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  1. #1
    Join Date
    Mar 2007
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    Spring City/Surrounding Philadelphia area
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    3,473

    Default Discoloration/Corrosion on HVAC Ducts and Copper Pipes

    This was in an 11 year old townhouse. Only the front room in the basement was not finished but drywall was installed on the stud wall in the front room so I had no view of the backside labeling on the drywall in this room. The copper plumbing lines and the HVAC ducts in this front room only had a lot of dark staining and patina on the pipes and a white stain and rusting on the ducts. But copper pipes in the middle utility closet in the basement had no such staining and were shiny and had the typical copper appearance. I did get a pic of the backside labeling of the drywall in the middle room with the copper pipes that looked fine but I really wanted to see what the drywall label in that front room said.

    The first thing that came to mind was chinese drywall but I have never heard of any of it making its way to Pennsylvania but I guess it is not out of the question. But I don't know if 11 years ago was the time frame in which chinese drywall start showing up in the United States. And from pics I looked at for chinese drywall and the damage it creates, this does not appear to the same.

    Thoughts?

    FRONT ROOM


    FRONT ROOM


    FRONT ROOM


    FRONT ROOM


    MIDDLE ROOM


    MIDDLE ROOM DRYWALL


    Similar Threads:
    Last edited by Nick Ostrowski; 06-26-2015 at 04:39 AM.
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    "It takes a big man to cry. It takes an even bigger man to laugh at that man". - Jack Handey

  2. #2
    Join Date
    Mar 2007
    Location
    Spring Hill (Nashville), TN
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    Default Re: Discoloration/Corrosion on HVAC Ducts and Copper Pipes

    I don't think that that is from problematic drywall… The patina is not consistent with what I have seen in homes with Chinese drywall.. Something was off gassing in that room. Could have been somebody cooking with chemicals(Meth) or something similar… Pool and yard chemicals normally will turn copper a green patina but it would be all over and not isolated.

    That's about all I have!!

    Scott Patterson, ACI
    Spring Hill, TN
    www.traceinspections.com

  3. #3
    Join Date
    Mar 2007
    Location
    Windsor Ontario
    Posts
    363

    Default Re: Discoloration/Corrosion on HVAC Ducts and Copper Pipes

    Quote Originally Posted by Scott Patterson View Post
    I don't think that that is from problematic drywall… The patina is not consistent with what I have seen in homes with Chinese drywall.. Something was off gassing in that room. Could have been somebody cooking with chemicals(Meth) or something similar… Pool and yard chemicals normally will turn copper a green patina but it would be all over and not isolated.

    That's about all I have!!
    I agree with Scott's comment. I have experienced (seen) similar conditions where "bleach" caused corrosion to metal ductwork and piping. It has also been acknowledged to shorten the life span of a heat exchanger on a furnace.

    Is there a laundry area at or near the locations? A cap left off a bleach container could be the culprit.


  4. #4
    Join Date
    Mar 2007
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    Spring Hill (Nashville), TN
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    Default Re: Discoloration/Corrosion on HVAC Ducts and Copper Pipes

    I think Claude hit it! Bleach would do exactly what we are seeing. Might be that they even sprayed the area with bleach to kill some mold, etc…??

    Scott Patterson, ACI
    Spring Hill, TN
    www.traceinspections.com

  5. #5
    Join Date
    Mar 2007
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    Spring City/Surrounding Philadelphia area
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    Default Re: Discoloration/Corrosion on HVAC Ducts and Copper Pipes

    Thanks for the feedback guys. No laundry facilities in the basement in this house. The laundry closet was in the 2nd floor hallway.

    "It takes a big man to cry. It takes an even bigger man to laugh at that man". - Jack Handey

  6. #6
    Join Date
    May 2008
    Location
    Madison Heights, MI
    Posts
    32

    Default Re: Discoloration/Corrosion on HVAC Ducts and Copper Pipes

    If the corrosion is on the cold-water pipes but not the hot, it could be from condensation in a damp basement. This will also happen on the supply ducts when the A/C is running.

    Also look around for a beautician's chair and sink. Some of the chemicals those folks use would peel the paint off a locomotive.


  7. #7
    Join Date
    Feb 2013
    Location
    NY
    Posts
    48

    Default Re: Discoloration/Corrosion on HVAC Ducts and Copper Pipes

    Quote Originally Posted by Nick Ostrowski View Post
    Thanks for the feedback guys. No laundry facilities in the basement in this house. The laundry closet was in the 2nd floor hallway.
    Does the house have a pool ?


  8. #8
    Join Date
    May 2010
    Location
    No. San Diego Co., CA
    Posts
    562

    Default Re: Discoloration/Corrosion on HVAC Ducts and Copper Pipes

    I'm thinking maybe a fumigant 'bomb'...?


  9. #9
    Join Date
    Mar 2007
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    Spring City/Surrounding Philadelphia area
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    Default Re: Discoloration/Corrosion on HVAC Ducts and Copper Pipes

    No beauticians sink, no pool.

    "It takes a big man to cry. It takes an even bigger man to laugh at that man". - Jack Handey

  10. #10
    Join Date
    Feb 2008
    Location
    Caledon, Ontario
    Posts
    5,005

    Default Re: Discoloration/Corrosion on HVAC Ducts and Copper Pipes

    https://www.youtube.com/watch?v=9NOkQ93XlFM&app=desktop

    Humidity problem in that area of the basement, water vapour coming up from concrete floor?


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