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How would you seal this gap under central boiler hydronic baseboard heaters that only get warm, not hot.
(sh.itjust.works)
this post was submitted on 19 Oct 2023
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You're absolutely begging for moisture problems if you put spray foam in there. It should be open exactly like it is, albeit cut closer to the wall. That really won't stop bugs anyway, you're much better off treating the perimeter and plugging exterior access holes.
Ugh not even worth it. OP do whatever the hell you want.