Can You Asphalt Over Concrete

It doesn t have near the strength of concrete when you measure them inch for inch.

Can you asphalt over concrete.

Concrete provides an excellent base for the asphalt which must have a well compacted stable foundation to yield superior results. It just doesn t make fiscal sense to do it as that driveway will need a lot more work in the near future. Unstable concrete base concrete is not a compacted surface because of how hard it is when dry. It will however require a little more maintenance than a typical asphalt overlay.

Asphalt paving contractors frequently use asphalt over concrete on interstates state highways and city streets. Asphalt works as a driveway base under concrete only when it is strong stable and at least 2 to 3 inches thick. When concrete deteriorates it draws and holds moisture. Putting asphalt over concrete is done for several reasons but does have its drawbacks.

Asphalt driveways that are paved over an appropriately compacted subbase will always be superior to asphalt that is laid over an unstable base or concrete that is prone to shifting and expansion. So pouring asphalt over concrete will result in cracks in the asphalt anywhere that the concrete moves beneath it. Concrete is a great base material because it is stable and allows for excellent compaction of the asphalt above. While it is safe to pave asphalt over concrete there are several reasons why we do not recommend this method.

One positive aspect of installing blacktop over concrete is the concrete provides a firm base for the flexible asphalt paving. Adversely asphalt is a monolithic slab possessing both solid and liquid qualities and though it has movement of its own it moves differently than concrete. Asphalt is far easier to maintain than concrete. Pouring asphalt over concrete is bad for the longevity of your driveway so yes pouring asphalt over concrete may look good at first but there are bound to be troubles over time.

The answer to the extremely common question can i lay new asphalt over old concrete is yes you can but we discourage it. Holes or cracks with depth of 2 inches or more require filling before concrete overlay is applied. In fact many miles of concrete roads are paved over with asphalt every year. The truth about asphalt over concrete.

The asphalt cement that bonds the pieces of sand and gravel in the blacktop can and does move over time. It is safe to pave asphalt over concrete. Applying an asphalt overlay to a concrete surface is a common practice. Experts who work each day in the blacktop industry refer to blacktop as flexible pavement.

Asphalt requires a well prepared stable subbase otherwise the resulting pavement will be subject to instability and cracking. An asphalt overlay is cheaper to install than replacing concrete and can provide a smooth ride over deteriorating concrete. Concrete however typically needs to be replaced to restore its luster which is expensive and time consuming to do. Holes and cracks can simply be filled with new asphalt or be tarred over for greater durability.