Draft-proofing Electrical Penetrations in your home
Draft-proofing your home is one of the most cost-effective ways to lower your Calgary heating bills and improve indoor comfort. While most homeowners focus on windows and doors, electrical boxes and light fixtures are often overlooked "hidden" leaks. Because these fixtures penetrate your drywall, they act as chimneys, allowing warm air to escape into your attic and walls. By sealing these gaps from the inside, you can significantly reduce cold drafts and prevent moisture from reaching your attic—a common cause of attic frost in our Alberta climate.
To draft-proof your wall outlets and light switches, the most efficient method is using pre-cut foam gaskets. First, turn off the power at the breaker for safety. Unscrew the faceplate, place the fire-rated foam gasket over the outlet or switch, and then screw the plate back on. For larger gaps around the electrical box itself, a small bead of paintable caulk or a non-expansive spray foam can be used to fill the space between the box and the drywall. This creates a continuous air barrier that stops the "stack effect" from pulling cold air through your walls.
When it comes to ceiling-mounted light fixtures and pot lights, the process requires a bit more care. Standard pot lights are notorious for leaking heat directly into the attic. If you have access from below, you can install recessed light covers or "vapour barriers" designed to sit over the fixture. For surface-mounted lights, removing the fixture and applying a bead of acoustical sealant or caulk around the wire hole and the rim of the electrical box can make a world of difference. Ensure any materials used are heat-rated and compliant with local building codes to maintain fire safety. This is something you could ask your friendly insulation company, Affordable Home Insulators, to quote with an attic upgrade.
By taking the time to seal these small openings, you are reinforcing your home’s thermal envelope. While these DIY steps are excellent for immediate comfort, they work best when paired with professional-grade attic insulation. At www.homeinsulators.com, we specialize in identifying these thermal bypasses and providing comprehensive insulation upgrades that keep Calgary homes warm all winter long. Don't let your expensive heat vanish through your light switches—start sealing today and feel the difference.