Every house has a handful of spots traditional insulation misses - and they're usually the cold rooms you actually notice. Rim joists, cathedral ceilings, bonus rooms over garages, cantilevers and knee walls all share odd geometry or tight access that batt handles badly. Spray foam is built for exactly these.
The usual suspects
- Rim joists: a long run of gaps at the cold boundary - the leakiest band in the house.
- Cathedral / vaulted ceilings: little depth, high condensation risk.
- Bonus rooms over garages: cold from below, attic on three sides.
- Cantilevers (a floor that sticks out): exposed to cold on multiple sides.
- Knee walls: short attic-backed walls that batt leaves leaky.
Why foam wins here
Each is an air-seal-and-geometry problem, and spray foam air-seals while conforming to whatever shape it's sprayed into - no gaps, no fussy fitting. These awkward spots are where foam most clearly beats batt.
See rim joist, bonus room and ceiling pages. Get a quote.