Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
John B. Letts0
Gregory A. Brandt0
Date of Patent
July 5, 2011
Patent Application Number
11343466
Date Filed
January 30, 2006
Patent Citations Received
Patent Primary Examiner
Patent 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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