US Patent 8001736 Exterior wall assembly including moisture transportation feature

An exterior wall assembly includes a wall frame supporting an interior wall layer and an exterior wall layer opposite the interior wall layer, a flexible sheet disposed within the exterior wall assembly, and a seal attached to the flexible sheet and configured to prevent ingress of water toward the wall frame. The flexible sheet is configured to transport moisture from between the interior wall layer and the exterior wall layer to a location outside of the exterior wall assembly.