Feeling a draft at the front door is one of the most common winter complaints we hear in Ottawa. Here is how to track down where the cold is getting in — and what actually fixes it.
If you can feel winter standing in your own hallway, you are not imagining it. A draft around an exterior door is one of the most common calls we get once the temperature drops, and the cause is almost always something small that has quietly worn out. The good news is that a drafty door is one of the most satisfying things to fix — the difference in comfort is immediate, and you stop paying to heat the outdoors.
Cold air does not come through a solid door. It comes through the gaps around it — the thin lines where the door meets the frame, where the bottom meets the threshold, and where the frame itself meets the wall. Find those gaps and you have found your draft.
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1. Worn weatherstripping. The flexible seal lining your door frame is the single biggest culprit. New, it compresses into a soft cushion that blocks air completely. After a few Ottawa winters it goes hard, cracks, or flattens permanently — and once it stops springing back, it stops sealing. Run your finger along it: if it feels brittle, torn, or pancake-flat, it is doing nothing.
2. A failed door sweep. The sweep is the strip along the bottom edge that bridges the gap to the threshold. Sweeps take the most abuse — dragged across the threshold thousands of times a year — so they wear out first. If you can see daylight under your closed door, your sweep has lost the battle.
3. A misaligned door. Even perfect weatherstripping cannot seal a door that no longer closes flush. As houses settle and hinges loosen, a door can pull away from the frame on one side, leaving a wedge-shaped gap that the seal cannot reach across. This is the draft people chase for years without solving, because they keep replacing weatherstripping instead of fixing the alignment.
4. The threshold. The threshold at the base of the door can settle, wear, or lose its own seal. Adjustable thresholds have screws that raise the centre to meet the sweep — if yours has dropped, raising it can close the gap in minutes.
5. Gaps where the frame meets the wall. The trim hides the joint between the door frame and the rough opening in your wall. If that joint was never properly insulated or the exterior caulk has cracked, cold air bypasses the door entirely and travels through the wall cavity around it.
You do not need special tools. Wait for a cold, breezy day — that pressure difference makes leaks obvious — then close the door and work your way around the edge:
Mark each leak with a piece of tape as you find it. The pattern usually tells the story: leaks only at the bottom point to the sweep or threshold; leaks down one whole side point to alignment; leaks all the way around point to tired weatherstripping.
Swapping a door sweep or replacing peel-and-stick weatherstripping is a reasonable DIY job if the door itself sits square in the frame. Raising an adjustable threshold is usually just a screwdriver and a few turns. These are worth trying first.
Call a professional when the draft survives new weatherstripping, when the door has to be lifted or shouldered to latch, when the gap is uneven from top to bottom, or when the frame itself has shifted or rotted. Those are alignment and frame issues — the door needs to be re-hung, the strike re-set, or the frame repaired so the door seats against its seal everywhere at once. Throwing more weatherstripping at a crooked door never works, and we see a lot of homeowners spend a winter learning that the hard way.
Our heating season runs roughly half the year, and the temperature gap between inside and outside is often forty degrees or more. That makes every gap leak harder than it would in a milder climate, and it means a draft is not just uncomfortable — it is a steady drain on your heating bill from November through April. Worse, the cold air meeting warm indoor humidity at the door edge can cause condensation and frost on the frame, which over time rots wood and feeds mould. Sealing the door early protects both your comfort and the door itself.
If this article points to a problem you're dealing with right now, these pages go deeper — or you can browse the rest of the blog and request a free quote:
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