Joints between Walls and Floors, Ceilings and Roof
Joints created between building components to accommodate expected building movement caused by thermal expansion and contraction, seismic activity, wind or other loads, may create an opening that will compromise the fire resistance rating of a building unless the joints are properly sealed. Joints between fire resistance rated walls, floors, ceilings and roofs are required to be protected by an approved joint system to resist the passage of fire for a time period not less than the fire resistance rating of the wall, floor, ceiling or roof where the joint occurs. The fire resistant joint system must be tested in accordance with UL 2079 (ASTM E 1966). Joints that do not exceed 5/8“ in width are permitted to be tested in accordance with ASTM E 119, the standard fire test for building construction. The system must be securely installed in accordance with the manufactures instructions so as not to loosen and the system must be able to accommodate expected building movement. Joints that occur in areas that are otherwise open, such as shaft enclosures, atriums, mezzanine floors, etc. are not required to be protected by a fire resistant joint system.