Firestop Mortar
This information reflects our best understanding of product composition in 2022.
Firestop mortars are typically used to seal through penetrations, construction gaps, and other openings in concrete or masonry assemblies. While products may be used to seal any sized opening, they are often used to seal medium to large openings...
Firestop mortars are typically used to seal through penetrations, construction gaps, and other openings in concrete or masonry assemblies. While products may be used to seal any sized opening, they are often used to seal medium to large openings around electrical power cables, pipes, and communication cables. Firestop mortars typically consist of a dry powder that is mixed with water prior to application. They are commonly red in order to be easily identifiable during inspections. Mix ratios vary allowing the products to be poured, troweled, or pumped. In addition, some products may be spray-applied. Firestop mortars commonly are based on portland cement and expanded perlite. Perlite acts as an insulator and also allows the mortar to be lighter than standard mortars. While vermiculite may be used to impart similar properties to perlite in firestop mortars, it was not identified in any products surveyed for this Common Product record.