Garage conversion: air sealing between foundation and siding?
Hi. We have a studio that was a converted from a garage. Quite a few spiders are finding their way in (*far* more than the main house) and it has more cold drafts in the winter.
I know I can do more sealing in the inside space, but I’d like to address the problem as close to the origin as possible. Since it’s on a slab, the only way I can see spiders getting so much access is between the foundation and the siding.
Attached are some photos. Can you help me understand what I’m seeing here? We have the foundation, then particle board, a vapor barrier of some kind, another board, and then the siding? (siding is fiber cement).
What is acceptable to do here? Does it need air flow? If so, can I use an open cell foam or somesuch that will block the penetrations but still allow it to breathe? Would that also potentially help with the drafts, or we’d need close-cell or caulk for that?
We’re in zone 4C.
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