🏠 Insulation R-Value Converter
Convert thermal resistance values
R-Value (US)
19.00
ft²·°F·h/BTU
RSI (Metric)
3.346
m²·K/W
U-Value (US)
0.0526
BTU/ft²·°F·h
U-Value (SI)
0.2989
W/m²·K
📏 Estimated Thickness for R-19
Fiberglass Batts
5.9"
~R-3.2/inch
Cellulose
5.1"
~R-3.7/inch
Open-Cell Foam
5.3"
~R-3.6/inch
Closed-Cell Foam
2.9"
~R-6.5/inch
Rigid Foam Board
3.8"
~R-5.0/inch
🏠 Recommended R-Values by Climate Zone
| Location | Attic | Walls | Floor |
|---|---|---|---|
| Zone 1 (Hot) | R-30 to R-49 | R-13 to R-15 | R-13 |
| Zone 2-3 (Warm) | R-30 to R-60 | R-13 to R-15 | R-13 to R-19 |
| Zone 4-5 (Mixed) | R-38 to R-60 | R-13 to R-21 | R-25 to R-30 |
| Zone 6-8 (Cold) | R-49 to R-60 | R-20 to R-21 | R-25 to R-30 |