Self-adhered air barrier membrane
View Patent ↗Disclosed is a self-adhered, vapor permeable, air barrier membrane that is easy to install. The membrane has a Young's modulus of 3000 to 80,000 psi, most preferably 4000 to 15,000 psi, in the cross-direction and 5000 to 100,000 psi, most preferably 5000 to 20,000 psi, in the machine direction.
1. A self-adhered, vapor permeable, air barrier membrane comprising a vapor permeable, spun-bond, non-woven polyolefin sheet coated or partially coated with a pressure sensitive adhesive and having a removable release sheet on the adhesive, wherein the membrane has a Young's modulus of 4000 to 15,000 psi in the cross-direction and 5000 to 20,000 psi in the machine direction, and has a vapor permeance greater than 15 perms (ASTM E96A at 75° F.).
2. The air barrier membrane of claim 1 having an industry acceptable water and air resistance as defined by AC 38 (ICC-ES) and ASTM E 2179.
3. The air barrier membrane of claim 1 having an air resistance of less than 0.004 cfm/ft 2 at 75 Pa.
4. The air barrier membrane of claim 3 wherein said polyolefin sheet is partially coated with said pressure sensitive adhesive.
5. The air barrier membrane of claim 4 having a vapor permeance greater than 20 perms.
6. The air barrier membrane of claim 1 wherein the pressure sensitive adhesive is a vapor permeable pressure sensitive adhesive.
7. The air barrier membrane of claim 6 wherein the polyolefin sheet is completely coated with the vapor permeable pressure sensitive adhesive.
8. The air barrier membrane of claim 1 wherein the pressure sensitive adhesive is a vapor impermeable pressure sensitive adhesive and wherein the polyolefin sheet is partially coated with the vapor impermeable pressure sensitive adhesive.
9. The air barrier membrane of claim 8 wherein the vapor permeable pressure sensitive adhesive coats about 30% to 80% of the surface area of the polyolefin sheet.
10. The air barrier membrane of claim 8 wherein the vapor permeable pressure sensitive adhesive coats about 40% to 70% of the surface area of the polyolefin sheet.