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  1. #1
    Join Date
    Apr 2012
    Location
    Princeton NJ
    Posts
    125

    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

  2. #2
    Join Date
    Oct 2006
    Location
    So. NH
    Posts
    746
    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.

  3. #3
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,336
    Quote Originally Posted by central nj View Post
    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"

  4. #4
    Join Date
    Oct 2006
    Location
    So. NH
    Posts
    746
    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.

  5. #5
    Join Date
    Sep 2005
    Location
    Atlanta GA area
    Posts
    21,018
    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

    Quality work at a fair price with excellent customer service!

    Romans Ch's 5-6-7-8

    2 Chronicles 7:14

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