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This Swiss Company Builds Houses Insulated with Wood

R24 and great fire ratings

By Rain Noe - December 20, 2023

in Architecture

On an industry tour through Switzerland, American construction pros Matt Risinger and Jordan Smith visited homebuilder Kung Holzbau. The company builds timber homes that are free of adhesives and metal fasteners; they use those wooden nails we wrote about.

And amazingly, the insulation is just…wood. A lot of wood. As in, six to twelve layers of 5/4 boards, yielding walls up to 16" thick that deliver an R-value of 24. On top of that, Kung Holzbau's houses have 90-minute fire ratings, versus the 30-60-minute ratings common in America.

Kung Holzbau's website is all in German, but helpfully Risinger and Smith run down the company's processes here in English:

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