Construction
Insulation R-Value Calculator
What R-value do you need, and how thick is that in fiberglass or spray foam?
FAQ
What zone am I in? +
The DOE has a climate zone map (search 'IECC climate zone map'). Most of the US sits in zones 3–6.
What's R-value? +
A measure of resistance to heat flow. Higher = better insulator. The IECC sets minimum R-values by climate zone and assembly type.