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How much humidity in a basement is bad?


Posted 2:37 am, 06/12/2017

about 40% i think generally


Posted 8:56 pm, 12/22/2011

Mold spores readily propagate with humidity levels of around 70 percent. At these levels mold can colonize within 24 hours. A 50 percent humidity level should be enough to do the job. Even a waterproof basement does'nt mean that it is damp proof. If your basement was ever damp enough after final construction to need to be waterproofed there are probably other issues at work. At this point the most cost effective solution is to install a good quality dehumidifier. If a 50 percent humidity level still generates mold growth its probably because the air is not being circulated very well. Allowing the air to become stagnant in the corners and areas farthest from the dehumidifier. When buying your dehumidifier pay attention to how many CFMs the unit will produce and how many pints of water a day it will capture. Oh, if you can find a unit with a built in condensate pump it will allow you to dispose of the captured water more easily than a gravity drain system.


Posted 8:15 pm, 12/22/2011

I"ve got a finished basment with heat pump ducted in with a humidifier system built into it. I think your suposed to turn it up one season and down another but I can't remember. Does anyone know?


Posted 7:33 pm, 12/22/2011

Our basement is waterproof also, but I still have a dehumidifier that pulls out about a gallon every week or so.. Best investment we ever made.


Posted 7:29 pm, 12/22/2011

Positive Drainage Keeps a House Dry



Posted 7:23 pm, 12/22/2011

Go for 35%. Much more and you'll start having the mold issues.

Home Improvement

Posted 7:18 pm, 12/22/2011

had my basement waterproofed and still have some mold.. i have a new pool table so it needs to be drier downstairs..


Posted 5:21 pm, 12/22/2011

50% or less, lower is better imo


Posted 5:18 pm, 12/22/2011

I use a de-humidifer to keep the levels between 30-35% in my house

Home Improvement

Posted 4:35 pm, 12/22/2011

How much is bad in a house?

Home Improvement

Posted 4:35 pm, 12/22/2011

How much humidity is bad in a basement. if you have a meter that detects humidity how can you tell which is a healthy or a level that will prevent mold?

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