We touched a similar topic a few days ago regarding siding – you’re taking on a big investment, and you typically want to know how long that investment can be expected to last before you’re going to need to consider repairs and improvements.
Today, we’re going to talk about something a bit more complicated – windows.
Modern windows are designed to be energy-efficient and durable. They also will not typically *ever* break unless they get hit by some type of large object. Modern windows are immensely durable, at least as far as the glass is concerned.
But issues can arise with leaks. Over time, seals can weaken, materials can degrade, and air leaks may develop. Now, the windows that are made today are nothing like the windows of the past, and installation style and quality can also affect longevity. Full frame double pane windows could, at least theoretically, take so many decades to leak that you are unlikely to still live in the property when there is a problem. Still, for the sake of discussion, let’s pretend that you are very young and plan to live in the property until you are very old. How long can you expect your window to last?
Average Timeframe for Air Leakage in Modern Windows
The lifespan of a window before it starts leaking air depends on several factors, including the window material, installation quality, climate conditions, and maintenance. The first signs of air leakage can appear at different intervals depending on the type and quality of the window. Below is a general estimate of when homeowners might expect air leaks to develop:
- Vinyl Windows (15 to 25 Years) – Vinyl windows are affordable and low-maintenance, but their seals can degrade over time due to heat expansion and contraction. Air leaks may start forming around 15 to 25 years, especially if the original sealant breaks down.
- Wood Windows (20 to 30 Years) – Wood windows are long-lasting but require consistent upkeep. Without proper maintenance, gaps may develop in the frames or seals within 15 to 20 years. Well-maintained wood windows can last over 30 years before air leakage becomes a concern.
- Aluminum Windows (20 to 30 Years) – Aluminum is strong and resistant to warping, but its metal frame can conduct heat, causing sealants to weaken over time. Air leaks may start appearing after 20 to 30 years, particularly if the thermal breaks inside the frame degrade.
- Fiberglass Windows (30+ Years) – Fiberglass windows expand and contract at nearly the same rate as glass, reducing the strain on seals. They are one of the most durable window options, often lasting 30 years or more before significant air leakage occurs.
Even in these situations, leaks are uncommon. What really makes a difference is installation style and seal. Full frame windows, also known as new construction windows, are built into the property. This makes it much less likely for leaks to occur. Retrofit, on the other hand, are installed into the hole left behind by the existing window, which increases the odds that a leak may occur. However, high quality installation (like we provide here at Christian Construction) can reduce this risk dramatically.
How to Prevent Air Leakage in Windows
To extend the lifespan of modern windows and prevent air leaks, homeowners should take proactive steps such as:
- Inspecting windows annually for drafts, condensation between panes, or visible gaps.
- Reapplying caulk or weatherstripping around the frame as needed to seal small gaps.
- Keeping windows clean and clear of debris to prevent dirt from compromising the seals.
- Ensuring proper drainage around windows to prevent water damage to the seals and frame.
- Replacing windows when necessary if drafts become significant or energy bills increase noticeably.
While modern windows are designed to last decades, air leakage can start occurring as early as 15 to 25 years depending on the material and environmental factors. Routine maintenance and early repairs can help homeowners maximize the lifespan of their windows and maintain energy efficiency for as long as possible. If you’d like new windows, or need help with repair, please reach out to Christian Construction, today.
