I plan to finish a small 10 X 13 ft room in my basement. Because space is at
a premium I plan to flat frame 2 X 4's with 2 X 2 top and bottom plates, use
XPS insulation and cover with 1/2" drywall. 2 of the walls are against a
poured concrete foundation. My questions are:
1) I have done a google search and read many books and am confused as to
which side (if either) should be covered with plastic sheathing. Some
recommend covering the foundation walls; some suggest that the plastic should
be sandwiched between the insulation and the drywall; some suggest to do both
and, an increasing number of people, suggest doing neither. I live in a cold
climate (midwest). Is there anything new or definitive on this subject? Any
2) any drawbacks (or advantages) to painting the foundation walls with
waterproof paint (I understand that Drylock only lasts about 5 years)?
3) should I put firestops between the studs or is the top plate (2X2)
sufficient for this purpose?