If I spray-foam my basement walls, do I need to add mechanical ventilation?
I have a 2 story house plus full basement in Maine (climate zone 6). Foundation walls are uninsulated concrete; floor is concrete. House was originally built around 1955; 2nd story addition was put on around 2005.
In the summer we have A LOT of humidity in the basement. To help alleviate this – and also to better insulate the house – I’m considering spray-foaming (w/ two-part spray-foam) the basement walls.
My question is – if the basement walls all become air-sealed – will it become necessary for me to also install mechanical ventilation to maintain/improve air quality in basement?
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