INFRARED THERMOGRAPHY USERS

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INFRARED THERMOGRAPHY USERS

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

Members: 186
Latest Activity: Apr 5

Discussion Forum

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:http://www.saige.it/Details.aspx?id=41This 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 opinion..am 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 May 31, 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 www.IRTalk.com 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 7, 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

IR and Moisture Meters

Started by Bret Monroe. Last reply by allen p tanner Jun 23, 2011. 12 Replies

As many of you know the new RESNET Guidelines are being worked on and I am advocating for the use of Moisture Meters to ensure potential serious moisture problems in sidewalls and building substrate material is not being overlooked when identified…Continue

Comment Wall

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Comment by Rod Hoff on November 11, 2010 at 8:27am
TJ
Yes, to see a thermal drop due to evaporative cooling where the moisture issued is water intrusion the surface would have to be permeable. The moisture must reach the surface. Condensation, of course, occurs on the surface and therefore is not affected by permeance.
Comment by TJ Ewing on November 10, 2010 at 7:45pm
Yep still here but was out of office all day today, just getting caught up on the flurry of input! Thanks so much for the questioning and ponderings Michael, Rod and Dale.

Just a note that the wall was not showing signs of surface water at the time the thermograms were taken.
- The bulletin board is flush with the wall, no standoffs.
- The wall is masonry block with an external brick veneer
- The interior of masonry is painted, unknown permeability. Drip marks are evident along the bottom of the bulletin board at the center area of interest
- At time of thermogram, Temp-in = 72, RH-in= 70% (at end of mass with >300 people inside), Temp-out=63, RH-out=64%. Again the wall surface wetness manifests only during summer on hot humid days.
- The heating system is water based, and does not provide cooling. No cooling at all in building.

Rod, the evaporative cooling water technique you outline is very interesting. So do I have it correct that you are saying if there is evaporative cooling and a non-permeable surface then we can rule out water intrusion? However if the surface is permeable we can’t rule out either intrusion or condensation?

What seems to make sense at this point is for further inspection by removal of the bulletin board. And as Dale aptly suggested, inspection at the beam pocket, and to determine a presence of a vapor barrier?
Comment by Michael Stuart on November 10, 2010 at 7:23pm
Dale, another good thought. I believe that the apparatus at the bottom is a heater system. Rod and I also asked the same questions about the bulletin board mounting.

TJ... are you still out there? ;-)
Comment by dale garren on November 10, 2010 at 3:04pm
has anyone checked the water barrier detail around that beam pocket in the masonary portion

what is the apparatus at base of wall?

is the bullitin board "stood off" from wall?
Comment by Michael Stuart on November 10, 2010 at 12:36pm
This is another of TJ's images of the situation... I just applied a low-temperature color alarm to highlight the area of concern.
Comment by Michael Stuart on November 10, 2010 at 12:33pm

Comment by Michael Stuart on November 10, 2010 at 12:31pm
Concrete masonry.
Comment by Rod Hoff on November 10, 2010 at 12:24pm
Are we looking at firred out sheetrock or masonry?
Comment by Michael Stuart on November 10, 2010 at 12:16pm
Thanks for jumping in, Rod! (I am glad that I am not the only one who asks lots of questions.) I believe that the wall is painted... but do not know how permeable the paint is.
Comment by Rod Hoff on November 10, 2010 at 10:19am
Thank you for the invite to join the discussion. If you have not heard of Restoration Consultants allow me please to introduce our company to you. It is owned by Jim Holland, who is well known in the water damage restoration industry. He has been a major player and influencer in the creation of the S500 (water damage restoration standards of practice) and S520 (mold remediation standards) Restoration Consultants Inc provides three services: (1) Environmental consulting, (2) training classes in water damage restoration and mold remediation plus a variety of other classes.. see www.restcon.com (3) distributor of Fluke IR cameras and training in the use of thermography for moisture investigations and building envelope investigations. I teach a 2 day Applied Thermography Training class and a self paced onlline course covering basically the same information. see www.moistureview.com

Relative to the discussion about the anomaly on the masonry wall, temperature differentials, as you know, can be the result of a host of things. It can be a result of evaporative cooling or it can be heat transmission issues (gain/loss). Evaporative cooling happens under the right circumstances as a result of water intrusion that reaches the surface or condensation on the surface. Assuming that a moisture meter was used to verify the presence of moisture (forgive me if you have already answered these questions in your discussions) the big question is 'what's the source?'. In the process of investigating the issue it would be critical to know the make up of the wall. Like Michael said: Is the information board flush with the wall or attached to the wall with strips? Is the wall sheetrock that is firred out from the masonry? And if so, is it painted or covered with vinyl wall paper? It would be helpful to know the ambient temperature inside and outside, the relative humidity inside and outside and the dew point inside and outside. This information can help (using a psychrometric chart) us determine the humidity ratio (specific humidity) and thus the vapor pressure. If there is no vapor barrier and the vapor pressure is greater outside than inside then there will be moisture movement from outside to inside.

To find out if evaporative cooling is happening at the moment you can spray a little water on the wall and use the camera to see if a temperature drop occurs (3-5 degrees probably). If evaporative cooling is happening then the next question is 'Is the surface permeable?'. If, for example, the surface is vinyl wall paper or some non-permeable surface then we can assume that the drop in temperature is not the result of evaporative cooling due to water intrusion. The positive reading on the moisture meter under these circumstances is probably a result of evaporative cooling due to condensation.

Another question would be relative to the type of mechanical heating unit. Is it a water based system or electrical? Does it provide cooling in the summer?

Sorry for all of the questions but the more questions we can ask the more likely we can come to a conclusion.
 

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Discussion Forum

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 May 31, 2013. 4 Replies

Infrared Image - What is it?

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

Timber Home with no effective air barrier

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

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