Great Stuff Window & Door Insulating Foam Sealant (12 oz) Review (2026)
By The DIYPicks Team · Updated July 2026
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- Drafty windows
- Drafty doors
- Air sealing
The right foam specifically for the gap between a window/door frame and its rough opening. Its low expansion is the whole point: it insulates without pushing the jamb out of square.
Pros
- Low-expansion formula seals frame gaps without bowing the jamb or binding the sash
- Stays flexible after curing so it tolerates the seasonal movement of window and door frames
- Dispenses in most orientations, making overhead and sideways frame gaps easier to fill
Cons
- Not for gaps over 1 in, so wide rough openings need backer rod or multiple passes
- Costs a bit more than the standard Gaps & Cracks version for the same can size
- Still cures sticky and permanent, so overfill mistakes are hard to clean up
Specifications
| Type | Polyurethane low-expansion foam |
|---|---|
| Expansion | Minimal/low expansion (window & door formula) |
| Cure | Tack-free ~20 min, trim in ~1 hr, full cure ~8 hr |
| Paintable | Yes, after full cure |
| Use | Gaps <1 in around window and door frames |