Advice on basement wall finishing

Hi, First time homeowner, I just ripped out old wooden paneling, plastic vapor barrier, and fiberglass insulation in the basement and am preparing for some drywall. I need advice on how to go about adding some air control- from research I’ve seen that before the framing goes up you install foam boards to the wall and then frame over that. I have existing framework I’d like to keep if possible, so I’m wondering if I should install the boards between the existing framing, seal up with tape/foam, and then add insulation (mineral wool batts) behind that? The foam boards would be mainly for moisture control because there is only 2 inches of depth to work with. I’ve also seen “smart” vapor barriers that breathe more in the summers when it’s humid and lock out moisture in the dry winters. I know this probably isn’t necessary when you have the foam boards installed properly under the framing, but in my situation should I use both? And as a side note, one of the walls is shared partially with my garage (only the upper half). I was planning on just insulating with a thicker mineral wool batt on the upper wall where it is shared + smart membrane, and then doing whatever is determined for the other wall on the bottom half. Any help would be appreciated! I’m open to any and all pointers :) submitted by /u/YeMeLeMe [link] [comments]

Apr 30, 2025 - 22:57
 0
Advice on basement wall finishing
Advice on basement wall finishing

Hi,

First time homeowner, I just ripped out old wooden paneling, plastic vapor barrier, and fiberglass insulation in the basement and am preparing for some drywall.

I need advice on how to go about adding some air control- from research I’ve seen that before the framing goes up you install foam boards to the wall and then frame over that. I have existing framework I’d like to keep if possible, so I’m wondering if I should install the boards between the existing framing, seal up with tape/foam, and then add insulation (mineral wool batts) behind that? The foam boards would be mainly for moisture control because there is only 2 inches of depth to work with.

I’ve also seen “smart” vapor barriers that breathe more in the summers when it’s humid and lock out moisture in the dry winters. I know this probably isn’t necessary when you have the foam boards installed properly under the framing, but in my situation should I use both?

And as a side note, one of the walls is shared partially with my garage (only the upper half). I was planning on just insulating with a thicker mineral wool batt on the upper wall where it is shared + smart membrane, and then doing whatever is determined for the other wall on the bottom half.

Any help would be appreciated! I’m open to any and all pointers :)

submitted by /u/YeMeLeMe
[link] [comments]