When building a green house, it is important for it to be cool in the summer and warm in the winter. Of course, to do this, energy is required, but to make if energy efficient, a dirt floor might be better, as this would allow for heat production from the earth. However, dirt is not a good insulator, but cement is, so concerves the heat better. What do each do to cold?
If it's a big commercial thing I guess cement, which i'd never have.
You need cement to create a barrier between you and cancer causing Radon gas in your home. Your home would be impossible to re-sell without this.
Concrete is best due to the amount of water used in a green house. You may put in a drain and pitch the floor toward it. Also cleaning is much simpler.
if you got money you could use geothermal heating where they bury the pipes deep under ground and use natural heat from the earth. definitely cement floors with a 1 foot footing around the perimeter to keep rodents from digging and sheltering under the slab. then install a draining system and pitch the concrete for easy clean up. the concrete also provides a more stable foundation for the walls if anchored correctly. just depends on how much you want to spend.
