5 Problems with Fiberglass Windows

5 Problems with Fiberglass Windows

Fiberglass is a newer material that is used in windows and doors. Fiberglass windows are durable, eco-friendly, sound-proof, and last longer than any other window material. But what are the downsides?

Various window materials have different limitations, and this also includes the downsides of fiberglass as well. It’s important to not go in blind to the common problems of a material or product that will be installed in your home for years to come. 

So, here are 5 fiberglass window problems you need to look out for.

5 Cons of Fiberglass


Exterior water leakages

Fiberglass windows leave space at the horizontal and vertical edges of the window panels. Because of this, some people may experience water leakages through these windows during rainy seasons. 

Fiberglass windows experience more leakage problems because don't have weep holes. Therefore, water will keep accumulating on the windows. The way to prevent this is to ensure sealants are done on the frames of the windows to fill the spaces left behind when fitting windows.

With this being said, fiberglass windows may not be the best choice for those who live in moist, wet environments.

Not as readily available as other window materials

If you look for wooden or metal windows you will easily find them on the market. That's not the case for Fiberglass windows. 

One of the common fiberglass window problems is that you will need to wait longer to get your windows supplied to you. Fiberglass windows are in less demand, so they typically take a bit more time to ship. 

To learn more about where you can find fiberglass windows, check out our post about some frequently asked questions about fiberglass.

Fiberglass is more expensive than other window materials

Initially, fiberglass windows will come out to be notably more expensive than other materials such as vinyl and wood. Especially when replacing several windows, the additional cost can start to add up quickly. Although fiberglass windows tend to even out the cost by being energy efficient and long-lasting, it may not be the best option for people who are looking for a more affordable overall project.

Fiberglass is vulnerable to ultraviolet (UV) ray damage

Although fiberglass windows outlast other windows, they don’t hold up so well to direct rays of sunlight. Some exposure to UV rays could lead to fading and warping of your fiberglass windows.

So what can you do to help protect your fiberglass windows from ultraviolet light? To start, you can ensure that you confirm with your manufacturer that your windows are powder-coated to withstand intense UV rays. This way you will avoid the cost of having to paint them later on, to camouflage any fading.

Color options are slim

When it comes to fiberglass windows, the color options can be rather limited. This is because fiberglass windows are typically tinted rather than painted. They are also especially susceptible to fading. It’s also worth noting that fiberglass windows should not be painted over when it’s time to touch them up when they start fading.

Deciding if fiberglass windows are best for your home

Now that we’ve gone over the problems of fiberglass windows, let’s look at some other considerations. This will help you decide whether or not fiberglass’s strengths are worth risking the potential problems of fiberglass windows.

Are fiberglass windows energy efficient?

Yes! Not only are fiberglass windows durable, but they are also extremely energy efficient and even regarded as the most energy efficient windows. Fiberglass windows excel at not allowing any cold air in (or out) as well as keeping the heat in during cold months. In return, you can typically expect to see a significant decrease on your energy bills.

Will fiberglass windows improve home value?

Since fiberglass is a more expensive material and can last up to 50 years with low maintenance, they can increase your home value. Additionally, fiberglass windows can potentially save you money by lasting considerably longer than their wood and vinyl counterparts, which typically last around 30 years.

February 06, 2023

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