Service cavity in retrofit without losing floor space
I am working on an interior renovation and the details of our walls can be found in my other post
Controlling Vapor Drive Inside Soon-to-be-Renovated Walls – GreenBuildingAdvisor
I am seriously considering adding a service cavity which would significantly reduce the risk of air infiltration. It would also allow us to move plumbing and ductwork inboard which has some huge advantages as well.
However, this question is about a specific detail that I haven’t seed discussed. In a couple of locations we just can’t afford to lose the floor space so I wanted to see if anyone had feedback on the idea of converting a 2×6 wall to a pair of 2×4 walls with the vapor barrier/retarder in between?
Essentially this process:
Remove the 2×6
Install a 2×4
Insulate the bay
Install a vapor control membrane
Install a 2x true-2″ -or-
Install a 2×2 bottom and top plate and a second 2×4
Run services in interior cavity
Insulate this cavity
Install wall board
As long as the inside cavity is never in condensation in the winter and the outside cavity is never in condensation in the summer would this work?
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