Creve Coeur Paving has created its very own base design. This design is called Perma-Base. Perma-Base is the result of years of researching pavement defects. Most pavement defects are caused by underlying base issues. A weak or unstable base will compromise the integrity of asphalt surfaces. Have you ever noticed the amount of skin patches being installed on commercial surfaces that are less than 3 years old? Asphalt pavement should be able to last at least 5 years without defect as long as the base rock is designed and installed properly.