Can You Pour Concrete Over Old Concrete

A well poured concrete slab with a deep sturdy foundation can last for 30 to 40 years. There are cases when pouring new concrete over old just isn t a viable solution. You can if the concrete is sound solid with minor cracks pitting scaling surface damage or just plain ugly.

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The form shall extend above existing concrete surface based on the designated thickness of the new concrete.

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. Make sure that the height of the formwork is even. Before pouring concrete over existing concrete driveway or sidewalk surfaces remove stains and loose material so the new concrete can stick properly. Pouring concrete over old concrete instead of directly over a new gravel foundation limits your ability to maximize the slab s lifespan.

A well poured concrete slab with a deep sturdy foundation can last for 30 to 40 years. 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. So you may ask if pouring new concrete over the old one is a better option. Pouring over old concrete need similar basic formworks that employed with fresh pours.

Pouring concrete over an existing concrete driveway or sidewalk. When wouldn t i want to pour new concrete over old concrete. The same principles as above apply to pouring concrete over an existing concrete driveway or sidewalk. The condition of the existing slab is the primary factor that determines how long the new concrete will last.

Oil dirt and other debris can affect how the new concrete bonds with the old. That kind of equipment can really punish a concrete floor. 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. Install the form usually wood form around the perimeter of old concrete surface.

But make sure to leave this to professionals since you don t directly pour the layer of concrete. Fewer years of service. 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.

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