Basement wall insulation
I’m planning to finish my basement, starting in a couple of weeks. I’ve been spending the last 6 months, at least, trying to figuring out what’s the best way to do it. I read everything possible but the more I read the more confused I get. And that’s why I decided to ask here.
my House was built in the 1940s. Basement walls are dry. Actually the basement in general looks very dry. Temperature without heating is always constant (64/66 degrees in winter time and 68/70 in summer). In summer time I need to run the dehumidifier other ways humidity will be around 75%. The previous owner painted some walls with an oil paint, I started scraping parts that became loose. Beyond the paint there was no moisture.
in some spots (the one not painted) there’s some efflorescence that I’m vacuuming once every 5/6 month.
I want to start with the best insulation for the wall and then I’m gonna concentrate on the rest.
I’m planning to use rigid foam for the walls and then metal studs and gypsum board at the end (leaving the cavity empty)
Do I need to paint the walls before using rigid foam? If yes, which paint?
Wich rigid foam insulation is the best way to go (this is where I’m really scared to make a mistake)? EPS or XPS?
I know that EPS will be vapor permeance while XPS will completale seal the wall.
for me would make more sense to let the wall to transpire but maybe I’m wrong.
Please help me make the right choice.
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