I am a Home Inspector and Energy Auditor here in Chicago and my clients are always asking me why their homes are so drafty and their heat bills astronomical. The most common problem causing major comfort issues is air infiltration into the home.
A client wanted to know why the floor was so cold under his desk in the bedroom above the Foyer. He recently paid to have the entire home insulated with blown in cellulose, so naturally assumed that all the walls were filled right? WRONG!
During a blower door test/infrared inspection, my infrared camera revealed the answer in a few seconds. Although the home was supposedly “100% insulated” the contractor apparently missed the entire wall cavity to the left of the window in the Foyer, thereby causing cold air to infiltrate up the wall and across the ceiling joist bay causing the floor to be cold in this area. There were several other areas in the house that were missed or not filled 100%.
This is a good example of the benefit of having a Blower Door test/Infrared Camera inspection, especially before and after insulating. Firstly to locate the source of the air leaks to determine the best course of action and material to insulate with, and secondly to make sure the job was done correctly.
My infrared photo revealed the missing insulation to the left of the window and shows the path of cold air infiltration up the wall and then all along the ceiling (floor upstairs) explaining the cold floor above.