Most concrete can be used after tearing out the older floor and cleaning it. Obviously concrete that has had other flooring will not look the same as new concrete, but it gains character flaws and history. Some flooring will leave a “shadow” of where it has been. We will be happy to show you photos and send you to other stores so that you can see what might happen. We normally do 5 remodels a month on homes that have had other flooring previously, so we have experience in getting the best possible results from these floors.