I live in gers (aka 'yurts') in the mountains of Mongolia. The climate is similar to Colorado but probably even drier. Also much colder. Our rainy season is only in the summer but not especially wet, by world standards, even then.
Generally there'll be no issues with mold as long as you stop the cover from trailing on the ground and wicking up
. Also, make sure there are no leaks in the upper area of the cover. I've no idea what materials are used in
but we tend to use natural materials in Mongolia (cotton canvas and wool felts). I think the cotton has PWR treatment but will wet-out eventually but it doesn't seem to leak through to the felt, luckily.
We tend to prefer concrete foundations. I don't know why but concrete is much cheaper here than lumber. We built a ring on a ring. The inner ring is the diameter of the ger base. Mine is 7.2m (23.6') diameter. Then 10cm (4") lower is the bigger ring, about 7.8m (25.5') diameter. The outer cover overlaps the inner ring but doesn't touch the surface of the outer ring. If it does, trim it back until there's a small gap of a centimeter (3/8") or so.
We have a concrete patio at the door of each ger which is below the level of the outer ring by about 30cm (12").
Some photos might help. A couple of angles of the frame going on foundation.
Note the canvas edge is slightly off the outer ring.
In addition we have quite a lot of operable windows (almost floor level), an opening crown on the top, and quite large doors (with side panel window). So we can vent well with natural ventilation. We might get a ceiling fan one day.
Manually operable crown. Open in the photo. We use this a lot.
Floor level windows are great for venting and cats.
We're still working on the connecting hallway/bathroom which is in the middle but the foundation is all done because concrete season is over. The hallway is done structurally but needs a lot more finish and internal work. That's in another thread and is maybe not relevant to this question. I'm updating that post as I go, if you're interested here:
https://www.yurtforum.com/forums/yur...olia-2452.html