Room above garage
One more question on my room above garage. The home is in zone 5 and the garage is 24’x24′ The floor system has 16″ deep tji 16′ on centers. I will be filing between the joists with mineral wool and then Solitex Mento for air tightness with 2 1/2 ” of 8lb Roxul IS Board as a thermal break then covered with 5/8″ drywall. I plan on using strapping 24′ oc however where should it be placed. Should I place 2×4 strapping 24″ oc with mineral wool board in between and then a layer of mineral wool board with 5/8 drywall or the revers with a layer of mineral wool board first and then 2×4 strapping and mineral wool board and 5/8 drywall. I’ve looked at the diagram for adding mineral wool to the exterior house wall and applied it to garage ceiling. I’m concerned with the extra weight and bulk and the best screws to use for the 2×4 strapping and drywall.
Any suggestions will be appreciated
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