I’m a bean counter so please forgive me if I dont get terminology correct. I have a question about my total wall assembly.
Zone 4 outside Philadelphia. Wall assembly from inside out.
Option A: dry wall, 2×2 furring strip, 2″ inches of roxul, vapor barrier, 2×4 framing w/ roxul, osb, tyvek, 2″ roxul, rain screen, verticle furring strip, vinyl siding
Option B: dry wall, 2×2 furring strip, 2″ inches of roxul, vapor barrier, 2×4 framing w/ roxul, zip system R-sheating insulate, seams taped, vinyl siding
Couple of things:
I don’t want to go back and plan on 2×6. Im hoping the 2×4 with 2×2 furring strips will allow me a comparitive rvalue as a 2×6.
I would prefer to have the moisture dry outward but I want to make sure that osb doesn’t warp to make a 48′ long wall siding look warped.
1. Is my wall assembly sound? Whats better option A or B?
2. Would i be able to achieve a better RValue (approx 25.5 – 18.5 inside and 7 outside) for similar dollars?
3. Is the Total cost (material + quality contractor costs) for option a or option b cheaper?
I know that there quite a few passionate folks here and I’m looking for honest advice. Also I’m trying to balance eco consciousness with monthly payments.
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