Insulating shower exterior wall
Home Improvement Asked by Jake Schmitz on February 7, 2021
Redoing a bathroom where one of the shower walls is an exterior wall. Framing is done with 2×6 and I would like to replace the current insulation pictured with XPS foam board. Due to my location, the best I can get my hands on is 2” thick with an R10 value.
My plan is to double up since I have room and worth it in my opinion. Main question is should I put in a vapor barrier? House was built in 1984 and no vapor barrier anywhere else. 
One Answer
XPS does not need vapour barrier. I tape mine to the studs using technical tape (red vapour barrier tape). Fill gaps with expanding foam.
If you are getting this inspected, check first: climate and jurisdiction matters. As with vapour control and inspections: "opinions vary on the facts" if you get my drift.
Answered by P2000 on February 7, 2021
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