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US 2006/0179749 A1Published application
High density polyurethane and polyisocyanurate construction boards and composite boards
OwnerGregory Brandt, John Lettsinventors
Life of this patent
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Abstract
A covered low-slope or flat roof comprising (a) a roof deck, (b) an optional insulation board including a polyurethane or polyisocyanurate cellular structure having a density that is less than 2.5 pounds per cubic foot, (c) a coverboard including a polyurethane or polyisocyanurate cellular structure having a density greater than about 2.5 pounds per cubic foot, and (d) a membrane.
Claims18
A covered low-slope or flat roof comprising:
- (a) a roof deck;
- (b) an optional insulation board including a polyurethane or polyisocyanurate cellular structure having a density that is less than 2.5 pounds per cubic foot;
- (c) a coverboard including a polyurethane or polyisocyanurate cellular structure having a density greater than about 2.5 pounds per cubic foot;
- and
- (d) a membrane.
2 more elements
A method of re-roofing a low-slope or flat roof, the method comprising:
- (a) applying a re-coverboard to an existing covered low-slope or flat roof, wherein the re-coverboard includes a polyurethane or polyisocyanurate cellular structure having a density that is greater than about 2.5 pounds per cubic foot;
- and
- (b) applying a membrane to the re-coverboard subsequent to the step of applying a re-coverboard.
A composite board comprising:
- (I) a planar structure including
- (a) a first layer comprising a polyurethane or polyisocyanurate cellular structure having a density that is less than about 2.5 pounds per cubic foot, and
- (b) a second layer comprising a polyurethane or polyisocyanurate cellular structure having a density that is greater than about 2.5 pounds per cubic foot.
A composite board comprising:
- a least one low density layer comprising a polyurethane or polyisocyanurate cellular structure having a density that is less than about 2.5 pounds per cubic foot, and
- a least one high density layer comprising a polyurethane or polyisocyanurate cellular structure having a density that is greater than about 2.5 pounds per cubic foot.
Dependencies are inferred from the claim text.