R-19 insulation is 6.25 inches thick
R-19 insulation has a nominal thickness of 6.25 inches and provides an R-value of 19 in thermal resistance. This insulation rating is commonly used in 2x6 wall cavities and attics where moderate insulation depth is needed. The actual thickness may vary slightly between manufacturers and insulation types.
R-19 insulation thickness by material type
- Fiberglass batts: 6.25 inches
- Rock wool batts: 6.25 inches
- Cellulose loose-fill: 7.5 inches (due to lower density)
Comparison with other R-values
| R-Value | Fiberglass Batt Thickness | Cellulose Loose-fill Thickness |
|---|---|---|
| R-13 | 3.5 inches | 4.75 inches |
| R-19 | 6.25 inches | 7.5 inches |
| R-30 | 9.5 inches | 11.75 inches |
Common applications for R-19 insulation
R-19 insulation works well in 2x6 exterior walls, floors over unheated spaces, and attic floors where building codes require moderate thermal resistance. It provides good energy efficiency for moderate climates without the depth requirements of higher R-value insulations.