Good question. Bring the foam down below the sil an foam/tape it. There's no way these tapes and spray foams will last 100 years so I usually try to find more robust methods. Unfortunately we're dealing with foam here so tape is probably what to use. One of the reasons people use foil faced foam is that you can tale it with foil tape and it lasts a long time.
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Chipping away on a daily basis.
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You know you're an ecorenovator if anything worth insulating is worth superinsulating.
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S-F: "What happens when you slam the door on a really tight house? Do the basement windows blow out?"
Green Building Guru: "You can't slam the door on a really tight house. You have to work to pull it shut."
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