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This flooring does not require any materials to be constructed, but it needs to be placed on rough stone and takes a greater amount of time to be completed than any artificial flooring placed on top. Note that smooth floor takes less time than smooth wall counterpart, whereas the later takes 6,500 ticks ( .
It is recommended to be used as standard flooring whenever available, as it more easily provides the pleasant environment bonus to your colonists, not to mention it's free. Perfect flooring for a "Dwarfy" colony, built into the side of a mountain.
Since rough stone floors are widely available in most biomes, an easy way to train colonists in Construction is to select large sections of rough stone and set them for smoothing.