How to Fix a Drafty Window
Homeowners who notice a drafty window might groan, thinking they’ll need to shell out for a window replacement. But more often than not, an air leak issue isn’t due to the glass itself, but with a window’s framing or sealant — and it’s a relatively cheap fix that you might even be able to accomplish yourself.
Before committing to the cost and disruption of an entire window replacement, here’s how to assess whether you can reseal a window and restore its efficiency.
Signs Your Windows Need Work
Windows and sealings are durable. If they were installed correctly and haven’t received any obvious damage (say, a line drive shattering the glass), a window can last upward of 20 years before needing any work.
But over your windows’ lifetimes, look out for these signs that something needs fixing:
- Condensation between panes of double-glazed windows. The clearest and most definite sign that your window has an air leak.
- Difficulty opening or closing windows. A sticky window may indicate a warped sash or misaligned frame.
- Noticeable drafts or inconsistent indoor temperatures. Windows with air leaks are the likeliest culprit.
- Visible physical damage. Cracked glass, a broken or bent frame, or a loose pane all point to a faulty window.
Replace or Reseal?
Unless the glass itself is cracked, you probably don’t need to replace a window to resolve a draft. A window’s frame and seal dictate its energy efficiency and prevent draftiness. Resealing, weather-stripping, or restoring the frame can buy you time and deliver much of the performance benefit of full replacement at far lower cost.
And if the glass is faulty, many manufacturers offer long-term or lifetime warranties. Check with them before purchasing a whole new window from a third party.
But likely, a drafty window is due to the frame or sealing, and it’s not hard to re-caulk it yourself. Use a utility knife or box cutter to remove the old sealant, then use a warm, soapy rag to clean the trim. Apply new silicone caulk where the frame meets the trim, both interior and exterior (and make sure you’re using interior/exterior caulk).
Resealing your home’s windows is essential to energy efficiency in your home. Here are some other ways to save on energy costs this winter.
