Expert Eye Needed

Replies to This Discussion

Permalink Reply by John Nicholas on April 2, 2011 at 6:37am

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.

 

 

Permalink Reply by Bill Bradbury on June 17, 2011 at 8:06am

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.

Permalink Reply by Ed Minch on June 30, 2011 at 9:39am

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

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