US3884009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of ventilating a roof system
Assignee: WR Grace and Co
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Filing: 1973-10-26
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Granted: 1975-05-20
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Expires: 1993-10-26
Abstract
Abstract Moisture entrapped within roofing systems of the type wherein a layer of normally low-permeance, cellular plastic insulation board (e.g. foamed polystyrene) is employed in conjunction with at least one layer of moisture-bearing construction material (e.g. lightweight insulating vermiculite concrete) is made able to be vented from within the system by providing the board with a plurality of openings therethrough and further preventing the fluid construction material when placed upon the board from entering and filling the openings. Such prevention of filling of the openings may be accomplished by making the dimension of the openings such that the fluid construction material will not flow therein yet moisture will pass, or by covering the openings with a material (e.g. paper) which will prevent such filling, the material however being permeable by any moisture later entrapped within the roofing system.
Inventors
- 👤 Robert T Frohlich
- 👤 John L Wright
- 👤 Bruce A Blessington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:12
CPC Classifications
E; E04; E04D; E04D13/00; E04D13/17; E04D13/172; E04D11/00; E04D11/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
154 words
The method of constructing a ventilated, insulated roof comprising the steps of providing a subdeck of substantially rigid metal sheeting having a non-planar surface and apertures therethrough for permitting passage of moisture, casting a first layer of fluid lightweight insulating concrete over the metal subdeck, placing a plurality of normally low-permeance insulation boards comprised of cellular plastic material over said first layer of concrete, said boards having a plurality of openings therethrough of such dimension that passage of moisture is permitted yet substantial filling of the openings by fluid concrete placed thereon is prevented, casting a second layer of said fluid concrete directly upon said boards and thereafter placing a layer of waterproofing material over said second layer of concrete, whereby moisture from said second layer of concrete can be directly vented through the vacant openings maintained in said board, through said first layer of concrete and out said apertures in said corrugated sheeting.
Claim 2
Independent Claim
154 words
The method of constructing a ventilated, insulated roof comprising the steps of providing a subdeck of substantially rigid metal sheeting having a non-planar surface and apertures therethrough for permitting passage of moisture, casting a first layer of fluid lightweight insulating concrete over the metal subdeck, placing a plurality of normally low-permeance insulation boards comprised of cellular plastic material over said first layer of concrete, said boards having a plurality of openings therethrough of such dimension that passage of moisture is permitted yet substantial filling of the openings by fluid concrete placed thereon is prevented, casting a second layer of said fluid concrete directly upon said boards and thereafter placing a layer of waterproofing material over said second layer of concrete, whereby moisture from said second layer of concrete can be directly vented through the vacant openings maintained in said board, through said first layer of concrete and out said apertures in said corrugated sheeting.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein said openings have at least one cross-wise dimension not greater than about 0.37 inch.
Claim 4
Dependent Claim
20 words
The method of claim 1 wherein said openings are circular and have a diameter not greater than about 0.37 inch.
Claim 5
Dependent Claim
36 words
The method of claim 1 wherein said openings are in the form of elongated, generally rectangular configuration and have a width not greater than about 0.37 inch and a length of up to about 2.25 inches.
Claim 6
Dependent Claim
26 words
The method of claim 1 wherein said openings are in the form of elongated, generally rectangular slots having a width of up to about 0.37 inch.
Claim 7
Dependent Claim
28 words
The method of claim 1 wherein said boards have additional openings of sufficient dimension that said second layer of fluid concrete will enter and substantially fill such openings.
Claim 8
Independent Claim
140 words
The method of constructing a ventilated, insulated roof comprising the steps of providing a layer of substantially rigid subdecking material, placing a layer of normally low-permeance insulation board comprised of cellular plastic material over said subdecking, said board having a plurality of openings therethrough of such dimension that passage of moisture therethrough is permitted yet substantial filling of such openings by a fluid moisture-bearing construction material placed thereon is prevented, said board further having additional openings therethrough of a dimension such that said construction material will flow into and substantially fill these openings, casting a layer of said fluid moisture-bearing construction material upon said layer of board whereby the openings through the board able to be filled are substantially filled by the construction material, and thereafter positioning a layer of waterproofing material above the layer of said moisture-bearing construction material.
Claim 9
Independent Claim
140 words
The method of constructing a ventilated, insulated roof comprising the steps of providing a layer of substantially rigid subdecking material, placing a layer of normally low-permeance insulation board comprised of cellular plastic material over said subdecking, said board having a plurality of openings therethrough of such dimension that passage of moisture therethrough is permitted yet substantial filling of such openings by a fluid moisture-bearing construction material placed thereon is prevented, said board further having additional openings therethrough of a dimension such that said construction material will flow into and substantially fill these openings, casting a layer of said fluid moisture-bearing construction material upon said layer of board whereby the openings through the board able to be filled are substantially filled by the construction material, and thereafter positioning a layer of waterproofing material above the layer of said moisture-bearing construction material.
Claim 10
Dependent Claim
30 words
The method of claim 7 wherein the total area of the openings in said board comprises from about 0.5 to about 50 percent of the surface area of the board.
Claim 11
Dependent Claim
30 words
The method of claim 7 wherein the total area of the openings in said board comprises from about 1 to about 4 percent of the surface area of the board.
Claim 12
Dependent Claim
21 words
The method of claim 7 wherein said subdecking material has apertures therein to permit moisture from said openings to pass therethrough.
Claim 13
Dependent Claim
13 words
The method of claim 7 wherein said board is comprised of foamed polystyrene.
References Cited (Backward Citations)
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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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |