Can New Concrete Be Poured Over Old Concrete

The new concrete you pour binds to the mesh.

Can new concrete be poured over old concrete.

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. However this approach is not suitable option unless the existing concrete is in good shape structurally. Pouring concrete over old concrete instead of directly over a new gravel foundation limits your ability to maximize the slab s lifespan. New concrete is commonly poured over old concrete which may have been damaged for any reason for repairing purpose.

Press it down so it is flat and level before you add the new concrete. There s some things you have to take into consideration before you make your final decision though. 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. Smooth the surface using a two by four or float then add texture as desired using tools or a broom.

The condition of the existing slab is the primary factor that determines how long the new concrete will last. You can purchase a roll of welded wire mesh at a home improvement store then simply spread it out in a single layer over the old concrete. The condition of the existing slab is the primary factor that determines how long the new concrete will last. When pouring new mix over old concrete make the mixture stiffer than usual by adding less water.

If done properly new concrete can often be poured right over an existing slab. Spread the new concrete over the surface filling the entire area within the form you created. If the foundation beneath the slab is not sound the new concrete could sink or develop deep potholes. The honest truth about this concrete patio make over.

Pouring concrete over old concrete instead of directly over a new gravel foundation limits your ability to maximize the slab s lifespan. Although it makes the concrete stronger it won t prevent it from cracking. 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. Yes if done correctly you can pour new concrete right over existing concrete.

When wouldn t i want to pour new concrete over old concrete. Concrete surface suffers from wearing and damages over time disregard of its strength. Steel rebar is also a good idea if the slab is thick enough to allow it. So you may ask if pouring new concrete over the old one is a better option.

There are cases when pouring new concrete over old just isn t a viable solution. For this to be feasible the contractor needs to pour at least 2 inches thick use smaller aggregate and incorporate reinforcement such as welded wire mesh or fiber mixed into the concrete.