| abstract |
The weather resistive barrier (WRB) for external protection of building substrates may have a moisture permeability that decreases with increasing temperature. In one embodiment, the WRB comprises a coating that includes an LCST polymer and may further comprise a second polymer. The WRB may be a portion of a building assembly, a portion of a sheet, or a sheet itself, and the sheet has an air permeability of less than 0.02 L / (cm 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 is such that the solid coating formed by the liquid coating composition has an air permeability of less than 0.02 L / (cm 2 ) at a pressure of 75 Pa, Can be adjusted to have a moisture permeability that decreases as the temperature increases. |