This post first appeared on the Green Building Advisor Website.
I’ve been working on a future article for Green Building Advisor that has a working title of “Problems with Attic Trusses”. During research for the piece, I found myself reviewing the ratio rules for hybrid roof insulation strategies. GBA has two really good articles on the topic:
Combining Exterior Rigid Foam With Fluffy Insulation – GreenBuildingAdvisor by Martin Holiday
The Ratio Rule for Hybrid Roof Insulation – GreenBuildingAdvisor by Allison Bailes
Continue reading “A 2021 IRC Code Oversight Could Lead to a Risky Roof Assembly”