Affordable Passive House

Custom-manufactured polystyrene served as the form system for the home's 8-inch reinforced "raft slab." The pieces were factory-cut with interlocking profiles.

A taper that serves as a draining wing insulation.

The crew assembled the insulated forms on site using PUR Stick adhesive.

The crew assembled the insulated forms on site using PUR Stick adhesive.

A carefully compacted bed of crushed stone provided a flat sub-base for the insulation directly under the slab.

A sheet of 10-mil poly, which acts as an air and vapor barrier and a capillary break, was laid on top of the EPS.

All seams and penetrations were sealed with 3M flashing tape.

Steel rebar and wire mesh were supported on dobies cut from insulation scraps.

Because it is also the finished floor, the slab was meticulously power-troweled smooth and flat.

To protect the poly air barrier, the crew rolled out sill seal.

After the sill seal, the crew stood the conventionally framed inner 2x4 support walls.

The walls were anchored to the slab.

The drilled holes were sealed with spray foam.

Making sure that the entire building envelope was meticulously air-sealed.

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