Double-wall construction

wwsteel7

So, I am planning on building a 1000 sq ft super-insulated cabin, (located in mid-Saskatchewan where it can be very cold), and intend to make the exterior wall a double-wall.

I would like to make the outer wall with 2x8 for R-35 batt insulation which is 8 inches thick, and the inner wall with 2x6 and R-20 batt insulation, and a 2-3 inch air space in between.

Does anyone have any experience building double-wall construction for housing? Where exactly should the vapour barrier be located?

Any help on building a super-insulated home would be greatly appreciated.

Gary in WA

I moved you to "Insulation" for better response, if you don't mind.

This will get you started, notice the gaps for convective loops; The "biggest loser" in fiberglass insulation....

Gary

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