The petromat system, first introduced in 1966, extends the life of new asphalt pavement overlays. The petromat system consists of a non-woven polypropylene fabric which is field saturated with an asphalt cement tack coat. When placed between pavement layers, the petromat system becomes an integral part of the roadway section, forming a barrier to water infiltration and absorbing stresses to reduce reflective and fatigue cracking of the new asphalt surface layer. Challenge Asphalt has had tremendous success using the economical petromat paving system, especially as it improves pavement performance and lifespan of new residential asphalt pavement overlays, while reducing maintenance and lifecycle costs.