Gypsum board: Vapor-permeable or what?
I’m in the midst of finishing up a very long house rehab. I’ve invested a tremendous amount of resources in creating a very vapor permeable wall system. Now, I’m struggling with the interior wallboard aspect. Surfing the ‘net including this site, I can’t get a true understanding of its permeability. Of course, lacking accessible alternatives does it even matter? I’ve identified plenty of options, and they’re all pricey and relatively untested due to distorted market conditions. I need to decide before the month is out here, and I’ll pay through the nose again if need be (somehow) to complete a truly vapor permeable wall system. So far: Pine clapboard, furring strips, pineboard sheathing, Gutex wood fiber boards, Gutex blown-in wood fiber between the studs. I’d love to import the hemp-clay boards from Germany, and I’m short on resources now. Every time I attempt to reconcile myself with gypsum board, I get mixed messages via research. MGO makers, importers, and brokers all seem shady and provide no references locally for me to review in NY. Mmm.
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