Why Tri-Ply® Ply 4?
High tensile strength and a high degree of dimensional stability results in a roof system with greater resistance to splitting and cracking. Optimum porosity of the felt provides ready escape of air while allowing proper asphalt penetration at the time of mopping, and the asphalt coating provides a high degree of moisture resistance.
Tri-Ply® Ply 4 is used as a ply felt in the construction of built-up roofs. It is designed for use in all climate zones and is appropriate for use as a base sheet, ply felt, and in the construction of flashing membranes.