There are over 60 insulation manufacturers in the U.S. and Canada. More than 11 different cavity insulation types. Hundreds of ways to build a wall — and nobody shows you how they actually compare. So people guess. Or they buy whatever the last salesperson pitched. That never sat right with me. I’ve spent decades designing and testing wall assemblies, and I finally built what I always wished existed — a single reference where every wall is calculated the same way, apples to apples. Same wall siz

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