TRI-PLY ® #75 Base Sheet Description Tri-Ply® #75 Base Sheet is a premium roofing base sheet constructed with a strong glass mat that is coated on both sides to ensure a closed-sheet design to prevent asphalt bleed-through. The sealed sheet also serves as an effective flame retarder for the application of torch-applied modified bitumen membranes. Uses Tri-Ply® #75 Base Sheet is engineered for use in the construction of Tri-Ply® built-up and modified bitumen roofs.
