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Yes, you can pour new concrete over old concrete, but you need to apply a concrete bonding agent to the existing concrete to ensure the new concrete sticks. Keep in mind that even with a bonding agent, large cracks and other flaws will still come through. If the concrete has heaved, settled, or cracked, pouring new concrete on top won’t address any root structural problems. Removing the existing concrete and rebuilding will be your best solution in that case.

If your concrete stains are green in color, it indicates the presence of mold or algae—which you should address right away. If left unattended, mold will spread to other areas throughout the home. However, be careful not to disturb mold on indoor concrete surfaces and work with a local mold remediation specialist for specialized care. Once free from mold and algae, seal your concrete to eliminate pores and gaps.

Yes—as long as the area has been properly prepped. Different self-leveling brands and compounds have their own specific instructions for preparation; some may require that you add primer or grind the surface. Without proper preparation of the surface, the compound will not be able to fully bond to the concrete and fill the cure as a separate layer, which makes it prone to chipping.

Concrete lasts much longer than cement, as it can withstand heavy loads and harsh weather conditions. Concrete can last for over 100 years under most conditions. Cement cracks and crumbles when used independently, but it is an important ingredient of building materials such as concrete and mortar. You use cement and other ingredients to make concrete.