Where is fire mastic used?

Fire mastic, also known as fire-rated mastic or intumescent sealant, is used to seal gaps, joints and linear seals where fire resistance needs to be maintained. Common applications include construction joints in walls, perimeter gaps around fire-resistant building elements, and service penetrations where pipes, cables or other services pass through fire-rated walls and floors. Fire-stopping mastics help restrict the spread of fire, smoke and hot gases through these openings. Always use a tested and certified fire-stopping system that is suitable for the specific application and construction type, and refer to the relevant certification and installation guidance before use.