cat or other blocking place in walls to prevent a flue effect. Cement or metal firestops are occasionally required by some building code.
Wood blocking, usually 2X4, used to retard the spread of fire, and installed between studding. Required by building codes in some areas, expecially for ballon framing.
Any solid object used to block airways between walls to prevent smoke and fire from spreading.
a special seal designed and tested to restore the fire integrity of the barrier
a through-penetration firestop is a specific construction consisting of all materials that fill the opening around penetrating items such as cables, cable trays, conduits, ducts, and pipes and their means of support through the wall or floor to prevent the spread of fire. (ASTM)
A material, device, or assembly of parts in an architectural barrier to prevent vertical or horizontal passage of flame, smoke, water, or gases through the rated barrier.
fire-retardant element inside walls and floors. Especially horizontal wood member between studs to stop updrafts inside wall.
A firestop is a passive fire protection system of various components used to seal openings in fire-resistance rated wall and/or floor assemblies through bounding, which is based on elaborate fire testing as well as environmental testing, in some cases.