Description
CertainTeed R-30: Attics, Bonus Rooms and Floors Over Garages
Rooms over a garage are the hot-and-cold complaint we hear most often in Orange County and Los Angeles homes. The floor between that room and the garage is usually under-insulated, and R-30 kraft-faced batts are the standard fix. The same batt is a solid attic-floor choice in coastal neighborhoods where R-30 is the target value.
Specifications
| Brand | CertainTeed |
|---|---|
| R-value | R-30 |
| Material | Fiberglass with plant-based binder |
| Thickness | About 10 in. |
| Facing | Kraft paper vapor retarder |
| Certifications | GREENGUARD Gold |
| Sold by | Bag. Coverage depends on width; confirm when ordering |
Where to Use It
- Floors over garages: install between the floor joists with the kraft facing up, against the subfloor of the heated room.
- Attic floors in coastal climate zones, facing down toward the living space.
- Cantilevered floors and bonus rooms over unconditioned space.
Good to Know
- In floors, support batts with wire insulation supports so they stay in full contact with the subfloor.
- Kraft facing is combustible; in garages it must be covered by drywall.
- Fill cavities completely; gaps cut effective R-value sharply.
Buy It or Have It Installed
Pick up CertainTeed R-30 for your project, or have our team (CSLB #1139733) insulate your floors or attic. We serve Los Angeles, Orange County, the Inland Empire and Las Vegas. Compare all R-30 fiberglass insulation.
CertainTeed R-30 Kraft-Faced Fiberglass FAQ
- Which way does the facing go when insulating a floor over a garage?
- Up, against the underside of the heated room's subfloor. The vapor retarder always faces the conditioned space.
- Can R-30 batts be left exposed in a garage ceiling?
- No. Kraft facing is combustible and must be covered, typically with drywall.
