Table 1 Current insulation levels in existing single-family homes by census division [13] (batt insulation assumed for all).
From: The public health benefits of insulation retrofits in existing housing in the United States
| NE | MA | SA | ESC | WSC | ENC | WNC | MTN | PA | |
|---|---|---|---|---|---|---|---|---|---|
| Ceiling | R-30 | R-30 | R-11 | R-11 | R-11 | R-19 | R-19 | R-19 | R-1 |
| Above-grade wall | R-11 | R-11 | R-6 | R-6 | R-6 | R-11 | R-11 | R-11 | R-6 |
| Floor | R-13 | R-13 | R-3.4 | R-3.4 | R-3.4 | R-11 | R-11 | R-11 | R-5.5 |