Attic Air Sealing
Sealing and insulating your attic is one of the most critical steps to ensuring that your home is properly air sealed. Most attics have insulation which helps reduce heat loss. But it won’t stop the air flow. Insulation can actually conceal cracks, gaps and holes through which the pressurized air from your home is driven into the attic. Check for staining in the insulation, which is an indicator of an air leak.
Older types of recessed lighting can be extremely leaky and difficult to make airtight. Often, the best solution is to build an airtight box of flame-resistant material at least 3 inches larger the light’s housing to cover the portion of the fixture that is in the attic. You will need to pay attention to fire code regulations.
The top floor ceiling in your home acts as a containment barrier to rising warm air. Any small hole or a gap in that area will create an outlet for warm air to escape. As the air exits through the top floor ceiling, it will create a slight negative pressure inside your house and the air leaving will need to be replaced. That air will come from the outside of the house and will need to be heated/cooled – requiring additional use of your furnace/AC, which costs you money. Checking for cracks, holes of small openings in the attic floor will result in substantial energy savings.