Patent ID: 6355333
Filing Date: 2002-03-12
Classification: E04B,Y10S,Y10T

Abstract:
A construction membrane comprising a unitary, nonwoven, spunbonded, barrier sheet material consisting essentially of synthetic plexifilamentary fibers, said sheet material having a basis weight of less than 600 g/m2, a hydrostatic head of greater than 12 cm, a Gurley Hill porosity of greater than 10 seconds, a moisture vapor transmission rate, measured by the LYSSY method, of at least 25 g/m2/day,said barrier sheet material having a first side thereof, said first side thereof being textured with protrusions in a random polyhedral pattern, said protrusions having a height in the range of 0.25 mm to 1.0 mm, said protrusions defining channels oriented in multiple directions for providing paths by which a liquid against the first side of the sheet can drain.