Are You a Building Science Sleuth?

Every two weeks, Lakeshore Home Diagnostics will be posting a building science puzzle in our blog. Your job is to correctly diagnose the problem and come up with possible solutions. Send your analysis and potential solution(s) to Good, and not so good interpretations will be posted the following week, using first names only, to identify submitter. Professional interpretation and solutions will also be posted.  Keep checking back with us.

What in the Sam Hill is going on here?

How do we fix it?

Home efficiency sleuth


  • Exterior Bedroom Wall
  • Temperature of “spot” is displayed in the upper left-hand corner of image
  • Outside Temperature: 36°C
  • Indoor Temperature: 68°
  • Blower door is being run in depressurization mode @ 25 Pa.