The NSI FireStop814™ is a high-performance firestop caulk designed for both residential and commercial applications, offering a reliable barrier against flames, smoke, and toxic gases. Engineered for ease of use and superior adhesion, this single-component, non-combustible and non-intumescent sealant is ideal for sealing annular spaces around wires, pipes, and conduits in 1- and 2-hour fire-rated assemblies.