January 10, 2014: This issue came up because of the Canadian codes. Two folks called me recently about requiring an engineer-sealed letter with respect to insulating sheathing and spray foam. And I said “you’re kidding, I thought we solved this years ago.” And the answer was that apparently the building science community solved it but it never got memorialized in Part 9 of the Canadian code. So the best-performing walls and best-performing roofs are not available to the average Canadian home builder without having to go to a licensed engineer or a licensed architect. That’s just plain wrong.
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