Ok, i'd like to ask advise per application.
I have to rough a post & beam, the skelton is placed, 1/2"sheet rock next(seen in interior), 1/2" aspinite next( some call it pressboard), then 1 1/2" hard insulation, the 1 1/2" insulation again before sheating/siding.

The builder would like me to only box out through the first 1 1/2" layer, as to not break into the 2nd. So that leaves me with
2 1/2" from finish surface back.

T370-16(a) says 12.5 cu, 5-12's for a device box

any ideas or suggestions ????

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[This message has been edited by sparky (edited 05-06-2001).]