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basement room 58% humidity
Hi,
I have a finished/conditioned basement, drywall on sides (?insulated also). There is a small, silly, maybe 150 sq ft door-ed off unfinished room. This tiny room isn't conditioned. The house is 70 F, 35% humidity; the tiny room is high 50's, but also high 50's humidity.
I read that ideal humidity should be <50 to prevent mold/etc. Should I be worried about this little room? It's not like i see any mold on the concrete or rafters. Should I add a small supply to it or do something just in case?
Steve
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You most likely have nothing to worry about.
Relative humidity [RH] is relative to temperature. Hot air can hold more moisture than cold air, so the same amount of air and water will have lower RH at 70F than at 55F.
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 Originally Posted by central nj
Hi,
I have a finished/conditioned basement, drywall on sides (?insulated also). There is a small, silly, maybe 150 sq ft door-ed off unfinished room. This tiny room isn't conditioned. The house is 70 F, 35% humidity; the tiny room is high 50's, but also high 50's humidity.
I read that ideal humidity should be <50 to prevent mold/etc. Should I be worried about this little room? It's not like i see any mold on the concrete or rafters. Should I add a small supply to it or do something just in case?
Steve
Occasional 60%RH is ok usally. You will need dehumidification when the outdoor dew points go +60^F and the a/c is not operating much. Continue to monitor the all of the lower levels of the home as the outdoor dew points rise this spring. When you exceed 65%RH in any space, operate a good dehumidifier. Free standing units like the Santa Fe or Ultra-Aire are high efficiency and durable.
Keep us posted as the outdoor dew points rise. You will be amazed on how the basement %RH tracks with outdoor dew points.
Regards TB
Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
Use +Merv 10 air filter. -Don't forget the "Golden Rule"
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Just another thought, you could probably just leave that door opened a little to equalize things a bit. Still don't see it as a winter problem but like TB said keep an eye on it this summer.
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Circulation of air would help... might look at a small vent in the room and either keep the door not quite closed or cut a small vent into the door. Result will be a small amount of air moving through the room... thus mixing drier air with damper air.
Yes, there is more science to it than this... however air circulation always helps.
GA-HVAC-Tech
Your comfort, Your way, Everyday!
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