Description
Johns Manville R-19: Garage Walls, Bonus Rooms and 2×6 Framing
The wall between your house and an attached garage is an exterior wall in everything but name: in a Southern California summer the garage can run 20 or more degrees hotter than the house. If that wall is 2×6, Johns Manville R-19 kraft-faced batts fill it at full depth. The same batt works for 2×6 exterior walls in additions and for floors over crawl spaces.
Specifications
| Brand | Johns Manville |
|---|---|
| R-value | R-19 |
| Material | Formaldehyde-free fiberglass |
| Thickness | About 6¼ in. |
| Facing | Kraft paper vapor retarder |
| Coverage | About 75 sq ft per bag (confirm on bag) |
Where to Use It
- House-to-garage walls (2×6), facing toward the house.
- 2×6 exterior walls in additions, ADUs and remodels.
- Raised floors over crawl spaces, facing up.
Installation Tips
- Split batts around wiring instead of stuffing them behind it.
- Cut neatly around outlet boxes; gaps are where most wall heat loss happens.
- Cover kraft facing with drywall; it must not be left exposed.
Buy It or Have It Installed
Order JM R-19 here, or let our licensed team (CSLB #1139733) insulate walls, floors and crawl spaces across Los Angeles, Orange County and Las Vegas. Need sound control too? See soundproofing insulation.
Johns Manville R-19 Kraft-Faced Fiberglass FAQ
- Should I insulate the wall between my house and garage?
- Yes. An attached garage gets far hotter and colder than the house, so that wall should be insulated like an exterior wall.
- Is Johns Manville R-19 formaldehyde-free?
- Yes. Johns Manville markets its residential fiberglass batts as Formaldehyde-free.
