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: 1514

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

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

Videos

  • Add Videos
  • View All

Latest Activity

Efficiency First California posted a blog post

Building a Clean Energy Future, Respect for the People Who Will Build It

You don’t need to spend a great of time deal in the policy world before you hear a conversation…See More
17 hours ago
Profile IconDavid G. Tamutus and Sharon Block joined Home Energy Pros
17 hours ago
Gary Reed added a discussion to the group Job Board
Thumbnail

HOME ENERGY ADVISORS WANTED (NEW YORK STATE: Saratoga & Glens Falls Region)

We are currently seeking experienced HOME ENERGY ADVISEOS to join the Jack Hall Plumbing &…See More
yesterday
Profile IconGary Reed and Kurt Shafer joined Diane Chojnowski's group
Thumbnail

Job Board

This group is for posting jobs related to all aspects of the home performance industry including…See More
yesterday
Ron Sarrick liked Energy Wise Solutions's discussion What causes a temperature plane in a home
yesterday
Kurt Shafer added a discussion to the group Job Board
Thumbnail

Installers for Whole House Fans in Various Cities

Invisco Whole House Fan Company in Temecula CA sells the highest performance fans in history. The…See More
yesterday
Kurt Shafer posted a blog post

First Rooftop Whole House Fan for Homes without Attics

Eichler was one of the most famous Mid Century Modern home builders in the 50s and 60s. His homes…See More
yesterday
Travis Lundberg replied to angela stanzione's discussion Used Weatherization and auditing equipment for sale in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Do you still happen to have a blower door fan, frame and fabric still for sale?  If so please…"
yesterday

Home Energy Pros

Welcome to Home Energy Pros – the unique digital community by and for those who work in the home energy performance arena.

Home Energy Pros was founded by the developers of Home Energy Saver Pro (supported by the U.S. Department of Energy) and brought to you in partnership with Home Energy magazine.  Home Energy Pros is sponsored by the Better Buildings Residential Network. Please honor our Guidelines

© 2017   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service