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You can dry pour concrete over existing concrete, but it’s best to use wet pour concrete instead. Dry pour concrete is easier to apply, but in order for new concrete to adhere to old concrete, it needs the right mixture for slow, uniform curing. Additionally, dry pour concrete is less durable and less resistant to cracking and concrete sinking, so dry pouring over an existing slab may result in surface imperfections appearing prematurely.

Visible cracks, scaling, flaking, and uneven surfaces indicate a bad concrete job. Additional signs vary depending on the project. You may notice poor drainage or even exposed rebar. Quality issues result from using the wrong concrete, rushing the work, or inexperienced workers completing the job.

If your cement garage floor is sinking and cracking, your first step should be to call a local structural engineer to assess the problem. They can determine if it’s a minor amount of sinking related to normal settlement or if the issue is structural in nature. If you do have structural damage, the engineer or a foundation repair company that you hire will come up with a plan to fix the issue, which often consists of mudjacking for less severe issues or underpinning for more extensive problems.

Concrete spalling can be fairly serious, especially if left untreated or in a public area. It can be a tripping hazard and, if not resolved, can lead to structural instability.