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Spray foam
Also called: expanding foam, polyurethane foam
A foam filler that expands and hardens after you spray it, filling gaps and holes. Regular foam should not be used as a fire-stop filler.
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When you'd need this
- There's a draft around the hole where a pipe comes through
- I need to fill the gap around a door frame
Measure and check before you buy
- Can size
- Gun-type or straw-type
- Indoor or outdoor use
- Gap width and depth
- Low-expansion type for door frames or not
Safety: Caution: keep away from flames, wear safety glasses and gloves, and ventilate.