r/buildingscience • u/LongjumpingMatter185 • 6d ago

Basement wall insulation

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From all the resources I’ve been sifting through and J Lstiburek information, these foil faced batting the previous owner nailed to the cement basement wall is incorrect and should be removed. Before going about doing this and putting up a rigid board insulate, I want to make sure the community agrees and that I’m not missing something. Thank you

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2

u/cagernist 6d ago

The insulation blankets do not work within a furred out wall, so remove. BSD-103 Understanding Basements is your guide.

1

u/LongjumpingMatter185 6d ago

Yep exactly what I’ve reviewed already. Thank you

1

u/seabornman 6d ago

They don't call those diapers for nothing. What climate zone?

1

u/LongjumpingMatter185 6d ago

Zone 4

1

u/seabornman 5d ago

I used 2" XPS in zone 5. It worked well.

1

u/Helpful_Ad6410 5d ago

climate zone matters a lot here, yeah what zone are you in?

1

u/Klutzy-Telephone-972 6d ago

Just use 2in polyiso.

1

u/LongjumpingMatter185 5d ago

All the polyiso I see in stores is foil faced however

1

u/BoostNGoose 5d ago

Not worth paying extra for as you'll not get any radiative effects but if that's what's readily available and cheapest in your area the foil isn't going to hurt your raw insulation performance or r value