These Riverside, CT homeowners reported incredibly cold floors in the second floor of their home where the second level cantilevers slightly over the first. We sent one of our most knowledgeable home comfort experts Keith Saunders to the home in order to see what to do with the issue. The reason why this cantilever was allowing to much heat out of the home was because it had a layer of rigid foam insulation that was not air sealed, so it was allowing heated air to escape.
Keith recommended we install sprayable foam insulation between the floor joists that are cantilevering outward. This was done by our crew lead by Rudy Abel. They removed the siding underneath to expose the cavities then installed three inches of the foam to reach an R-value of about R-12. The closed cell foam expanded to fill all the gaps in the floor joists which will prevent heated air from escaping through this access point again.
The homeowners noticed right away the floors on the second floor were not nearly as cold as they had been in past winters! They continued to have additional insulation installed in their attic by Dr. Energy Saver of Connecticut.