Asphalt is derived from crude oil, a non-renewable fossil fuel rich in carbon. The fact that asphalt is oil-based does not affect the performance of the material in any way. Oil contributes to an asphalt surface's incredible elastic property. However, using fossil fuels affects the environment in a negative way. Burning fossil fuels damages the atmosphere. Many asphalt-surface seal-coating products also contain oil or other fossil fuels.
Asphalt driveways, roads and parking lots are prone to cracking, despite their elastic properties. There are several common reasons why asphalt surfaces crack. Asphalt can crack when it loses elasticity. Even if a proper seal-coating schedule is maintained, an asphalt surface can easily crack if excessive weight is drawn over or stored on the asphalt. Growing roots from nearby vegetation can also cause an asphalt surface to crack.
Asphalt surfaces are also prone to bending and warping. Storing heavy loads on an asphalt surface can easily cause the surface to warp, stretch and sink into the ground. Improper installation can also lead to asphalt deformation. Encroaching roots can easily cause an asphalt surface to sink or bubble up over the root. Nearby roots should be removed before an asphalt surface is installed. Several inches of gravel should be installed below an asphalt surface to create a uniform foundation.
Seal coating asphalt surfaces on a regular basis is a critical step in prolonging the life of the asphalt and preventing cracking. Seal coatings help an asphalt surface retain elasticity. An initial coat of sealant should be applied to all asphalt surfaces soon after the initial installation. Consumers should seal coat their asphalt surfaces every couple years to prevent cracking and warping. Most beginner-level handymen can apply seal coatings to asphalt surfaces. Purchase a 5-gallon bucket of asphalt sealant costs about $30 in 2011. The typical 5-gallon bucket of sealant covers about 400 square feet of asphalt surface.