in scale that is a crawl space. Your typical raised chicken coop is like a house on stilts given the scaleI just surrounded the base of the coop with hardware cloth. My coop that is too low for reasons I don't have time to go into, is damper than those with circulation underneath. This is why houses have crawl spaces.
I gave my results and what works for me on 4 of 9 coops and they all would be low if I had it to do over.Your results may vary