Great Stuff Gaps & Cracks vs Window & Door Foam?
By The DIYPicks Team · Updated July 2026
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Great Stuff Gaps & Cracks Insulating Foam Sealant (12 oz)
The go-to high-expansion foam for sealing large gaps, rim joists, and wiring/plumbing penetrations. Use it anywhere except tight window and door frames, where its expansion can distort the jamb.
| Type | Polyurethane expanding foam (closed-cell) |
|---|---|
| Expansion | High expansion, fills gaps up to 3 in |
| Cure | Tack-free ~20 min, cut/trim in ~1 hr, full cure ~8 hr |
| Paintable | Yes, after full cure (sand first) |
| Use | Gaps and cracks up to 3 in, indoor/outdoor |
Great Stuff Window & Door Insulating Foam Sealant (12 oz)
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.
| 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 |
Our verdict
The single deciding factor is where the gap is. Gaps & Cracks is a high-expansion, closed-cell foam that fills voids up to about 3 inches, making it ideal for rim joists, penetrations, and large openings, but its aggressive expansion can bow a window or door jamb and jam the sash. Window & Door is a low-expansion formula built for exactly that risk: it seals the gap between a frame and its rough opening without distorting the jamb. Rule of thumb: use Window & Door anywhere near an operable window or door, and Gaps & Cracks for everything else. They cost about the same, so keep both on the shelf.