Product Catalog

J-Block products are composed of non-toxic incombustible materials whose air permeability and relative fire resistance characteristics are unequaled. FULLY APPROVED FOR CONSTRUCTING VENTILATION DEVICES BY MSHA, J-Blocks cover the area of 3 normal concrete blocks and are easily cut to size with a handsaw. A typical brattice stopping is dry stacked using alternating courses and then sealed with an approved sealant about the roof, rib, and seams.