Construction membrane
AssigneeE. I. Du Pont de Nemours and Company
InventorsJames Ross Waggoner, Mieczyclaw Stachnik, Theresa A. Weston, Michael Allen Bryner
Life of this patent
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Abstract
A construction membrane that resists liquid and air penetration, is moisture vapor permeable, and has integral drainage channels is provided. An exterior wall construction incorporating such barrier sheet material is also provided. The wall construction may be faced with stucco, siding, brick or stone. A method for bonding and texturing the construction membrane is also provided.
Claims13
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.
A wall structure comprising a support frame, a barrier sheet material over said support frame, and an exterior protective layer over said barrier sheet, wherein said barrier sheet material is a unitary, nonwoven, spunbonded sheet 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, and
- wherein said barrier sheet material has 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 a path by which a liquid against the first side of the sheet can drain.
Dependencies are inferred from the claim text.