Park Passivhaus Plus
Park Passivhaus is completed in 2013 and certified as Passivhaus Plus with Passive House Institute (Darmstadt, Germany) in 2020. The home was constructed by a Boston-based Design/Build firm Placetailor and certified by yours truly.
Airtightness is 0.4 ACH50. Windows are triple pane, tilt and turn, imported from Europe. Heating and cooling are provided by a Mitsubishi mini-split heat pump. Domestic hot water is supplied by a Solar Thermal system and the whole house is ventilated with an HRV.
Since completion, the house is performing beautifully and above expectations. In 2016 a small 4.8kW solar photovoltaic system was added making the house Net Positive! Electric meter is spinning backwards when the panels are producing more than the house is consuming, which is the case through most of the year.
Check out the whole construction process on the Park Passivhaus Blog.
Single-family two storey home has ~1300 sqft of Treated Floor Area. Foundation is a combination of a stem wall and a shallow ring beam, separated by mineral wool. Walls are double studs with ~14.5" of dense packed cellulose. There are 2 smart membranes in the envelope - vapor open SIGA Majvest on the outside and SIGA Majpell 5 smart membrane on the inside with a low PERM rating to control diffusivity into the wall and open towards inside. Membranes and windows are all taped with SIGA tapes.