in florida when I had to rock round walls we would stand up 3/8 drywall against a wall then in the morning after sucking up humidity all nite it would be half round bowed out in the middle and were able to put 2 layers on the round wallMichigan is one hell of a humid state during summer months and I've never had an issue with that. I have had rain make it a mess tho. It's always a better idea to screw a 2x4 frame on it. Helps integrity. Heavy yes but hauling it by pickup to the site makes it easy. I hang a steel gong in front of it but it's never an issue with humidity desinigrating it.
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