Polished Concrete Floors on Existing Slab [2021]

Table of Contents

Polishing existing concrete slab vs pouring new polished concrete slab | Concrete topping on existing slab | Can you pour concrete over existing concrete? | Benefits of polishing existing concrete slab

Polished concrete floors on existing concrete slabs can create a beautiful appearance but there are some things you need to know before you do so.

  • First, the concrete floor will be as strong as the base underneath, if the base is weak or cracked, the top floor will crack in exactly the same places. So, in order to avoid this, the subfloor has to be adequately prepared to provide a stable and solid foundation for the polished concrete floor.
  • Measurements, the level of the surface will be raised by several inches, so keep this in mind as doors will have to be measured to fit when the floors are raised.
  • Maintenance, usually polished concrete floors are durable and low maintenance but placing them on top of the existing slab might make it prone to cracks and damage. Therefore, servicing and inspecting should be done regularly (preferably annually) to fix imperfections and ensure durability.

Polishing Existing Concrete Slab vs Pouring New Polished Concrete Slab

Polished concrete floors are alternative to other flooring options like tiles because they’re long-lasting and easy to maintain. Polishing an existing slab once floor coverings are removed is a less risky option compared to pouring a new polished slab because the process as simple as the existing slab is just ground and polished. The outcome, however, will depend on the quality of the slab, though it is possible to achieve a natural concrete look.

Pouring new concrete on the other hand is a process that needs to be done with care and precision in order for the old concrete to support the weight of the new concrete on top. Also, the floor surface is not as strong and might be prone to cracking, shorter lifespan and water damage.

Concrete Topping on Existing Slab

polished concrete floor

Concrete topping is whereby a layer of concrete (high strength) is placed on an old, worn-out surface so as to provide a dense, abrasion-resistant surface to increase the strength and structural depth of base concrete.

There are several procedures involved, first, the concrete base should be inspected to determine that it is hard, strong and free of cracks. The second procedure is the preparation of a concrete base; the surface should be clean, uniform and free of contamination. The third stage is whereby placement of concrete topping and steel reinforcement bars are done based on thickness and requirements of topping slab. Fourth is the finishing stage and then the lastly the curing stage which must be done for at least 7 days. There are two types of topping concrete; fully bonded and partially bonded or unbonded topping

Can you Pour Concrete over Existing Concrete?

Yes, you can pour concrete over existing concrete but it must meet certain criteria. The old concrete must be structurally sound in order to support the new concrete. Preparation of the concrete slab surface should be done, cracks should be fixed, and proper reinforcements added.

Benefits of Polishing Existing Concrete Slab

Advantages of polishing existing concrete:

  • Easy to maintain.
  • Slip and stain-resistant surface.
  • Beautiful floor finish.
  • Elimination of dust from efflorescence.

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