Roofing Surfacing Mat Roofing surfacing mat is mainly used as substrates for water-proof materials. The longitudinal strength and tear resistance canbe improved further by incorporating reinforcements into the mat across its whole width. perforated mat is also available when the mat comes out from a particular punch process. Application : Roofing surfacing mat as an ideal substrate material for asphalt roofing rolls and shingles. C-DH mat can also act as the lining for roof insulation layers to protect polymer foam insulation from the damaging effect caused by chemical solvents in bitumen so as to prolong the lifetime of heat insulation layer.