ZeroCottage

Zero Cottage: San Francisco's First Net Zero Passive House

1 note &

Finishing the exterior system continues with placement of the 2” of XPS foam on the exposed exterior walls. This insulation is installed outside the Perm-A-Barrier membrane and will (theoretically) prevent moisture condensation inside the wall cavity as it moves the “dew point” outside the wall. It will be wrapped with “Green Guard” building paper, mainly to protect the foam from UV degradation.  Vertical 1x4 battens of composite wood, Hardy Trim, will go on top of that to mount the clips for the interchangeable metal shingle rain-screen system.

Filed under passive house super insulation styrofoam XPS passivhaus

1 note &

The triple glazed Sorpetaler windows are being installed now. The frames are taped tight to the exterior Grace membrane after being held in place with thin plywood tabs (replacing the thermal bridge steel tabs supplied with the windows). The exterior trim is screwed to the frame on top of the tape. It’s made of FSC Machiche, a super durable tropical hardwood. This is proving to be a challenge due to the variations in the Machiche. Next time I would go with a metal fin.

1 note &

Salvaged Pasta-Factory Floor

A couple of years ago we renovated an abandoned pasta factory in Oakland into affordable housing. This is part of a larger project for the Oakland Housing Authority called Tassafaronga Village - www.dbarchitect.com/Tassafaronga.

It had a beautiful wooden floor that had to be removed to install a shear diaphragm.  The contractor removed the flooring and gave us some which we put into storage. 

Factory Floor

The floor has to be carefully sorted before being diagonal nailed down. The goal is to finish it in a minimal way so that it shows some of the evidence of it’s history.  

nailing down the floor

0 notes &

December 10th: The framing is topped out to the roof, including the south facing monitor to provide solar gain. The black membrane on the wall is Grace Perm-A-Barrier.  It’s stuck to the sheer ply to form a super tight moisture and air barrier. 2” of XPS foam insulation will go on over it, then the green super building paper, then the rain-screen system.

December 10th: The framing is topped out to the roof, including the south facing monitor to provide solar gain. The black membrane on the wall is Grace Perm-A-Barrier.  It’s stuck to the sheer ply to form a super tight moisture and air barrier. 2” of XPS foam insulation will go on over it, then the green super building paper, then the rain-screen system.

1 note &

Keeping Zero Cottage on track for Passivhaus  (and Greenpoints Rated and LEED for Homes Platinum) is Prudence Ferreira of Integral Impact. She and her team have done a great job. Soon we’ll do a “blower door” test for our extreme air infiltration goals.

Keeping Zero Cottage on track for Passivhaus (and Greenpoints Rated and LEED for Homes Platinum) is Prudence Ferreira of Integral Impact. She and her team have done a great job. Soon we’ll do a “blower door” test for our extreme air infiltration goals.