Posted on September 23, 2014 by Martin Holladay, GBA Advisor
I'm in Portland, Maine, for the North American Passive HouseA residential building construction standard requiring very low levels of air leakage, very high levels of insulation, and windows with a very low U-factor. Developed in the early 1990s by Bo Adamson and Wolfgang Feist, the standard is now promoted by the Passivhaus Institut in Darmstadt, Germany. To meet the standard, a home must have an infiltration rate no greater than 0.60 AC/H @ 50 pascals, a maximum annual heating energy use of 15 kWh per square meter (4,755 Btu per square foot), a maximum annual cooling energy use of 15 kWh per square meter (1.39 kWh per square foot), and maximum source energy use for all purposes of 120 kWh per square meter (11.1 kWh per square foot). The standard recommends, but does not require, a maximum design heating load of 10 W per square meter and windows with a maximum U-factor of 0.14. The Passivhaus standard was developed for buildings in central and northern Europe; efforts are underway to clarify the best techniques to achieve the standard for buildings in hot climates. Network conference. Yesterday morning I walked a few blocks from my hotel to the conference site, through downtown Portland.
The old commercial district here has lots of handsome old three-story and four-story brick buildings. I love to look at the details on these older buildings. At first glance, it may appear that architectural ornament has been randomly applied to these façades; but if one pays attention, it soon becomes clear that most of these façade elements have a function.