double stud wall refit
We are renovating a small rectangular home in climate zone 7
We have removed the entire inside of the building to the four exterior 2×4 walls
There is buffalo board type sheathing under the exterior siding.
I have been reading a lot of articles including on GBA about double stud walls.
My thought is to put 2×4 ROCKWOOL batt type insulation in the existing exterior wall and then sheathe it on the inside with 1/2″ plywood, leaving the existing buffalo board and siding on the outside. I will seal all the plywood by using construction glue in addition to fasteners.
I will then build a second 2×4 wall further inside of this, leaving a 5″ gap which I will fill with spray foam. Then, I will wire the inside wall and insulate it with ROCKWOOL 2×4 batts as well and then finish it with 1/2″ drywall.
I am seeing this as a wall with high R value that has little thermal bridging and can dry to both sides of the foam
I’d appreciate any advice available. Thanks.
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