Abstract: Aspects of the disclosure relate to a drain assembly that incudes first and second plates, moisture inlet and outlet, a flexible sheet disposed between the first and second plates and extending between the moisture inlet and outlet. The flexible sheet is configured to wick moisture. The drain assembly is configured to position in an opening in a building envelope assembly, seal between the moisture inlet and the moisture outlet adjacent the flexible sheet, and transport moisture from the moisture inlet to the moisture outlet to transport moisture from an interior side of an envelope penetrating component positioned within the opening to an exterior side of a water separation plane.

Abstract: Aspects of the disclosure relate to building envelope assemblies including a structural wall frame, a water separation plane on an exterior side of the structural wall frame, an opening in the building envelope assembly and an envelope penetrating component positioned within the opening and secured to the structural wall frame. Additional aspects relate to a drain assembly that can be provided as part of the building envelope assembly or provided separately. The drain assembly incudes first and second plates, moisture inlet and outlet, a flexible sheet disposed between the first and second plates and extending between the moisture inlet and outlet and at least one seal formed between the moisture inlet and outlet, each seal adjacent the flexible sheet. The drain assembly is configured to transport moisture from the moisture inlet to the moisture outlet.