Just wanted to provide a quick update. The coop has been on pavers since August, and I’m using sand as the material on the run floor over the pavers and inside the house minus the nesting box (straw). The girls free range all day outside in our suburban fenced backyard (meaning on rainy days like this they mostly hang out under the people house overhang, but hey) so the tiny coop is fine. Sand has been AMAZING and even with the wet days, no big bad smells. I just use a flat bottomed kitty litter scoop and clean out the poop from the sand in the coop daily or every few days. I haven’t needed to clean it out from the run sand. For whatever reason they rarely poop there. Probably they just eat their food quickly and get outside. They do poop on the pavers some, but it seems to be less than when they were younger. Maybe they now don’t feel like they need to stay as close to the coop during the day.
I just spray the pavers off about once a week. Now I’m somewhat regretting having tried to redo the sand between the pavers by the coop, because the cracks filed with moss on the other side naturally keep everything out, but the whole patio seems to be doing fine.
I’ll try to update again in the summer when I plan to move the coop to the side so I can replace all the run sand. Then I can see if there’s been any damage to the pavers.