Hi All

Wanted 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 double 2x6 or 8 top plate.

DO you agree?  The customer's pain was condensation on the windows.  WIndows were well installed with minimum leakage. The house was very tight, which I believe is the problem..not this.

Tags: ir, windows

Views: 439

Replies to This Discussion

Master shows!

John, Thanks for the review in Home Energy 101.  Sometimes, as auditors, we get so enamored with the technology, we forget the basics.  Comments like this, keep my feet firmly on the ground, and improved my audit results.

 

 

Matthew, this is not thermal bridging or else it would look like the wall studs and the window header. This is a result of running the blower door in a tight house where air coming in at the soffitt vents is pulled into the building through penetrations in the drywall. Take the same shot before the blower door has been run and it will look a lot more normal.

This is not thermal bridging and it has nothing to do with the blower door.  This is the ceiling plane meeting the wall plane, and this is thin insulation at this area combined with possibley a slight breeze blowing or convection causing cold air to ride up under the first couple of inches of attic insulation.  The very dark spot every 2 feet corresponds to the roof trusses/rafters and the week insulation adjacent to them. In the mid-Atlantic we are required to install hurricane clips - metal clips that hold the trusses/rafter down to the top plates.  We see the conducted cold from the metal as a dark spot every 2 feet even if it is not connected between with a dark area.  The blower door would have caused the cold air to come down the wall/ceiling joint into the wall - but this is not the case, and thermal bridging would have made all the studs show as much as the top plates.

Ed Minch

Slight Breeze?  He said the bower door was running. 

Chad

As I said:

"The blower door would have caused the cold air to come down the wall/ceiling joint into the wall - but this is not the case, and thermal bridging would have made all the studs show as much as the top plates."

There is no connection of this area to the blower door through the attic.  The only possible connection is from the bottom of the wall at the baseboard or through receptacles, etc in the wall, then up through the wall to the open wall/ceiling joint where the cold areas are.  If this were happening, the cold would extend down as "icy fingers" into the wall below, but it is not.

Ed

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

Joshua Moore replied to Jennifer Luitwieler's discussion Google+//Will it SAVE THE WORLD? in the group Social Media and Energy Efficiency
"Good to hear we're not alone. I think it was such a headache for us that we shelved dealing…"
2 hours ago
Everblue replied to Jennifer Luitwieler's discussion Google+//Will it SAVE THE WORLD? in the group Social Media and Energy Efficiency
"Hey Joshua, we've had the same problem with YouTube and Google+. It is infuriating! In fact,…"
2 hours ago
ichko Ichko Rachev is now a member of Home Energy Pros
2 hours ago
Marie Fuentes posted events
3 hours ago
Bud Poll replied to Chad Mcaulife's discussion BPI QCI Cert.
"I can't think of any test I've ever taken where I wasn't able to determine what I…"
20 hours ago
jerry gentile replied to Chad Mcaulife's discussion BPI QCI Cert.
"you are spot on my friend-- during the exam I said this is ridiculous--- I have bpi certs for…"
yesterday
Eric Kjelshus commented on Jeremy Begley's blog post The Home Envelope : Does it Really Matter in a Heat Loss Caculation
"IT all matters,  I lot of sealing,  A lot of air barrier.  A lot of "R" A…"
yesterday
Michael Dunseith posted a status
"BPI Infiltration and Duct leakage (IDL) Certified"
yesterday

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service