APRIL SPECIAL: Buy One, Get One 25% Off Plus Flexible Payment Options. See Details

Banner image showing homes with doors and windows from Signature Window and Door Replacement Banner image showing homes with doors and windows from Signature Window and Door Replacement

Common Causes of Seal Failure on Windows

replacement windows in Seattle, WA

Energy efficient windows have multiple panes of glass, inert gas fills, special coatings, and insulating frames. They are meant to prevent drafts of hot or cold air from coming inside. They also block unwanted radiant heat transfer and help keep cooled or heated air inside. But like most products, the seals on home windows will not last forever. Eventually, they will wear out and homeowners will need to consider replacement windows in Seattle, WA. These are the leading causes of seal failure:

1. Age

The seals on windows simply wear out over time. As caulk ages, it hardens and cracks. Weatherstripping gets worn down. Eventually, the window will lose the inert gas between the panes. And the gaps in the assembly will result in air and moisture leaks. In some cases, homeowners can visit the hardware store and get supplies to reapply caulk and weather stripping. But once the inert gas dissipates the only way to restore energy efficiency is with replacement windows.

Read also: Common Misconceptions About Fiberglass Windows

2. Temperature Fluctuations

Another common factor in window failure is extreme temperature fluctuations. On old windows, the air between the panes will expand when heated by the sun and cause solar pumping. If the glass bows out slightly and puts pressure on the seals. The opposite can happen in the cold. The air contracts and the glass concave putting pressure on the seals in the other direction. This is why windows in climates with both extremes tend to wear out faster. Fortunately, modern windows have inert gas fills that do not fluctuate due to temperature changes, which makes the seals on new windows more stable.

3. Moisture Damage

The seals on most window replacement Seattle are meant to be weather resistant. But unfortunately, they have limitations. If the materials are constantly exposed to water the seals will begin to lift away from the glass and frames. This is made worse by seals that are not flush with the frame. And seals wear out even faster if the moisture freezes and unfreezes.

Read also: Choosing the Functional Features of Replacement Windows

4. Mold

Mold is another common cause of window seal failure. Mold will start out small with small sports of growth or discoloration. But if left too long the mold will begin to eat away at caulk and weather stripping. Luckily, if caught in the early stages, homeowners can try cleaning mold away with gentle detergents or vinegar before it does too much damage.

5. Poor Maintenance

Low maintenance windows should be routinely cleaned to remain in top condition. This means following the manufacturers’ guidelines and avoiding the use of abrasives, harsh chemicals, and power washers. Otherwise, regular cleaning and maintenance will do more harm than good.

6. Improper Installation

replacement windows in Seattle, WA

Unfortunately one of the leading causes of premature window failure is faulty installation. Those wanting to install windows on their own should understand it is meticulous work that requires precision, skill, training, and proper tools. Poor window installation could not only ruin the window but also cause extensive damage to the substructures of the home as well.

If you are tired of high energy bills and leaky windows consider upgrading with replacement windows in Seattle, WA. Contact Signature Window & Door Replacement for a safe, hassle-free consultation.

