this post was submitted on 04 Apr 2026
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2x4s are fine for up to 2 story houses where I live, so you either use 2x6 to get the r20, or a slightly better option. Still use 2x4, but clad it in rigid insulation to go from r12 to r20. This removes issues like thermal bridging and moisture penetration. But costs more and takes longer to do as well.