Where Heating Energy Actually Escapes
The Department of Energy estimates that air leakage through windows, doors, and utility penetrations accounts for 25% to 30% of residential heating loss during freezing winter months. Locating and sealing gaps is the fastest way to improve comfort.
The Flame Detection Test
On a windy day, slowly move a lighted candle or stick of incense around exterior door frames and window sashes. Where the flame wavers or smoke blows sideways, unsealed drafts are penetrating your thermal envelope.
Self-Adhesive Foam vs Silicone V-Strip
- Foam Tape: Inexpensive and easy to apply, but breaks down under friction and UV exposure after one season.
- Silicone V-Strip: Folds into a spring-like V shape that flexes against door jambs, providing an airtight seal that lasts 5–10 years.
Installing Heavy-Duty Door Bottom Sweeps
The gap beneath exterior doors is often 1/2 inch to 3/4 inch high. Screw an aluminum door sweep with a flexible triple-fin silicone blade to the bottom exterior face of the door so it brushes snugly against the threshold.
Ensure combustion appliances (furnaces, water heaters, wood stoves) have sufficient makeup air intake before sealing homes too tightly. Install functional carbon monoxide detectors on every level.
Editorial Transparency Notice
Our guides are independently researched by the Raviro editorial desk. We do not accept sponsored product placements or paid promotional endorsements. If you spot an error or have an update regarding local safety codes, please contact our desk at [email protected].