This group is dedicated to knowledge sharing and discussion of infrared thermography for building sciences and energy applications.

Members: 193
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Discussion Forum

Having some fun with our cameras

Started by Mike Pagozalski. Last reply by Mike Pagozalski Jul 31. 2 Replies know I can't be the only person to just have some fun with thermography LOL.....figured a fun thread couldn't hurt in here.....I am level 2…Continue

New building thermography 360 pages ebook - including blower door and heat flux meter !

Started by Davide Lanzoni. Last reply by Don Fitchett Jan 10, 2015. 3 Replies

Link to buying and pdf preview page: is a rich handbook (over 300 pages in original printed edition, much more in this ebook) about thermography applied…Continue

Tags: door, airtightness, blower, infrared, building

Expert Eye Needed

Started by Matthew P. Last reply by Ed Minch Nov 15, 2014. 17 Replies

Hi AllWanted to get the opinion of an expert.Attached is a photo of a customer's window.... as you can see there is a large cold spot above the window... Here's my I right?The large horizontal cold spot is thermal bridging from the…Continue

Tags: windows, ir

Google Thermal View?

Started by Joshua Knittel. Last reply by tedkidd Jun 1, 2013. 4 Replies

As most of you know, there is more to an energy audit or energy rating (such as a HERS rating) than just the thermal imaging - but this start up company is using it to get a nationwide database going.........Here's a link to the article on…Continue

Tags: Audit, business, Energy, Google, imaging

Infrared Image - What is it?

Started by Fluke Thermal Imaging. Last reply by Dale Sherman Apr 26, 2012. 6 Replies

We thought it'd be fit to share this infrared image we received from group member, CK Ang, in New Zealand. Just wanted to spark some discussion here on what you guys think this image is of, and what the problem could be. A little background on the…Continue

Tags: Fluke, Ti55FT, telephoto, lens, Ang

Timber Home with no effective air barrier

Started by Davide Lanzoni. Last reply by Sean Lintow Sr Apr 11, 2012. 1 Reply

Hi folks,just another image of a brand new timber home without an effective air barrier, and without sealing tapes.…Continue

New article on infrared thermography

Started by John Snell. Last reply by Jim Klebes Nov 17, 2011. 1 Reply

The Journal of Light Construction has long been respected as a place where builders can educate themselves and share information. I was recently asked to write an article introducing their readers to thermography and how it can be used in the…Continue

Moisture detection, a fascinating thermal signature

Started by John Snell Sep 9, 2011. 0 Replies

I don't mean to derail folks from this website to ours (I often send folks here too!) but that is exactly what I'm going to do because has a fascinating discussion about thermal signatures of…Continue

New York first passivhaus ...

Started by Davide Lanzoni. Last reply by John Snell Aug 25, 2011. 4 Replies

... with windows with a better R-value than walls ?…Continue

Using thermal imagers in the summer

Started by John Snell. Last reply by Tyson Pischel Jul 8, 2011. 5 Replies

Too many thermographers leave their imagers in the case during the summer. This comes, in part, from the way we used to work when imagers were not nearly as sensitive and our understanding of how to use them was limited to winter work.Get the darned…Continue

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Comment by Michael Stuart on November 9, 2010 at 1:32pm
I'm going to also ask a friend of mine who is a thermographer/educator, specializing in "restoration and remediation" thermography down in Sacramento, to chime in. This is the kind of stuff where he excels.
Comment by Michael Stuart on November 9, 2010 at 1:23pm
Interesting... One more question... Is the bulletin board mounted directly to the wall, or is it mounted on any kind of standoffs at all? In other words, is there any appreciable "breathing air" between the board and the wall? No air flow and a wall that does not breath well would possibly lead to condensation issues... but would not necessarily explain the area above the bulletin board.

I guess my biggest question is why would there be an area conducive to condensation at this spot, and nowhere else? Why is this area "cooler" than other areas on the same masonry wall so that condensation will occur when the humidity arises?

Thinking out loud: I am wondering if an initial leak into the wall allowed enough moisture to enter that it just cannot dry out sufficiently (even though the initial leak may have been repaired).

Anyone want to step in with other comments, questions, or hypotheses?


Comment by TJ Ewing on November 9, 2010 at 10:38am
Hi Stuart,
thanks for the group clarification. I am still learning to 'think thermally.'

As for my "wet wall", I am leaning to the problem being a condensation issue versus leak. However a HERS rater friend stated it could be moisture draw from the outside to the inside through the brick and block? Here are the answers to your questions.

- Hard to tell if the anomaly goes all the way to the floor due to the heating unit, but it does go at least to the bottom of the bulletin board, and seems to be more concentrated behind the bulletin board (see images below). We plan to take it off for inspection.
- I don’t have an image of the ceiling adjacent to the wall. I did scan and saw no anomaly.
- I did scan the outside of the wall but again found no anomalies.
- There is an external roof runoff drain to a downspout on the outside of the wall, but no other support structures, berms or other influences.
- I have no info on the type of thermal barrier or vapor barrier used in the wall.
- The delta T was only about 10 degrees, and I plan to return for a second scan now that colder weather has arrived.
- See roof pic and thermogram below.

