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 thing out and use it! In most places, on most mornings, you can get successful "winter" images; if not, keep the home closed up for the night and add a bit of heat in the morning before you arrive.

Once the day warms, heat flow and thermal patterns will reverse. On days when the sun is intense, direct solar loading will make exterior work impossible during the daytime and even interior work will require patience and understanding of how the sun affects things. But it is not impossible by any means!

A few hours after sunset if the evening is warm and the AC on, imaging can be spectacular from both inside and outside.

With a blower door and the building depressurized, air leakage will nearly always be detectable. The image below of a house in the Bay area on a warm early afternoon shows poorly placed figberglass batts in a cathedral ceiling.

Want to learn more? My colleague, Matt Schwoegler, will be presenting a (paid) webinar on July 6 on Warm Weather Thermography. See http://www.thesnellgroup.com/Content/thermal-solutions-conference.aspx for details. You can also see his recent excellent article in the May/June issue of Home Energy Magazine.

I'd encourage all readers to take their imagers to every single job. If you don't get good images, think about why you didn't and, when possible, modify your protocols so the next time you have a better chance. 

John

The Snell Group

www.IRTalk.com

www.thesnellgroup.com

Views: 511

Replies to This Discussion

I've got a few inspections in two weeks time.  With my Ti32 and a blower door, I am good to go.  (Sometimes I really don't even need the blower door.   It's all about having the right training, and the right tools at your disposal.

If my memory is good, RESNET talk of a deltaT of only 3°F for conducting an infrared inspection with blower door: it happens many times and its' about a 100 mK NETD. here are some image with my Ti32. infiltration may be warm or hot, but you can see it almost always

 

 

 

The 3F delta is for locating air leakage under RESNET. For locating insulation issues, an 18F delta is required. I agree we can often get by with less of a difference if we understand the conditions, know what we are doing and have a more sensitive imager—I favor something around 50mK, which is much more than 2X the sensitivity of a 100mK system. As always, Davide, very nice images!
Typically there are several reasons "hot work" is not as easy as working with cooler temperatures, and Matt will discuss these in his webinar next week. First, the delta-temperature (inside to outside) is usually not as great. Second, the sun loads the walls. While this may help, often is just confuses things. Finally, as materials cool quickly after a sunny day, differences in thermal capacitance reveal themselves; again, this may help but is often confusing. The attached image shows an exterior in the summer on a clear evening with AC running. The cement board siding has cooled quickly. The 3.5" FG batt insulation is in place. Is it working or only working poorly is it an issue of seeing cooling siding/still warm framing or a combination of the factors? I find getting good results from summer thermography typically requires experience and skill, patience and a sensitive imaging system.

I have been setting up to inspect about 200 attics that are most likely completely out of compliance with ours(and any) reputable program specs.  While testing a couple of remote camera configurations, I made a pass through the attic with my IR camera.  As my attic was done correctly, The baffles (as shown on the left) were easy to spot.

 

RSS

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.

Latest Activity

Christopher Morin's blog post was featured

5 Things New Energy Efficiency HVAC Contractors Need to Know

1. Do not sell on Price! Use 'Simple Payback'The price of High-efficient equipment will undoubtedly…See More
7 hours ago
Jim Gunshinan's blog post was featured
7 hours ago
Profile IconDan Liska and Rob Moreno joined Home Energy Pros
7 hours ago
Jim Gunshinan posted a blog post
10 hours ago
Kim Tanner commented on Diane Chojnowski's group Home Energy Pros on Twitter
"Follow The Energy Conservatory on Twitter! We'll follow…"
13 hours ago
Kim Tanner joined Diane Chojnowski's group
Thumbnail

Home Energy Pros on Twitter

We've created a twitter list of members of Home Energy Pros who tweet!See More
13 hours ago
Bud Poll replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"Hi Kaushal, First step is to understand where you are in terms of energy costs.  If current…"
15 hours ago
Kaushal Bharath Raju posted a discussion

Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.

We have a small 1940s single level house (1005sqf) in Berkeley, California that is in need of a…See More
23 hours ago
Christopher Morin posted a blog post

5 Things New Energy Efficiency HVAC Contractors Need to Know

1. Do not sell on Price! Use 'Simple Payback'The price of High-efficient equipment will undoubtedly…See More
yesterday
David Eggleton commented on David Eggleton's group Considering Permaculture &/or Transition
"In August 2014, in Minnesota, there's another unprecedented opportunity to meet and mix with a…"
yesterday
Glen Gallo commented on Jim Gunshinan's blog post Energy Upgrade California—Up Close and Personal
"Nate, RE: Duct test On my own home and a rental I have tested more than once over the last many…"
yesterday
Profile Iconangela hines and Charles Goldman joined Home Energy Pros
yesterday

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service