Message Board Thread - "TPO Roof Moisture Survey"

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TPO Roof Moisture Survey David Wix 10/27/2011
Has anyone had any experience performing infrared moisture surveys on white TPO membrane roof systems. Are there better times to scan i.e. early evenings, late evenings to get the best thermo images.
 
Re:TPO Roof Moisture Survey ron lucier 10/27/2011
David Wix wrote:
one had any experience performing infrared moisture surveys on white TPO membrane roof systems. Are there better times to scan i.e. early evenings, late evenings to get the best thermo images.
Your best bet is to watch the sky. If it is a clear day, get on the roof about an hour before sundown and start looking for thermal signatures. If it is a partially overcast day, start around sundown.

Of course this is highly dependant on what is underneath the TPO. What type of insulation is present? If there is a large mass, meaning several plies, you will have better success than if it is just over a single layer of insulation - your inspection window will be longer with a larger mass of insulation.

Upload some pictures of your success!
 
Re:TPO Roof Moisture Survey David Wix 10/27/2011
ron lucier wrote:
Your best bet is to watch the sky. If it is a clear day, get on the roof about an hour before sundown and start looking for thermal signatures. If it is a partially overcast day, start around sundown.

Of course this is highly dependant on what is underneath the TPO. What type of insulation is present? If there is a large mass, meaning several plies, you will have better success than if it is just over a single layer of insulation - your inspection window will be longer with a larger mass of insulation.

Upload some pictures of your success!
Thanks for the reply. The TPO single ply membrane is installed over ISO insulation. The roof is approximately 3 years old.
 
Re:TPO Roof Moisture Survey Bob Berry 10/28/2011
TPO used with polyiso is very difficult to survey, particularly if it is new. The polyiso is a closed cell structure and does not hold moisture well, this means that you are looking for a very suttle pattern. The TPO typically has a very high emissivity and is a mirror type reflector, so the cold reflections from the sky can be tricky, particularly with a LWIR system.

I agree with Rons suggestion regarding the timing of the survey.
 


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