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.  To read the article in full click here.