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A firestop is a fire protection system made of various components used to seal openings and joints in fire-resistance rated wall and/or floor assemblies. For penetrating cables, these can also be called as Multi Cable Transits (MCTs). Firestops are designed to restore the fire-resistance ratings of wall and/or floor assemblies by impeding the spread of fire by filling the openings with fire-resistant materials. Unprotected openings in fire separations cancel out the fire-resistance ratings of the fire separations, allowing the spread of fire, usually past the limits of the fire safety plan of a building. == Opening types == * Electrical through-penetrations * Mechanical through-penetrations * Structural through-penetrations * Unpenetrated openings (openings for future use for example) * Re-entries of existing firestops * Control or sway joints within fire-resistance rated wall or floor assemblies * Junctions between fire-resistance rated wall or floor assemblies * "Head-of-wall" (HOW) joints, where non-loadbearing wall assemblies meet floor assemblies File:Test_in_flight.jpg|Fire test of mortar based firestop File:Sl_silicone_pipe_covering.jpg|Mechanical pipe with metallic piping through-penetrations in a 2-hour concrete floor slab File:Stuffed rockwool firestop.jpg|Inadequate attempt at firestop using rockwool alone File:Penetrations_through_firestop.svg|Typical construction drawing of a firestop File:Mortar_tag.jpg|Firestop mortar seal of an electrical cable tray 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「firestop」の詳細全文を読む スポンサード リンク
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