Can You Pour Concrete Over Existing Concrete
Camila Farah
Is the existing concrete sound.
You can easily pour over the existing concrete but please don t use fibermesh concrete. It can be painted on or applied with a rag. Concrete over concrete by. The form shall extend above existing concrete surface based on the designated thickness of the new concrete.
The key to successfully pouring concrete over an existing concrete surface is to ensure the two layers bond properly. Apply the new concrete over the primer. Pour concrete onto the existing slab until it is around where you want the final level to be. Pouring concrete over old concrete instead of directly over a new gravel foundation limits your ability to maximize the slab s lifespan.
Even though concrete is strong and forms a hard structure there s nothing in it that helps it stick to old concrete. Add all of the concrete right away so none of the mixture has a chance to dry out. You could drill holes into the existing concrete surface and insert steel pins and then the mesh on top. When i say bond the concrete you are lying on top off needs to be a rough finish like scabbled.
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However proper prep work is needed. Yes if done correctly you can pour new concrete right over existing concrete. Pouring concrete over the existing one. There s some things you have to take into consideration before you make your final decision though.
You will need a binding agent to make the new pour stick. Install the form usually wood form around the perimeter of old concrete surface. Disadvantages of pouring new concrete over existing concrete. Pouring over old concrete need similar basic formworks that employed with fresh pours.
Engineer if you are laying pouring concrete over existing concrete there needs to be a bond. The condition of the existing slab is the primary factor that determines how long the new concrete will last. I ve had the misfortune of having to remove far too much of it over the years as it cracks and flakes. Pouring a new layer of concrete over an existing walkway patio or porch will raise the level by several inches.
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