Hey, everyone. There has been some good comments so I just stayed out of it since my greenhouses are used differently. Also, I have posted the construction of my flooring several times over the last few years and did not want to repeat that. But since y'all asked and just to refresh, my subflooring is simply cypress mulch, but it is the "clean", premium grade, sold in bags at Lowe's. That subflooring will be 3-4" thick, but in the walk area between the benches, it will be up to 6" thick. Over that subfloor is fabric greenhouse flooring sold by several greenhouse supply companies. I used black fabric to help with heating in the fall and winter. One fabric-floor is now five years old and the other is 3.5 years old and both have held up well. I went with this type of sub-floor/floor for two reasons. I wanted the floor to drain well yet hold moisture, so that humidity would be increased, and I wanted something soft to stand on. I am not using any stone, gravel, or pavers whatsoever. I refresh that cypress mulch every other year.
