Insulation Calculator

Calculate batt, blown-in, and spray foam insulation needs

Batt Insulation

Blown-In Insulation

Spray Foam Insulation

Insulation Requirements

Primary Materials
0
Bags/Rolls
R-0
R-Value
thermal resistance
0
Coverage Area
sq ft
0"
Thickness
Coverage notes:
Fiberglass batts: ~40-90 sq ft per roll depending on R-value
Blown fiberglass: ~27 bags per 1000 sq ft at R-38
Cellulose: ~22 bags per 1000 sq ft at R-38
Spray foam: 1 board foot = 1 sq ft at 1" thick

R-Value Recommendations by Climate Zone

Location Attic Wall Floor
Zone 1-2 (Hot)R-30 to R-49R-13 to R-15R-13
Zone 3 (Warm)R-30 to R-60R-13 to R-15R-19 to R-25
Zone 4-5 (Mixed)R-38 to R-60R-15 to R-21R-25 to R-30
Zone 6-7 (Cold)R-49 to R-60R-21 to R-28R-25 to R-30
Zone 8 (Very Cold)R-49 to R-60R-21 to R-49R-25 to R-30