I don’t think there is enough information to make a definative answer.
Could be a manufacturer defect in that particular panel.
Could be a thicker material than the rest of the siding.
Might have been damaged and replaced with a different manufacturer material than the original siding.
Might be installed tight rather than loose like the rest of the siding.
Might have been replaced by home owner and glued in place rather than installed properly (sounds strange I know, but trust me I have seen home owners do this)
It’s too uniform (looks like an entire panel) to be a major concern. I would probably note it to myself, take photos, and move on.
I would like to start by commending everyone for their input in this brainteaser. This is a perfect example of why we wanted to form this section in the NACHI bulletin board. I applaud all of you. There are going to be things that we just cannot explain because of the limitations that we are bound by. However, in future inspections one of you may encounter the solution to this question and will enlighten the majority with your wisdom.
A little bit of tension has erupted on this thread since its inception because of previous posts and I sincerely hope that we can work past this. Everyone has an opinion and a theory. Let’s be tolerant of one another. This is new to all of us and to the rest of the world. There is no expert in this field yet. Those that taught us what we know have admitted that they have achieved where they are by trial and error. We all have a perspective and an opinion. If you post it, be prepared to support your theory. Anyone questioning your theory is not attacking you, rather trying to broaden our perspective.
I did look behind the slip joint but did not see anything.
I’m quite certain that the dew point temperature was well below 85° which was the ambient outdoor temperature.
I tried to find them, but they are on another computer. Basically we’re just looking at one section of vinyl.
I changed it to rainbow to accentuate the scan.
By the way, I have found some better pallets in QuickView versus quick report for some applications. I will post this later in another thread.
As for other than black and white scans, we use what we have to, to depict the point were trying to make. It should be noted that any other setting degrades resolution. But the more you play with your scan, the better you may be able to relate the issue to your client.
The heat at the roofline is because there is a cathedral ceiling. Also there was some deficient insulation in the attic.
The sheathing behind the vinyl seemed rather consistent for normal construction. Good call!
It took thermal scans on the interior wall and did not discover any anomalies from the inside. I could only see the temperature difference on the exterior vinyl siding layer. Good point!
There is no gas line in the wall. The temperature difference appears to be isolated to one sheet of vinyl siding. Good point!
I agree. I gathered as much information as I could. There is no significant deficiency associated with this condition. There was no supportive testing of any kind to direct a further evaluation. We are just trying to see if anyone out there has come across this situation and has found an answer to this situation.
Nothing that I could determine through a noninvasive examination.
I also had these thoughts. Good consideration.
Do you own a borescope? A small hole can show alot. Also I learned to not use the rainbow color pallette on the camera during a ITC Building Science course. You will get the best resolution fron the Grey scale. Not as exciting as the rainbow but much better for figuring out anomalies. Try this yourself and you will see a difference. Also remember Emissivity and focus are essential to good thermograms. What time of day was the IR taken?
Yes, I do own a bore scope. I did look through the slip joint of the siding but did not find anything substantial. In this particular case, I do not feel there is a significant deficiency but I am very interested in what caused the thermal anomaly seen.
I used the grayscale during the inspection but changed it afterwards in my computer program to enhance temperature change and boundary. Most people have a hard time seeing things in black-and-white so enhancing the scan in color makes the temperature gradient more obvious to the untrained eye. You are correct, resolution is much higher in the grayscale. Rainbow (which is used extensively in advertising infrared equipment) has the least resolution but has a greater WOW factor.
I use color in the manual mode when I’m doing fast walk through inspections just to look for specific issues, such as overheated electrical circuits or to verify air flow from HVAC supply air registers. It shows up faster that way. Then I change back and adjust the camera if I find a problem.
Focus is, emissivity is not essential to good thermograms. Emissivity is only necessary to determine the actual versus apparent temperatures. The a bolometer (if focused) will record the same data in a camera regardless of your emissivity settings.