Dwell Development Columbia City Home Reaches Passivhaus Goal!
With a blower door test meter reading of 0.58 ACH50, Dwell Development's in-fill spec home located in their sustainable micro-community at Columbia Station achieved the rigorous Passivhaus standard.
2/26/13 6:00 PM CET
Last week's blower door test resulted in 0.58 ACH50, or .58 air changes per hour under 50 pascals of pressure. In comparison, a regular code home changes air about 7 x per hour under 50 pascals of pressure. Working with consulting and design practice Brute Force Collaborative, the construction of the home began in September 2012 as one of only a handful of in-fill spec projects seeking Passivhaus certification in the US, and the only one in the Pacific Northwest to date.
"We made the committment to building a Passivhaus on spec because we believe so strongly in creating energy efficient homes and keeping them affordable" stated Anthony Maschmedt, principal of Dwell Development. "its paying off now...the home pre-sold in November 2012, in the early framing stage of the project".
The first blower door test, which took place at the end of January, resulted in a reading of 1.62 ACH50. Remedies that brought in the successful reading included re-installing windows, reapplying the exterior waterproof air barrier, and taping or sealing tiny holes where joints meet. Tadashi Shiga of Evergreen Certified was the 3rd party verifier - he is the only verifier in Washinton State certified to verify Passivhaus.
See this 7-part series of short videos showing the events as they unveiled last week, here.