Is a double stud wall with wood and steel studs a good idea?
I am an architect from Toronto. I designed a one storey addition to an existing brick house. I am putting 3″ of rigid insulation on the outside of the new building envelope and a double stud wall using 2″x4″ wood stud for the outter stud and 2-1/2″metal studs on the inside as a chase space and using plywood between the 2 stud walls as vapour barrier thus eliminating 6 mil vapour barrier. I am insulating all stud cavities with roxul.
Do you see a problem in this assembly? Why is this assembly never done?
Thanks for your review and expert opinion in advance.
BArch, OAA, LEED AP
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