Drafty Windows: How to Tell a Seal Has Failed Before Winter
If you've walked past a window in your house and felt a cold draft even though it's closed, that's not your imagination. It's usually a sign that the seal around the glass or the frame has failed, and once that happens, it only gets worse as the temperature drops.
Windows are built with layers of protection: the glass itself, the seal between panes on double or triple-pane windows, and the caulking and weather stripping around the frame. Any one of those can wear out over time, and Indiana's swing between humid summers and freezing winters is hard on all of them. When a seal fails, warm air leaks out, cold air leaks in, and your furnace has to work harder just to keep up.
There are a few clear signs to check for before the first hard freeze. Fogging or condensation between the panes of glass is one of the most obvious. If you see haze or moisture trapped inside the glass itself, not on the surface, the seal between the panes has broken and the insulating gas has escaped. That window will never perform the way it used to, no matter how much you clean it.
Feel around the frame with your hand on a windy day. If you notice air movement around the edges, the caulking or weather stripping has likely cracked or pulled away. Look at the caulk line itself too. Cracked, shrinking, or missing caulk around the frame is an easy fix if caught early, but left alone it lets moisture behind the trim where it can cause rot you won't see until it's a bigger problem.
Check how the window operates. A window that used to open and close smoothly but now sticks, or one that doesn't latch tightly anymore, often has a frame that's shifted or warped. That gap, even a small one, is enough to let conditioned air escape all winter long.
A quick way to test any window is the dollar bill trick: close the window on a piece of paper and pull it out. If it slides out with little resistance, the seal isn't holding tight enough. Do this at a few spots around the frame, not just one corner.
Catching a failed seal now, while it's still fall, means you have time to decide whether it's a caulk-and-weather-strip fix or a sign that the window itself needs to be replaced before winter bills start climbing. Waiting until January means living with the draft and the higher heating costs until you get around to it.
Feeling drafts around your windows? Contact Homegrown Construction for a free window inspection and estimate.
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