What is the best way to insulate the basement of an old house?

Bryan Squirrell
Updated: Sept. 4, 2020

I read your article about insulating interior basement walls, using eps or Rockwool comfort board then 2 x 4 studs with rockwool bats.  I've also seen the part about possible breaking floor for a complete reno.  I'm just wondering if the poly is against the concrete or between the 2" layer of EPS and stud wall,  as well as if poly extends to bottom of first floor or stop at top of concrete?  Plus, if I don't have time can I add to ( tape) floor section later.  I would like to insulate the walls first then decide later to do the whole floor?  If I don't want to do the whole thing (floor)  is the poly necessary on the wall?  I wanted to find out what is required,  I like the idea of Rockwool all the way,  but if it is better to go with EPS then bats.   Thanks for your help!



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