A material or system installed in gaps and openings in buildings to prevent fire and smoke from spreading between rooms or floors.
Compound of 'fire' and 'stop' (Old English 'stoppian'), a modern architectural and safety term that emerged with 20th-century building codes.
Firestop materials are usually silicone-based compounds that actually expand when exposed to fire, sealing gaps—it's like a chemical barrier that only activates during the emergency it was designed to prevent!
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