Building a Simple Passive House, Images 9-17

Insulated headers supported by metal connectors are a hallmark of OVE framing.

Though framed with less lumber, the shell meets West Coast seismic requirements.

To eliminate air leakage at the ridge, the crew installed blocking between the rafters, sealing it to the framing with spray foam.

The blocks were ripped so they could be caulked into place, bearing solidly on the glulam beam and matching the angle of the rafters to provide a caulkable nailing surface for the sloped ceiling drywall.

To air-seal the 1/2-inch sheathing to the framing as it was installed, one carpenter laid beads of foam on the framing edges while another followed with a nail gun.

The plywood seams on both the walls and the roof were further sealed with drywall tape and duct mastic.

High-solar-gain glazing was used on the south elevation and low-gain glazing on the other sides; U-values range from 0.14 to 0.19.

Inside, the units were sealed to the rough opening with spray foam.

The units were surrounded with a thermal break of rigid foam. Later, the drywall was returned into the opening and finished with corner bead.

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