Can You Pour Concrete Over Old Concrete

Pouring concrete over old concrete instead of directly over a new gravel foundation limits your ability to maximize the slab s lifespan.

Can you pour concrete over old concrete.

The form shall extend above existing concrete surface based on the designated thickness of the new concrete. That kind of equipment can really punish a concrete floor. But make sure to leave this to professionals since you don t directly pour the layer of concrete. A well poured concrete slab with a deep sturdy foundation can last for 30 to 40 years.

We d say no since concrete doesn t have any bonding agents of its own to grip onto the new layer but it s a yes if you get a layer in between the two and help the top layer adhere to the surface beneath. Pouring over old concrete need similar basic formworks that employed with fresh pours. Pouring concrete over old concrete instead of directly over a new gravel foundation limits your ability to maximize the slab s lifespan. The condition of the existing slab is the primary factor that determines how long the new concrete will last.

Make sure that the height of the formwork is even. A well poured concrete slab with a deep sturdy foundation can last for 30 to 40 years. You can if the concrete is sound solid with minor cracks pitting scaling surface damage or just plain ugly. If you re concrete has large cracks and the slab may still be moving due to freeze and thaw conditions or settling then a tear out and replace is a better solution.

Pouring concrete over an existing concrete driveway or sidewalk. The same principles as above apply to pouring concrete over an existing concrete driveway or sidewalk. Install the form usually wood form around the perimeter of old concrete surface. When wouldn t i want to pour new concrete over old concrete.

There are cases when pouring new concrete over old just isn t a viable solution. Oil dirt and other debris can affect how the new concrete bonds with the old. Fewer years of service.