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N10 City DADU

A 270 sq. ft. Detached Accessory Dwelling Unit (DADU) constructed in side yard of Wallingford residence. Advanced framing, high R-value exterior wall insulation and full under-slab insulation, airtight building shell construction, recycled cabinets in kitchenette and bathroom. Standing seam metal roof with rainwater collection, permaculture and drought resistant gardening/landscaping are features of this building.
N10 City DADU

Location

Seattle, WA 98103

NW Homecrafters & WEdesign

A 270 sq. ft. Detached Accessory Dwelling Unit (DADU) constructed in side yard of Wallingford residence. Advanced framing, high R-value exterior wall insulation and full under-slab insulation, airtight building shell construction, recycled cabinets in kitchenette and bathroom. Standing seam metal roof with rainwater collection, permaculture and drought resistant gardening/landscaping are features of this building.

HouseLeaf

A Detached Accessory Dwelling Unit set in the side yard of a Wallingford property is an efficient and low home addition. Initial request for structure was to be simple, efficient and attractive. A single floor at 270 square foot gable roofed structure fulfilled the simple part of the request.

Efficiency is found in using advanced 2x6 framing for exterior walls, with blown-in fiberglass insulation in wall cavities. All exterior sheathing seams are taped with airtight tapes, and an airtight, vapor permeable building wrap applied over the sheathing. One inch of polyisocyanurate rigid insulation is applied over the building wrap with Hardi plank siding applied as finish. Exterior wall insulation values are calculated at around R-29. Trusses for gable roof are raised heal energy trusses allowing for full R-49 insulation in attic area using blow-in cellulose insulation. Slab-on-grade floor system is fully insulated with R-10 insulation under slab and R-10 insulation on exterior sides of footing, projected with cement board. Concrete for slab-on-grade used a 50% cement substitute of crushed slag, a up-cycled byproduct of steel smelting.

Interior cabinets for kitchenette and bathroom vanity cabinet are recycled from a local reuse store, along with the bathtub and many lighting fixtures.

Exterior landscaping is being installed by a permaculture trained landscaper using drought tolerant plantings and a small rainwater catchment system to harvest rainwater from the standing-seam metal roof atop the gable trusses.

Upon completion of drywall installation, a blower door test will be performed on the building to determine the amount and location of air leakage within the building envelope.

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