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Message: <blockquote data-quote="Tom_Willis" data-source="post: 769522" data-attributes="member: 236"><p>Drywall and every other thing used in construction is supposed to be either tested or graded to some national standard. Lumber and wood products like plywood are graded and the mill is identified on each piece. Testing organizations like IAPMO; (mechanical and plumbing stuff), and UL; (everything related to electricity) established standards a century ago. Then there are region-specific codes, like seismic regulations in California and frost regulations in Vermont. The South East has their own standards that should take into account conditions like the humidity and even local insects. At least that is what they are supposed to do.</p></blockquote><p></p>