Stone Mason Fire Block is a non-combustible sealant designed to seal fire rated service penetrations and construction joints in horizontal and vertical fire separations. Ideal for use around wires, pipes, duct work and vents in wood or steel framed non-rated construction, as well as fireplaces, furnaces, and chimneys. This water based repair mortar and sealant meets ASTM E-136 requirements to resist smoke and temperatures up to 2000°F. Adheres well to wood and most common masonry materials.

The consumer shall satisfy themselves of the suitability of this product for the intended purpose. Weather, applicator's skill and surface conditions are beyond manufacturer's control. We, therefore, limit our liability to replacement of defective material only, within one year of proof of purchase.