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How much is too much humidity in a basement?


Staff member
My weatherdirect temperature/humidity sensor has been saying I have had 60% humidity in my basement a couple of times this week. It is an unfinished basement and it seems dry to me (the walls and floor are dry). Is this too much humidity to have in a basement?
Alex D. from TRIBE on Utility Room


TRIBE Member
Perhaps slightly high. Does it smell musty at all (I guess if it is unfinished it probably does)? Any evidence of mold?

A lot of people use the 30 per cent to 50 per cent relative humidity rule of thumb. A lot can depend of if you see any symptoms of too much or too little.

Considering your basement isn't finished it's less of a concern I would think.

If you have central A/C you may want to consider checking to see if you have both a supply and a return vent down there. Considering you basement isn't finished I doubt you have AC down there though, so this is really more of an overall tip, not necessarily for you.

If you have any electronic devices down there it is certainly too high.
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