Asphalt comes in many different grades, which have distinct compositions and will endure varying levels of use. Typically, driveway installation will include the applying of levels of not less than two asphalt grades. Foundation I-2 is the most common initially layer and is mostly produced up of gravel. Concrete highway https://asphaltrepairs09764.wikinewspaper.com/3149071/new_step_by_step_map_for_repair