Light-gauge metal framing

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Author Message Paul Sweet (Unregistered Guest) Unregistered guest Posted on Wednesday, March 09, 2016 - 08:41 am:    I was just told that Gypsum Association GA-216 now requires impact-resistant gypsum board to have 33 mil (20 ga. for dinosaurs like me) structural (not drywall) studs, which would be a substantial cost increase. What is the difference between structural studs and drywall studs? I always thought it was just the thickness and where they were used. Guest (Unregistered Guest) Unregistered guest Posted on Wednesday, March 09, 2016 - 11:54 am:    Looking through GA-216-13 (available to view for free here from the Gypsum Association: https://www.gypsum.org/publications/view-only/application-finishing-gypsum-panel-products-ga-216-13/), I didn't see anything that would indicate impact-resistant board be applied to any particular thickness of stud. They do note however that steel framing members from 0.033 inch to 0.112 inch shall comply with ASTM C 955 which is for load bearing studs. But that would apply anyway, regardless of what type of board is being fastened to it. Is there a more recent update than from 2013? David G. Axt, CCS, CSI ,SCIP Senior Member Username: david_axt Post Number: 1467 Registered: 03-2002 Posted on Wednesday, March 09, 2016 - 02:39 pm:    Guest, Yes there is a new GA-216-2016 publication. https://www.gypsum.org/2016/01/gypsum-association-releases-revised-application-standard-ga-216-2016/ I have not seen this publication. David G. Axt, CCS, CSI, SCIP Specifications Consultant Axt Consulting LLC John Bunzick, CCS, CCCA, LEED AP Senior Member Username: bunzick Post Number: 1670 Registered: 03-2002 Posted on Wednesday, March 09, 2016 - 04:04 pm:    This may be to do with screw holding capabilities. This has been a requirement (or at least a recommendation) for cement board substrates for some time. It does cost more of course, but depending on the situation maybe not. For example, with some projects I did the stud heights were such that we already were at a higher metal thickness to reach deflection limits.