This test determines variations in surface temperature and is very effective in identifying areas needing repair without having to dismantle or uncover walls or other structural elements. While the house is still pressurized and there is a 10-degree temperature difference between the inside and outside, we tour the house with the infrared camera to check for air leaks, missing or poorly installed insulation, thermal bypasses, thermal bridges, and moisture issues. We document problem spots with both thermal imaging and digital cameras.
This is an interesting video that describes one of our processes for how we utilize this technology.