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Definition of Firestop
1. Noun. (construction) Any of a number of materials, such foam, batting, or wooden blocks, built into the interior of a wall in order to inhibit the spread of fire, in North America most commonly taking the form of 16-inch pieces of 2x4 affixed horizontally in each of the spaces between the vertical studs within a wall. ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of Firestop
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