My basement is humid from spring to fall (I'm in Eastern Mass). There is no water to be seen, no obvious cracks or moist walls but all the boxes and books stored in the basement are growing mold. The basement smells musty and the humidity sensor hits 78% in the summer and only drops below 50% in winter.
It's a recent construction (2002) and the builder claims to have put in a high quality vapor barrier so he's perplexed about the problem. We have our water heater (which heats water for our baseboard heating system) and a 2nd fridge in the basement. A rep from the water heater company has looked at the heater installation and didn't see any problems.
This is a two unit condo and the other unit shares the same foundation (separated by a fire wall) and their basement has no humidity problems! (They are on the lower ground and the sump pump is on their side...)
We're stumped and stuck. If I can't find the source and eliminate it, I'll put in a dehumidifier but even then I'd be knowing the source of the problem, even if it can't be fixed.
Any suggestions on where to start?
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