Insulation Calculator

Proper insulation is critical for energy efficiency and comfort.

What this calculator does

R-13 is standard for 2×4 walls. R-19 for 2×6 walls. R-38 to R-60 for attics.

How it works

Add 10% for waste and cuts.

Frequently asked questions

What R-value should I use for exterior walls?

R-13 for 2×4 framing. R-19 to R-21 for 2×6 framing.