Can You Pour Concrete Over Old Concrete

Fewer years of service.

Can you pour concrete over old concrete.

Oil dirt and other debris can affect how the new concrete bonds with the old. 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. The form shall extend above existing concrete surface based on the designated thickness of the new concrete. Pouring over old concrete need similar basic formworks that employed with fresh pours.

Pouring concrete over an existing concrete driveway or sidewalk. There are cases when pouring new concrete over old just isn t a viable solution. The condition of the existing slab is the primary factor that determines how long the new concrete will last. That kind of equipment can really punish a concrete floor.

Pouring concrete over old concrete instead of directly over a new gravel foundation limits your ability to maximize the slab s lifespan. When wouldn t i want to pour new concrete over old concrete. 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. So you may ask if pouring new concrete over the old one is a better option.

A well poured concrete slab with a deep sturdy foundation can last for 30 to 40 years. A well poured concrete slab with a deep sturdy foundation can last for 30 to 40 years. Install the form usually wood form around the perimeter of old concrete surface. You can if the concrete is sound solid with minor cracks pitting scaling surface damage or just plain ugly.

Pouring concrete over old concrete instead of directly over a new gravel foundation limits your ability to maximize the slab s lifespan. The same principles as above apply to pouring concrete over an existing concrete driveway or sidewalk. On the contrary if your existing concrete is stable and elevating a few inches of its height won t hinder anything in the way then you can certainly get new concrete poured over the old one.