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Yes, you can pour concrete over an existing concrete basement floor to save time and money on fully ripping out an existing concrete slab. However, it’s not a perfect solution, so consult a pro before moving forward. You must take specific measurements, and these kinds of floors don’t have the same longevity.

No, wet concrete will not bond to dry concrete without an additional bonding agent. The common alternative is adding a sand or gravel layer under a concrete slab to enhance bonding and create a stable foundation. The right choice depends on the height and thickness of your two slabs, local laws, and the use of the specific concrete slab.

Self-leveling concrete is the best option for your garage floor since it guarantees an even surface in the end. However, most garage floors weren’t made with self-leveling concrete. You don’t need to fully replace the garage floor to use self-leveling concrete. A quarter-to-half-inch of self-leveling concrete on top of your existing floor will be sufficient for a smooth and even finish.

Concrete dries faster in the heat than in the cold, but when concrete cures too fast, it can cause weak concrete. It’s best to pour concrete when temperatures are between 50 and 85 degrees Fahrenheit, watering it five to 10 times per day for seven days (unless you pour concrete in the winter). Slower cure times, such as when pouring concrete in cold weather, can cause strong concrete, but you need to monitor the temperature drop and moisture levels. Avoid pouring concrete when temperatures are below 40 degrees Fahrenheit.