Metacaulk® Joint Strip is a flexible, highly intumescent firestop material used in concrete and masonry control joints up to 1" wide. It forms a strong char that prevents the passage of flame, smoke and hot gases between control joints. Metacaulk® Joint Strips are ideal for stadium construction, tilt up panels, curtain wall panels and all vertical concrete and masonry construction joint applications where a fire rated control joint is required. Complies to Required Environmental Exposure Testing of Accelerated Aging and High Humidity as per UL 1479 Fire Test of Through-Penetration Firestops.