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A building envelope assembly including a first structural wall frame, a flexible sheet, a drain assembly, and a seal. The flexible sheet is disposed along a surface of the first structural wall frame. The flexible sheet configured to transport moisture along two opposing surfaces. The flexible sheet

A building envelope assembly including a first structural wall frame, a flexible sheet, a drain assembly, and a seal. The flexible sheet is disposed along a surface of the first structural wall frame. The flexible sheet configured to transport moisture along two opposing surfaces. The flexible sheet includes an upper portion and a bottom portion having a moisture wicking sheet. The drain assembly is configured to receive moisture from the flexible sheet. The seal is attached to the bottom portion of the flexible sheet and is configured to prevent ingress of water, water vapor, and air toward the upper portion of the flexible sheet.

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1. A building envelope assembly comprising: a first structural wall frame;a flexible sheet disposed along an interior surface of the first structural wall frame, the flexible sheet configured to transport moisture along two opposing surfaces, the flexible sheet including an upper portion and a botto

1. A building envelope assembly comprising: a first structural wall frame;a flexible sheet disposed along an interior surface of the first structural wall frame, the flexible sheet configured to transport moisture along two opposing surfaces, the flexible sheet including an upper portion and a bottom portion having a moisture wicking sheet;a drain assembly configured to receive moisture from the flexible sheet; anda seal attached to the bottom portion of the flexible sheet and configured to prevent ingress of water, water vapor, and air toward the upper portion of the flexible sheet. 2. The building envelope assembly of claim 1, wherein the drain assembly comprises a sealing cavity, a transfer cavity, and a drain cavity. 3. The building envelope assembly of claim 2, wherein the seal is disposed within the sealing cavity on opposing sides of the flexible sheet. 4. The building envelope assembly of claim 2, wherein the flexible sheet terminates within the transfer cavity. 5. The building envelope assembly of claim 1, wherein the drain assembly includes a removable top member. 6. The building envelope assembly of claim 1 comprising: a second wall frame parallel to the first structural wall frame; andan insulation layer disposed between second wall frame and the flexible sheet. 7. The building envelope assembly of claim 6 comprising: a top cap configured to retain a top portion of the flexible sheet and extend along a top edge of the insulation layer and the second wall frame. 8. The building envelope assembly of claim 6, wherein the insulation layer is non-permeable board insulation, and wherein the flexible sheet includes protrusions extending toward the first structural wall frame, and moisture is transported along an exterior surface of the flexible sheet. 9. The building envelope assembly of claim 6, wherein the insulation layer is spray foam insulation, wherein the flexible sheet includes protrusions extending toward the insulation, wherein a nylon mesh and a rayon staple are adhered to the protrusions, and wherein moisture is transported along an interior surface only of the flexible sheet above a bottommost protrusion and along both the interior surface and an exterior surface of the flexible sheet below the bottommost protrusion. 10. The building envelope assembly of claim 6, wherein the insulation layer is spray foam insulation, wherein the flexible sheet includes protrusions extending toward the insulation and toward the first structural wall frame, wherein a nylon mesh and a rayon staple are adhered to the protrusions extending toward the insulation, and wherein moisture is transported along an interior surface and an exterior surface of the flexible sheet. 11. A building envelope assembly comprising: a structural wall system;a drain assembly including a bottom plate, a face plate extending perpendicular from the bottom plate, a sealing cavity, a transfer cavity fluidly connected to the sealing cavity, and at least one drainage cavity fluidly connected to the transfer cavity;opposing sealing members assembled in the sealing cavity; anda concrete slab abutting the structural wall system;wherein the bottom plate is disposed along a bottom surface of the concrete slab and the at least one drain cavity extends through a thickness of the concrete slab. 12. The building envelope assembly of claim 11, wherein the structural wall system is subterranean. 13. The building envelope assembly of claim 11, wherein a vapor retarder is installed below the concrete slab and wherein the bottom plate is sealed to the vapor retarder. 14. The building envelope assembly of claim 11, wherein the drain assembly includes a removable cap. 15. The building envelope assembly of claim 11 comprising: a flexible sheet disposed along an interior side of the structural wall system, the flexible sheet including a moisture wicking sheet along a bottom portion of the flexible sheet, the flexible sheet configured to transport moisture along the opposing faces and into the drain assembly, wherein the bottom portion extends between the pair of sealing members and terminates within the transfer cavity. 16. The building envelope assembly of claim 15 comprising: a nylon mesh and a rayon sheet adjacently disposed along an interior face of the flexible sheet. 17. A building envelope assembly comprising: a structural wall system;a drain assembly including a bottom plate, a face plate extending perpendicular from the bottom plate, a sealing cavity, a transfer cavity fluidly connected to the sealing cavity, and at least one drainage cavity, fluidly connected to the transfer cavity;opposing sealing members assembled in the sealing cavity;a second wall system parallel to the structural wall system; anda flexible sheet disposed between the structural wall system and the second wall system and configured to transport moisture from between the structural wall system and the second wall system. 18. The building envelope assembly of claim 17, wherein the second wall system includes an insulation layer disposed adjacent to the flexible sheet. 19. The building envelope assembly of claim 1, wherein the drain assembly is configured to direct fluid toward an exterior surface of the first structural wall frame. 20. The building envelope assembly of claim 17, wherein the structural wall includes weep holes and the face plate extends and terminates below the weep holes. 21. The building envelope assembly of claim 17, further including a waterproofing membrane extending between the bottom plate and the concrete slab and the face plate and the structural wall system. 22. The building envelope assembly of claim 21, wherein the waterproofing membrane is mechanically attached to at least one of the concrete slab and the structural wall system.