the insulating members defining fissures between adjacent members, a coherent water permeable fabric layer disposed over the insulating members, the coherent water permeable layer being affixed to the insulating members, whereby in the event of ponding, the insulating members will float and be generally uniformly displaced according to the amount of water in a particular area of the roof, and the insulating members generally will not displace relative to adjacent members.
Claim 2
Dependent Claim
154 words
A roof structure comprising a roof support means having a roof deck, the roof deck having an upper surface and a lower surface, the upper surface of the roof deck supporting a water impermeable membrane, the impermeable membrane having an upper face and a lower face, the lower face being generally adjacent the roof deck; a thermally insulating layer disposed adjacent the upper face of the water impermeable membrane, the thermally insulating layer comprising a plurality of closed cell water impermeable insulating members, the insulating members defining fissures between adjacent members, a coherent water permeable fabric layer disposed over the insulating members, the coherent water permeable layer being affixed to the insulating members, whereby in the event of ponding, the insulating members will float and be generally uniformly displaced according to the amount of water in a particular area of the roof, and the insulating members generally will not displace relative to adjacent members.
Claim 3
Dependent Claim
16 words
The roof structure of claim 1 including a protective layer disposed over the water permeable layer.
Claim 4
Dependent Claim
12 words
The roof structure of claim 2 wherein the protective layer is gravel.
Claim 5
Dependent Claim
17 words
The roof structure of claim 1 wherein the water permeable layer is adhered to the insulating members.
Claim 6
Dependent Claim
18 words
The roof structure of claim 1 wherein the water permeable layer is mechanically affixed to the insulating members.
Claim 7
Dependent Claim
13 words
The roof structure of claim 1 wherein the fabric is a polypropylene fabric.
Claim 8
Independent Claim
102 words
The method of preparing a built up roof, the method comprising applying and affixing to a roof deck a water impermeable membrane, disposing on the water impermeable membrane a plurality of closed cell water impermeable thermal insulating members which define fissures between adjacent members, applying a water permeable web above the insulating members and affixing the web to the insulating members, whereby in the event of ponding the insulating members will float and be generally uniformly displaced according to the amount of water in a particular area of the roof, and the insulating members generally will not displace relative to adjacent members.
Claim 9
Independent Claim
102 words
The method of preparing a built up roof, the method comprising applying and affixing to a roof deck a water impermeable membrane, disposing on the water impermeable membrane a plurality of closed cell water impermeable thermal insulating members which define fissures between adjacent members, applying a water permeable web above the insulating members and affixing the web to the insulating members, whereby in the event of ponding the insulating members will float and be generally uniformly displaced according to the amount of water in a particular area of the roof, and the insulating members generally will not displace relative to adjacent members.
Claim 10
Dependent Claim
18 words
The method of claim 7 including the step of disposing a protective layer over the water permeable web.
Claim 11
Dependent Claim
16 words
The method of claim 8 including the step of adhering the web to the insulating members.
Claim 12
Dependent Claim
17 words
The method of claim 7 including the step of mechanically affixing the web to the insulating members.
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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) | 1985-09-27 | 1986-03-29 | 1986-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-27 | 1990-03-29 | 1990-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-27 | 1994-03-29 | 1994-09-28 | $7700.00 | Window Closed / Lapsed |