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Joint (building)
A building joint is a junction where building elements meet without applying a static load from one element to another. When one or more of these vertical or horizontal elements that meet are required by the local building code to have a fire-resistance rating, the resulting opening that makes up the joint must be firestopped in order to restore the required compartmentalisation.
==Qualification requirements==
Such joints are often subject to movement, as a function of the building's design basis. For a sample certification listing indicating fire tested motion, (click here. ) Firestops must be able to demonstrate the ability to withstand operational movement prior to fire testing. Firestops for such building joints can be qualified to (UL 2079 -- Tests for Fire Resistance of Building Joint Systems ).
Whether or not the building elements forming the joint have a fire-resistance rating, the joint design must still consider the anticipated operational movement of each joint. Timing is also important, as freshly poured concrete shrinks 〔 〕 particularly during the first few months of a new building, potentially causing joint size changes.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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