| abstract |
A weather resistive barrier (WRB) for external protection of a building substrate may have a moisture permeability that decreases as the temperature increases. In one embodiment, the WRB includes a coating that includes an LCST polymer and may further include a second polymer. The WRB may be part of a building assembly, part of a sheet, or the sheet itself, the sheet having an air permeability of less than 0.02 L/(sm 2 ) at a pressure of 75 Pa. In addition, the liquid coating composition may comprise an LCST polymer and a second polymer, wherein the liquid coating composition has an air permeability of less than 0.02 L/(sm 2 ) at a pressure of 75 Pa, wherein the solid coating formed by the liquid coating composition, It can be adjusted to have a moisture permeability that decreases with increasing temperature. |