Insulation R-Value Calculator Guides
Learn how to calculate insulation R-values, check IECC 2021 code compliance, and choose the right materials.
Whether you are building a new home, renovating, or just checking if your insulation meets code, these guides walk you through the key concepts.
Complete Guide
Complete guide to R-value calculation, thermal bridging, and IECC 2021 code compliance checking
Read the Guide →Quick Guides
IECC 2021 Insulation Requirements by Climate Zone
Complete lookup table of minimum R-values for walls, ceilings, floors, and basements under the 2021 International Energy Conservation Code
View Guide →
Attic Insulation R-Value Guide
How much attic insulation you need, the best materials, and how to meet IECC 2021 ceiling requirements
View Guide →Ready to Calculate?
Build your insulation assembly, check R-value compliance, and get material recommendations.
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