This Arlington VA home had a large cantilever extending beyond the footprint of the foundation. A cantilever can add square footage for upper floors compared to the foundational floor by extending outward but the design often leaves homeowners experiencing comfort issues. An uninsulated or unsealed cantilever can allow external air and temperatures to come in through the rim joists of the home and will often result in colder or hotter than wanted floors. We remove the panels framing the bottom of the cantilever and use spray foam to seal up and insulate.