External paddocks can be on cement but very often are on ground or gravelly soil.
A basement on ground or gravelly soil mights be difficult to be kept clean, it is uncomfortable and unsafe for the horse. Using Ecohorse tiles of big dimensions all these problems are solved and the horse can stay in a safe and clean space, not slippery.
The high stability, the total weight, the dimensions of tiles allow their use even where it is not possble or economical making a cement floor. Tiles are easy to be laiddown on any type of ground, both for inside and outside.
Even if continuously wet the conistence of tiles does not change.