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Can you tell me if they make drywall and a mud that could be installed on a porch ceiling I live in Texas (hot and humid) and I worry about sagging and mold. I am not sure if green board would hold up to this.
Are you talking about GYP shething? I have used it a lot in fire walls but have never taped it. Every exterior instlation with rock I have seen has failed. Try cement board and veneer plaster or stuco.
I have used a product called soffit board (a stiffer board, felt just like regular drywall to me) that can be screwed to 24 oc framing and it has held up in Toronto for two winters now. On a coivered porch, taped and painted just as if it was interior.