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  1. 07-14-2008, 01:40 PM #1
    kkmcewen
    kkmcewen is offline Regular Guest
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    Condensation On Plenum

    Is it normal for condensation to be on the outside of plenum in the attic. It was over 100 degrees in the attic and there was slight condenation on the output side of the blower.
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  2. 07-14-2008, 10:52 PM #2
    superd77
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    You mat have air leaks. Or missing insulation on inside of air handler. Only seen a couple sweat in attics. Both were foamed attics.
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  3. 07-14-2008, 10:54 PM #3
    richmod
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    How about on the plenum in a crawl space? Our new system has slot of condensation on the plenum. Is that normal?
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  4. 07-14-2008, 10:59 PM #4
    superd77
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    Yep!!

    Do you have a good moisture barrier??

    Does rain water get under the house???

    Is the crawl damp???
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  5. 07-14-2008, 11:04 PM #5
    BALLIN J 23
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    To Humid In Attic Call Technician To Look At Duct Work
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  6. 07-14-2008, 11:14 PM #6
    richmod
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    Quote Originally Posted by superd77 View Post
    Do you have a good moisture barrier??

    Does rain water get under the house???

    Is the crawl damp???
    Yes, no, and not really.

    Maybe I'm dense, but just making sure - it is normal, correct?
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  7. 07-15-2008, 09:50 AM #7
    OOC
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    Is it sweating over most of the plenum, or just in a few locations? My old plenum portions (sheet metal, paper wrapped insulation) in the crawl space never sweats except where the insualtion is torn or loose. The new round flex duct the installer used to replace a portion of the plenum sweats over most of it. I have a vented crawl space, with a pretty decent moisture barrier on the ground.
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  8. 07-15-2008, 09:59 AM #8
    richmod
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    Quote Originally Posted by OOC View Post
    Is it sweating over most of the plenum, or just in a few locations? My old plenum portions (sheet metal, paper wrapped insulation) in the crawl space never sweats except where the insualtion is torn or loose. The new round flex duct the installer used to replace a portion of the plenum sweats over most of it. I have a vented crawl space, with a pretty decent moisture barrier on the ground.
    My plenum is sheet metal and is NOT insulated - should it be? Only the ductwork is insulated.
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  9. 07-15-2008, 10:06 AM #9
    superd77
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    Is your crawlspace vented??

    Quote Originally Posted by richmod View Post
    Yes, no, and not really.

    Maybe I'm dense, but just making sure - it is normal, correct?

    Ducts sweat in crawlspaces in the south. May need to and insulation.
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  10. 07-15-2008, 10:07 AM #10
    superd77
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    Quote Originally Posted by richmod View Post
    My plenum is sheet metal and is NOT insulated - should it be? Only the ductwork is insulated.

    YEP!!!
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  11. 07-15-2008, 10:21 AM #11
    richmod
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    Quote Originally Posted by superd77 View Post
    YEP!!!
    What are the consequences of consensation if I don't insulate the plenum?
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  12. 07-15-2008, 12:47 PM #12
    superd77
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    Guess What You'll Be Breathing For The Next Few Years!!!

    Quote Originally Posted by richmod View Post
    What are the consequences of consensation if I don't insulate the plenum?

    MOLD AND MILDEW!!!!!!!
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  13. 07-15-2008, 07:57 PM #13
    cnpro18
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    What is the temp. diff between the supply and the return. Coil could be too cold.
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