| abstract |
A coating composition for use as a water vapor permeable air barrier. The coating composition comprises an acrylic latex, 1-10% by weight of glycol ether, and 0.25-5% by weight of humectant. The coating composition, when measured at 77 °F (25 C) using a Brookfield HB viscometer equipped with Spindle 3 at 2.5 RPM, has a viscosity ranging from 5000 to 500000 cPs. When coalesced, the coating composition forms a water vapor permeable air barrier having a water vapor permeance greater than 1 Perm at 35 mil film thickness when measured at 77°F (25C) and 50% RH, according to ASTM E96/E96M-16, Method B. |