High density polyurethane and polyisocyanurate construction...

Details High density polyurethane and polyisocyanurate construction... High density polyurethane and polyisocyanurate construction...

2011-07-05

2011-07-05

Chapman, Jeanette E (Department: 3633)

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

C428S319300, C428S319700, C052S309100, C052S408000, C052S783100

Reexamination Certificate

active

07972688

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.

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