Pouring Concrete Over Concrete

You need to start with a clean surface and ensure a proper bond to create a new concrete surface that lasts. New concrete is commonly poured over old concrete which may have been damaged for any reason for repairing purpose. When i say bond the concrete you are lying on top off needs to be a rough finish like scabbled.

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Engineer if you are laying pouring concrete over existing concrete there needs to be a bond.

Pouring concrete over concrete. There are cases when pouring new concrete over old just isn t a viable solution. Placement of new concrete over old concrete. The condition of the existing slab is the primary factor that determines how long the new concrete will last. Pouring concrete over old concrete instead of directly over a new gravel foundation limits your ability to maximize the slab s lifespan.

However this approach is not suitable option unless the existing concrete is in good shape structurally. Pouring concrete over existing concrete sidewalk or patio surfaces is an option if the existing base is structurally sound. As such you may find it prudent to add a mesh or rebar structure to your new hybrid concrete slab. Finish the work by priming the surface and pouring a mix over it giving your concrete foundation a fresh new coat.

Otherwise there s a risk for new wet concrete to seep into that gap and cause the slab to become uneven at that edge. Often the process of pouring new concrete over old concrete can cause its overall thickness to increase noticeably. Adding fresh concrete is a common way to level out old slabs and patch damage. You could drill holes into the existing concrete surface and insert steel pins and then the mesh on top.

Concrete over concrete by. If you plan on pouring a lot of concrete build a wood and mesh barrier first to ensure your new slab is strong. Here s the catch if the existing surface is somewhat in a structurally sound shape and elevating its height to a few inches won t be a problem you can certainly freshen it up with a new layer of 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.

When wouldn t i want to pour new concrete over old concrete. Pouring concrete over the existing one. Concrete surface suffers from wearing and damages over time disregard of its strength.