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  1. #1
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    Nov 2014
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    minas gerais
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    Default problem with a thermocam

    i used a moisture meter and identified water in part of the wall.
    I try to see this in a thermocamera when I was doing a inside scan.
    I know it's needded a difference of Temperature called delta T, so I heated all the wall. But it doesn´t work.

    Do I need to heat al the house´s interior or just the wall?
    Wich equipment could do that?

    Inspection Referral SOC

  2. #2
    Join Date
    Mar 2007
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    Capistrano Beach, CA
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    Default

    Hello mutzgrila mutzgrila,

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  3. #3
    Join Date
    Mar 2007
    Location
    Spring Hill (Nashville), TN
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    Default Re: problem with a thermocam

    Quote Originally Posted by mutzgrila mutzgrila View Post
    i used a moisture meter and identified water in part of the wall.
    I try to see this in a thermocamera when I was doing a inside scan.
    I know it's needded a difference of Temperature called delta T, so I heated all the wall. But it doesn´t work.

    Do I need to heat al the house´s interior or just the wall?
    Wich equipment could do that?
    It might be the camera. What brand and model camera are you using?

    If you can post a picture of the wet wall that might help others to provide some help.

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

  4. #4
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    26,252

    Default Re: problem with a thermocam

    Quote Originally Posted by mutzgrila mutzgrila View Post
    I try to see this in a thermocamera when I was doing a inside scan.
    I know it's needded a difference of Temperature called delta T, so I heated all the wall. But it doesn´t work.

    Do I need to heat al the house´s interior or just the wall?
    Wich equipment could do that?
    You destroyed the evidence (so to speak) for the infrared camera to see by heating the wall - the infrared camera is looking for temperature differences, and heating the wall removed those temperature differences you were looking for.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  5. #5
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    Mar 2007
    Location
    Spring Hill (Nashville), TN
    Posts
    5,847

    Default Re: problem with a thermocam

    Quote Originally Posted by Jerry Peck View Post
    You destroyed the evidence (so to speak) for the infrared camera to see by heating the wall - the infrared camera is looking for temperature differences, and heating the wall removed those temperature differences you were looking for.
    It could also be that the moisture meter provided a false positive. Maybe a piece of metal, nail, screws, wire, nail plate, etc... The wall might not have any moisture in it!

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

  6. #6
    Join Date
    Feb 2008
    Location
    New York
    Posts
    869

    Default Re: problem with a thermocam

    Heating the wall can sometimes help locate moisture (with a thermal cam).

    As stated; you are measuring temperature [temperature differentials] and everything changes temperature at a different rate, water being the slowest. So if there is a wet area in the wall, and you turn up the heat in the room, the wet areas will change temperature at a different rate of speed then the dry areas.

    If the water has been in the wall for a while, it has the chance to equalize temperature with the wall. By changing the temperature of the wall, you are creating a differential.

    How did you heat the wall? How long did you wait when heating the wall? How did you identify the wet areas with a moisture meter? (surface scan or probes).

    Steven Turetsky, UID #16000002314
    homeinspectionsnewyork.com
    eifsinspectionsnewyork.com

  7. #7
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    Mar 2007
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    Ormond Beach, Florida
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    Default Re: problem with a thermocam

    Quote Originally Posted by Steven Turetsky View Post
    How did you heat the wall? How long did you wait when heating the wall?
    Those are the questions I was thinking of ... but did not ask ... as they will either (as you said) help find the issues (like the sun heating a wall - the interior parts of the wall show up better) or remove the evidence by bringing the entire wall structure to the same temperature (which is what I was suspecting he did) and this no differences show up.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  8. #8
    Join Date
    Feb 2008
    Location
    New York
    Posts
    869

    Default Re: problem with a thermocam

    Quote Originally Posted by Jerry Peck View Post
    Those are the questions I was thinking of ... but did not ask ... as they will either (as you said) help find the issues (like the sun heating a wall - the interior parts of the wall show up better) or remove the evidence by bringing the entire wall structure to the same temperature (which is what I was suspecting he did) and this no differences show up.
    I agree, there are unanswered questions. Assuming the wall is wet, I wonder what in the area could be contributing since there are other enhancements that may be helpful.

    Quote Originally Posted by mutzgrila mutzgrila View Post
    i used a moisture meter and identified water in part of the wall. I try to see this in a thermocamera when I was doing a inside scan.
    How did you do this? Maybe the problem is not the cam, but the meter.



    Quote Originally Posted by mutzgrila mutzgrila View Post
    I know it's needded a difference of Temperature called delta T, so I heated all the wall. But it doesn´t work.
    Do I need to heat al the house´s interior or just the wall?
    Wich equipment could do that?
    You only heated one wall? How did you do this?

    If I was conducting that test, I would heat the whole house and would use the house's heating system to do this. If there was no heating system, I would heat the whole room using some type of portable heating system. Depending on the conditions, normally in about 1/2 hour I would start scanning, and again in 1/2 hour increments until I was satisfied.

    Depending upon the conditions, I may ask a client to blast the heat 1/2 hour (or so) before I arrive.

    Steven Turetsky, UID #16000002314
    homeinspectionsnewyork.com
    eifsinspectionsnewyork.com

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