Flexible, precured dry intumescent strips used for concrete & masonry floor & wall joints up to 2? (51 mm) wide, duct insulation and up to 4? PVC/CPVC & membrane penetrations.Metacaulk Joint Strip expands when exposed to heat, forming a refractory char that tightly seals to prevent the spread of flames, smoke, and toxic fumes. It is easy to install with a single-sided application. Highly versatile and flexible, Metacaulk Joint Strip is also economical. It can be covered with any color of standard architectural caulk, and no firestop caulk is required.

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