I am in the process of building a greenhouse adjacent to my house and was having second thoughts on a slab for called for in the design. I am thinking instead rock / tile over gravel would suffice. However I don't know if this will create moisture issues. I do prefer an organic look. There is insulated footers/stem wall on the periphery. The one advantage that slab may have is its thermal mass on a south facing aspect.
Kurt
Kurt
