Feeling a Breeze Indoors? That Gap Under Your Front Door Is Costing You Money Every Month
Do you know the worst part about a drafty front door? It is not the cold. It is opening your heating bill in January and seeing a number that makes you physically wince. I used to think my house was just poorly insulated. Turns out, the front door alone was leaking enough air to equal a six-inch hole in the wall.
Weatherstripping a door takes about twenty minutes and maybe fifteen dollars in materials. I did mine two winters ago and the difference was immediate — the entryway stopped feeling like a walk-in freezer and my heating bill dropped by roughly ten percent the following month.
Find the Leaks First
Before you buy anything, find where the air is actually coming through. Close the door on a sunny day and run your hand along all four edges. You will feel cold air on any gaps. For smaller leaks you cannot feel, use a lit incense stick or a candle — the smoke will flicker or blow sideways wherever air is moving through.
The most common leak points: the bottom sweep (where the door meets the threshold), the top corner on the hinge side (where the door pulls away slightly when closed), and the lock side in the middle (where the door can bow slightly if it has warped over time).
The Three Types of Weatherstripping You Actually Need
Door sweep for the bottom: A metal or rubber strip that screws onto the bottom of the door and seals against the threshold. Replace the old one if it is cracked, deformed, or leaves visible daylight underneath.
Adhesive foam tape for the frame: This is the peel-and-stick stuff that goes around the door frame where the door presses against it. Get the closed-cell foam kind, not the open-cell sponge. Closed cell does not absorb water and lasts years longer.
V-strip or tension seal for warped doors: If your door does not sit perfectly flat against the frame, use a flexible V-shaped strip that compresses where the door touches and expands into the gaps. This is what fixed my top corner leak that foam tape could not reach.
The Install Order Matters
Do the sweep first, then the sides, then the top. The sweep establishes the door’s position when closed. If you do the sides first and the new sweep is slightly thicker, the door will not close properly and you will have to redo everything. Ask me how I know.
Quick Summary: Find leaks with a candle or incense smoke, install a door sweep first, then closed-cell foam tape around the frame, and use V-strip for warped sections — the whole job costs under $15 and can cut heating bills noticeably.