any object built into a building frame to block a concealed hollow space through which a fire might pass from one part of the building to another.

1895–1900; Americanism; fire + stop Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
These penetrations should be protected with listed through-penetration firestop systems such as caulk or pillows.
Seal penetrations with listed through-penetration firestop materials.
All firestop materials and devices shall be from a single manufacturer.
Specialize in fastening systems and firestop products.
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