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Ceiling joints between panels and grid members are potential weak points in fire barriers. Proper joint treatments ensure continuity under fire exposure. Intumescent strips insert into gaps; they expand on heating to fill voids. Fire-rated mastics seal smooth seams and maintain adhesion under thermal stress. In larger openings—around access panels or penetrations—fire collars or perimeter trims incorporate intumescent materials and gaskets that swell, closing gaps. Some systems employ neoprene-backed graphite seals that resist smoke infiltration. All joint treatments must be tested with the complete ceiling assembly; manufacturers define maximum joint widths (often 2–4 mm) and sealant thickness. Consistent application per guidelines ensures that the ceiling maintains its integrity (E) and insulation (I) rating throughout a fire event.