Insulation Recommendations
North Carolina energy code minimum
insulation levels:
(Note: Trade-offs are required by N. C. Code if a component R-value falls below minimum.) All components must be installed to comply with manufacturers and N. C. model energy code specifications.
| |
NC Building Code Mountains
Zone 11
|
NC Building Code
Foothills
Zones 8 & 9 |
| Floor |
R-19 |
R-19 |
| Band-joist cavity |
R-19 |
R-19 |
| Wall |
R-19 (R-16 min.) |
R-14 |
Log Wall
20 lb./sq. ft. |
R-9 |
R-9 |
| Ceiling |
R-38 |
R-30 |
| Slab |
R-5
Heated slab: R-7 |
R-5
Heated slab: R-7 |
Windows - Double pane or double pane with Low-E glazing - Note: square footage must not exceed code specifications for applicable zone.
Doors - metal insulated or wood with weather-stripping and storm door.
Headers - Insulate rim joist spaces that will be inaccessible after the subfloor is installed.
- Insulate all exterior window and door headers using rigid insulation board or unfaced fiberglass insulation.
- Insulate all exterior wall T-posts and corner posts prior to installing wall sheathing.
- Install insulation board on dormer sidewalls and knee walls prior to roof framing.
- Check ceiling insulation and make sure it is in contact with the top plate and sheetrock to avoid thermal bypasses.
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