For fire rated connections, is fire caulking always necessary?

The use of fire caulking is up to the discretion of the designer.
In a tight concealed connection, fire caulking may not bring any additional fire resistance. It is generally accepted that a connection with a gap between the two elements smaller than 1/16” [2 mm] may be considered a tight connection. As fire caulking was used in the full-scale fully loaded fire test, using fire caulking is very likely to help ease the approval process with local building authorities. The fire caulking used in our fire testing was the Hilti FS-ONE.
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Relevant Technical Resources

Gallery design guide   beam hanger   usa   cover American Beam Hanger Design Guide

Products Covered in this Article

Gallery gigant system GIGANT
Gallery megant system MEGANT
Gallery ricon s vs cover picture explosion RICON S VS
Gallery walco v system WALCO

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