See What Your Neighbors Are Saying

Signature Window & Door Replacement place picture
4.9
Based on 184 reviews
powered by Google
rachel mf profile picture
rachel mf
17:04 06 Mar 26
I cannot praise Signature highly enough. We hired them in 2012 to replace all of our windows and two sliding doors - the work was excellent and we love our Simonton windows. We just hired them again to rebuild our two-story entryway and install a Perva door and new windows. From the very thorough conversations with our salesperson, Vitaliy, to the scheduling with the office staff, to the actual installation - everything is as professional and high quality as you can find. We gathered quotes from three other companies but none of them went to any effort to truly lay out how the job would be accomplished. Photos show the old & new interior side, and the new exterior. Still needs painting but we're so happy!
G Zenkin profile picture
G Zenkin
04:19 04 Mar 26
After an extensive vetting process and comparing multiple options, I confidently chose Signature Windows & Doors for my home, and they absolutely delivered. The Marvin brand windows they installed are beautiful and of incredibly high quality—the craftsmanship speaks for itself. Beyond the great product, the installation process was truly exceptional. The crew was professional, precise, and made the entire project seamless from start to finish. I highly recommend them to anyone looking for top-tier windows and flawless execution. I had a fantastic experience with Signature Windows & Doors.
Michele V profile picture
Michele V
00:13 26 Feb 26
We called our project "The Window From Hell." It was a HUGE trapezoid window up high in a 2-story living room, and it needed to be replaced after its seal failed. I got bids, and was the most impressed with Danny L at Signature Windows. We had a tight deadline because the home was going on the market and access to the window, especially in the rain, was really challenging. Meeting the deadline, and the safety of the installers, were non-negotiable. Danny came out the very next day to measure the Window From Hell and, not only did he give me the best price, but his company was the only one that had all the scaffolding equipment readily available at no extra charge. The window arrived sooner than expected, and installation was quickly scheduled to meet the deadline. Then we hit a snag: some epic rain made the cedar roof too slippery for safe conditions. Brent and his crew of expert (and very brave) installers rigged up a safe way to haul this brand-new Mother of ALL Windows up to the second floor and install it using very long ladders, secure scaffolding, and harnesses. I think we had 4 or 5 installers for this job. It took all day to get the old Window From Hell out and the new Mother of All Windows installed. But what a job! Perfect caulk lines, perfect cleaning of the glass, perfect clean-up of the job site, indoors and out. Job done ON TIME, SAFELY, and at an excellent price. If Signature can handle my Window From Hell, I am very confident they can install ordinary double-hung windows that exceed your expectations for quality, price, timeliness, and workmanship. I highly recommend Signature Windows.
Robert Horn profile picture
Robert Horn
01:35 19 Feb 26
I highly recommend Signature. Windows look great, we are really happy with our installers too, they picked up everything each day and were real craftsmen, they took pride in the work they were doing for us.
Leanne Bough profile picture
Leanne Bough
23:41 12 Feb 26
Signature windows was wonderful to work with from the sale through the installation.
Dana B profile picture
Dana B
18:02 25 Nov 25
Everything from the initial consultation, regular updates on my order and installation was wonderful. The most recent installation was the third time I've had Signature replace old windows and I've been so pleased every time. They took the time to explain which windows needed replacement and provided options without any sales pressure. It's so nice to work with a company that believes in great customer service and offers quality products.
Amy Dahlin profile picture
Amy Dahlin
16:47 23 Oct 25
We have chosen to work with Danny and his team at Signature Window & Door twice now. We love the quality of the windows and the help they provide in the design process all the way to the finished installation. We put in a 15' folding door at our last home. It was a showstopper! Highly recommend them to bring your home back to life with beautiful windows that are built to last!
Pam Moser profile picture
Pam Moser
22:08 18 Feb 25
We bought a house that needed all new windows & sliding glass doors replaced. So we did our research and visited window replacement companies to see & touch different window & screen types. We decided to work with Signature Window primarily based on customer service as we received during the research & planning process with Office personnel (friendly, helpful, responsive) & Sales team (product knowledge, design assistance, open & honest).

1st Project (Aug 24) - 8 windows & 1 Sliding Door
2nd Project (Feb 25) - 1 ceiling to floor large window & 2 windows
Product of windows & door was excellent - we are extremely happy.

The customer service experience was superb. We worked with Sales Rep, Scheduler, Window Measuring Rep & Installers - all were friendly, open & honest, communicative, assisted with design & product knowledgeable. Installers did an awesome job with project cleanliness & kept busy all day long.

We are extremely satisfied with our overall experience with window replacement with Signature Windows 🥰
happy couple holding hands outside home
happy couple holding hands outside home
Our Reviews See What Your Neighbors Are Saying

From the beginning to the end of this project, the Customer Care team was top-notch. They easily accommodated my difficult schedule, the requirements of the historical building I live in, and were super responsive to all my questions. The installation team was flawless. They worked around…

Kelly R.

Kelly R.

Signature always comes through, their products and work is always top notch, yes, they are a premium service but you get what you pay for, and I really enjoy having great doors and windows to my home.

Seth S.

Seth S.

I’m extremely pleased with Signature Windows. From start to finish the whole process has been wonderful. After the windows were shipped they were installed in less than a week (about 20 windows). The crew, Raymond and Walter (and Eric one of the days) was amazing. They…

Mary H.

Mary H.

Working with Signature was a pleasure. The design and product selection process was collaborative and thoughtful. The communication from start to finish was excellent. The installation crew was friendly, efficient, and skilled. We replaced a very old and very oddly installed back door on our house,…

Marc H.

Marc H.

We used this company several years ago to replace the upstairs windows and recently replaced the downstairs ones. Their costumer service is outstanding and the work was done very proffesional. Everyone involved with the project did an excellent job and we are very happy with the…

Valentina M.

Valentina M.

Signature Window & Door Replacement
Privacy Overview

This website uses cookies so that we can provide you with the best user experience possible. Cookie information is stored in your browser and performs functions such as recognising you when you return to our website and helping our team to understand which sections of the website you find most interesting and useful.