history

Joseph Lstiburek Surprises Passive House Conference Attendees

Posted on April 25,2015 by ab3 in air leakage

At the 2012 Passive House Conference in Denver, Dr. Joseph Lstiburek gave the keynote address for the opening plenary (or plenum, as Henry Gifford would say) session. His words, clever as always, added some nice historical perspective to what the Passive House folks are doing but also caught some people off guard. Read on, and I'll tell you more about that.

All About Larsen Trusses

Posted on April 25,2015 by user-756436 in double stud

A Larsen truss is a type of wall truss used to build a thick wall — thick enough to provide room for above-average amounts of insulation. It was developed in 1981 by John Larsen, a builder in Edmonton, Alberta. In honor of the 30th anniversary of the Larsen truss, the time has come for a definitive article on the invention. This report includes an interview with the inventor of the Larsen truss, a history of its use, and a discussion of its advantages and disadvantages.

The History of Superinsulated Houses in North America

Posted on April 25,2015 by user-756436 in Dumont

Several GBA readers have requested a copy of a presentation on “The History of Superinsulated Houses in North America” that I gave at the 14th Annual Westford Symposium on Building Science (August 3, 2010). I also gave the presentation at the annual meeting of the British Columbia Building Envelope Council in Vancouver (September 22, 2010). Here it is: The History of Superinsulated Houses in North America For more on the topic, check out two blogs with overlapping content:

Solar Versus Superinsulation: A 30-Year-Old Debate

Posted on April 25,2015 by user-756436 in active solar

The oil price shock of 1973 sparked a burst of interest in “solar houses.” During the 1970s, owner-builders all over the U.S. erected homes with extensive south-facing glazing — sometimes sloped, sometimes vertical. Many of these houses included added thermal mass — concrete floors, concrete-block walls, or 55-gallon drums filled with water.

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