Here is the church’s rep’s articulation of the problem:
The wall has been a problem for many years. Whether there was a leak or not I'm not sure. Given the constant peeling, it was ASSUMED we might have had a roof leak and that (and other leaks) resulted in a new roof several years ago. Unfortunately, roof replacement did not stop the wet wall problem. To the best of my knowledge, the wall drips with moisture only in the summer months, particularly on hot, humid days. It tends to be along the whole wall, with heavier concentrations in the center.

Comment by Michael Stuart on November 9, 2010 at 12:04am

No... by all means... be as general or as specific as you would like. I don't know about the other members, but I find that both have a place in open discussion. I may have started this discussion forum, but I definitely do not propose to know everything about thermography or about buildings. We all have something to learn, and I just like to sit in the front row to be part of the discussion. That's the great thing about these forums! There is almost always a group of people that can complement each other in knowledge and experience.

All of the questions that I asked are actually questions that I would ask myself upon seeing an image like you presented on my imager. The thermal imager is nothing but a tool. Yes... it lets you see what you're eyes may not... but to gain the most from it, you still need to use your brain and ask a LOT of questions. (And on this forum, there are no "dumb questions".) To borrow a phrase from a colleague, you need to "Think Thermally", and try to understand all of the reasonable things that could be producing the thermal signature that you are seeing. Ask "Why?" always! Sometimes, you will be surprised that it may not have been what you had originally suspected. The more questions that you ask, the more confident you should be in your end analysis (in my opinion).

Does that make any sense? (or have I been drinking my own brand of infrared coolaid?) ;-)

With that being said, we should all probably refrain from listing specific addresses or buidling owners whenever possible. Other than that, I think that just about anything buildings and structures related is fair game. (...And probably the occasional "fun stuff" that comes with the territory.)

Any more details that you can provide about your wall? Go for it. (I'm sure that others may have questions too.)


Comment by TJ Ewing on November 8, 2010 at 11:01pm
Hi Stuart,
I hope I didn’t breach any etiquette by bringing up a specific case. If you would rather reserve comment space for general issues I understand. You may not have intended this group discussion to be so specific. I’ll message you directly and let you guide it from there.
Comment by Michael Stuart on November 8, 2010 at 1:19pm

Sorry for the "20 questions"... but... here you go:

Do you happen to have another image from further back? Or one with a slightly wider field of view? Does the anomaly continue down past the bulletin board to the floor or does it appear to stop mid-wall? Do you have any images of the ceiling area adjacent to the wall? Did you inspect the outside of the wall that corresponds to what you are seeing on the inside? Any downspouts, support structures, earthen berms, etc that may influence the thermal signatures on the wall? Does the wall "get wet" again after heavy rains? Any information on the type of thermal barrier and vapor barrier used in the wall? What was the Delta-T between the exterior of the wall and the interior surface? I take it that this section of the church has a low-slope roof. What kind of roof construction and materials? Standing water is never a good thing. (My first gut reaction is that there might be a roof leak that is entering the envelope and coming down the interior of this masonry wall, but without further investigation or answered questions, I would not venture to surmise more.)
Comment by TJ Ewing on November 8, 2010 at 12:31pm
Hi All,
anyone have thoughts on the attached pics of a church masonry wall with external brick facade? The internal wall is wet during summer which may indicate condensation but could also be a vapor drive from external to internal? The roof above does not drain well and had standing water from last rain fall. Any infrared considerations I should take into account when imaging masonry walls?
Thanks for any input/questions.

Comment by Michael Stuart on November 8, 2010 at 10:30am
In case you all have not visited the events section of HEP, I wanted to point out that one of the group's members, John Snell, will be giving a webinar for Energy Center of Wisconsin tomorrow:
(I learn something new every time that I hear him speak on infrared.)
Comment by Fluke Thermal Imaging on November 5, 2010 at 5:56pm
We're with John--thanks for creating this group, Michael. Excited to share thermography information & infrared images with group members! Hope everyone has a great weekend.
Comment by John Nicholas on November 5, 2010 at 9:32am
I completed my Level I training 5 weeks ago and I've had my camera for 4 weeks. I've audited several homes with the IR and Blower Door. I look forward to learning more about what works and what doesn't.

Members (193)


Discussion Forum

Having some fun with our cameras

Started by Mike Pagozalski. Last reply by Mike Pagozalski Jul 31. 2 Replies

Expert Eye Needed

Started by Matthew P. Last reply by Ed Minch Nov 15, 2014. 17 Replies

Google Thermal View?

Started by Joshua Knittel. Last reply by tedkidd Jun 1, 2013. 4 Replies

Infrared Image - What is it?

Started by Fluke Thermal Imaging. Last reply by Dale Sherman Apr 26, 2012. 6 Replies

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