Re: Fieldstone basement w/ poly vapor barrier - how to insulate
You have a tricky situation there.
Whenever thinking about finishing a basement I recommend to ensure there aren't any issues with moisture and check the relative humidity ( RH ). Seems as tough you have addressed water control in the basement but , you need to ensure the RH doesn't get any higher than 40 - 50 % ---- the lower the better in reducing mold and milde issues.
The insulaing will be difficult in part because of the vapour barrier on the cold surface also, because of the irregular surface of the wall.
This might be a good candiate for spray foam insulation to be used here.
It's possible in your particular region 1/2 pound open cell will be acceptable since it may allow any drying required to be be done to the interior.
The 2 lb. closed cell foam may also be a good candiate.
I've know of one foundation simialr to your's --- though the covering was a dimpled product --- and spray foam was used over the entire wall surface --- then the wall framing was placed in front and covered with moisture resistant drywall.
You will definately need to check with your municipal building office as to their requirement and recommendation.
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