Insulation Calculator
Calculate batts, rolls, or blown-in insulation needed for walls, attics, and floors.
Area to Insulate
feet
feet
Insulation Type
$
per bag/roll
Coverage
Total Area
-
Net Area (minus 6% framing)
-
Materials Needed
Rolls / Packages
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Insulation Tips
- Don't compress batts - compression reduces R-value
- Vapor barrier goes on the warm side (inside in cold climates)
- Attic ventilation is critical - don't block soffit vents
- Air sealing first - seal gaps before insulating for best results
- Wear protection - mask, goggles, long sleeves with fiberglass
- Check local codes - requirements vary by climate zone
Ad Space - 728x90
Recommended R-Values by Climate Zone (US)
| Zone | Attic | Wall | Floor |
|---|---|---|---|
| 1-2 (Hot) | R-30 to R-49 | R-13 to R-15 | R-13 |
| 3 (Warm) | R-30 to R-60 | R-13 to R-15 | R-19 |
| 4 (Mixed) | R-38 to R-60 | R-13 to R-21 | R-19 to R-25 |
| 5-6 (Cold) | R-49 to R-60 | R-13 to R-21 | R-25 to R-30 |
| 7-8 (Very Cold) | R-49 to R-60 | R-21 to R-49 | R-25 to R-30 |