ENERGY EFFICIENCY LAB HOME ABOVE-GRADE WALL R The above-grade wall mock-up studies the details associated with properly Roof Rake-to-Wall installing windows, doors, and exterior Intersection cladding and finishes in order to maintain • Two layers of housewrap applied the integrity of the home’s air barrier and at intersection drainage plane. By building this mock- • Outer layer overlaps step flashing up, key constructability issues were to serve as drainage plane uncovered and then resolved long before • Inner layer continuous behind work on the lab home began onsite. roof framing and flashing to These issues included how to install and maintain integrity of air barrier flash windows and doors to the exterior face of 2” of continuous insulating sheathing, how to properly size the Furred Trim rough openings in the wall framing with • Polyurethane foam trim at head durability and air sealing requirements of window furred to enable vinyl in mind, and how to detail a roof rake-to- siding to pass behind it wall intersection without compromising • Makes installation easier by the exterior air barrier. eliminating complex cuts Window Flange • Back-caulked at head and jambs Door Head prior to installation • Flashing tape applied against • Flashing tape applied over flanges foam sheathing at head and jambs to create • Primary drainage plane watertight and airtight transition layered over flashing tape from housewrap to window • Flashing tape transitions drainage plane from housewrap to door Door Flange Extended Frame Exterior-Mounted • Dual-sided, self- Housewrap • Door has extended frame and adhered flashing Window threshold due to thicker than material provides Seams normal walls • Window mounted to reliable moisture seal • Horizontal and exterior surface of wall • Wall thickness is 10-5/16”, not • Flashing material vertical seams in assembly counting exterior finish creates a flange on housewrap layered • and taped Mounted using 4” • Door is inset to interior of brick mould around screws fastened wall, reducing its exposure door, which can • Create continuous through 2” of foam to elements and preventing be integrated with air barrier at sheathing back to wall swing issues building envelope exterior walls framing.