Vapor permeable shingles and underlayment sheeting for a...

Details Vapor permeable shingles and underlayment sheeting for a... Vapor permeable shingles and underlayment sheeting for a...

E - Fixed Constructions

04

D

E04D 1/12 (2006.01)

Patent

CA 2121624

ABSTRACT OF THE DISCLOSURE A vapor permeable roof covering comprised of an asphaltic-type shingle and a coated underlayment sheeting, the shingle and sheeting having an array of pierced openings therethrough spaced along the length and width thereof con- structed and arranged to permit only the passage there- through of water vapor under vapor pressure and concurrently prevent passage of liquid water therethrough.

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