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What is the best base for rubber tiles?

A good sub-base is necessary in order to yield the best results when installing rubber tiles. Of all the potential surfaces for installing rubber, a flat concrete surface is probably the most ideal. Another surface that is good for rubber flooring is ceramic tile, but because of the fragile nature of these materials, it may be necessary to include some sort of protection and subflooring. Using rubber tiles over ''natural'' outdoor surfaces such as grass, rock, and dirt is not recommended.