How to Soundproof Old Windows

Are you tired of being constantly disturbed by outside noise when you’re trying to relax or work at home? Perhaps you have old windows that let in drafts and sound from the street, making it difficult to achieve peace and quiet. Luckily, there are several solutions to soundproofing old windows that can help you reduce noise and increase comfort in your living space. 

How to Soundproof Old Windows? Old windows can be a significant source of noise pollution. To soundproof them, you can try using acoustic curtains, sealing gaps with weatherstripping or acoustic sealant, or installing secondary glazing or window inserts. These methods can effectively reduce unwanted noise and improve your living environment.

In this blog, we’ll explore some of the best methods for soundproofing old windows, so you can enjoy a quieter, more serene home environment.

Types of Window Noise

Types of Window Noise

Old windows can be a major source of noise pollution, making it difficult to concentrate, relax, or sleep. To effectively soundproof your old windows, it is important to understand the different types of noise that can enter your home. Here are the three main types of window noise: airborne noise, impact noise, and flanking noise.

Airborne Noise

Airborne noise is the most common type of noise that enters through old windows. This type of noise includes sounds that travel through the air, such as traffic noise, barking dogs, and music. To reduce airborne noise, you need to add mass and density to your windows.

This can be achieved by adding soundproof curtains, double-glazed windows, or window inserts made of materials such as acrylic or laminated glass. These materials can help to block the noise from entering your home and reduce the amount of sound that can travel through your windows.

Impact Noise

Impact noise is caused by vibrations that travel through solid objects, such as footsteps, doors slamming, or objects falling on the ground. This type of noise can be particularly annoying if you live in an apartment building or a shared house.

To reduce impact noise, you need to add a barrier between the source of the noise and your windows. This can be achieved by adding soundproofing materials such as mass-loaded vinyl, acoustic foam, or rubber underlayments to your floors.

These materials can absorb the impact noise and prevent it from traveling through the building’s structure and into your windows.

Flanking Noise

Flanking noise is the noise that travels around or over sound barriers, such as walls or windows. This type of noise can be difficult to identify, as it may not originate from a single source. Flanking noise can enter your home through gaps in your windows, doors, or walls, or even through the ceiling or floor.

To reduce flanking noise, you need to identify the source of the noise and seal any gaps or openings. This can be achieved by using weather stripping, caulk, or acoustic sealant to seal gaps around your windows, doors, or walls.

You can also add acoustic panels or insulation to your walls or ceilings to reduce the amount of noise that can travel through them.

By understanding the different types of window noise and how they enter your home, you can take the necessary steps to soundproof your old windows and enjoy a more peaceful and comfortable living environment.

Soundproofing Materials

Soundproofing Materials

If you live in a house with old windows, chances are you’re familiar with the noise pollution that seeps in through them. Soundproofing your windows is a great way to reduce the amount of external noise that enters your home.

There are several soundproofing materials available on the market that can help you achieve this goal. In this section, we’ll discuss some of the most popular soundproofing materials for old windows.


Weatherstripping is a cost-effective way to soundproof your old windows. It’s a simple process of sealing the gaps between the window and the frame using adhesive-backed foam tape, vinyl, or rubber. This method can also help you to save on energy bills by reducing air leaks and improving insulation.

Acoustic Caulk

Acoustic caulk is a specialized type of caulk that is designed to absorb sound waves. It’s an effective material for soundproofing old windows because it fills in any gaps between the window and the frame. Acoustic caulk is easy to apply and can be used in conjunction with other soundproofing materials like weatherstripping.

Window Inserts

Window inserts are an effective way to soundproof your old windows without replacing them. They are essentially a second pane of glass that fits inside your existing window frame. This creates an insulating barrier that helps to reduce external noise. Window inserts come in a variety of materials like acrylic, polycarbonate, and glass.

Acoustic Curtains

Acoustic curtains are an attractive and effective way to soundproof your old windows. They are made from heavy materials like velvet, wool, or polyester and have a sound-absorbing core. These curtains can be hung over your windows and provide an additional layer of insulation to help reduce external noise.

Soundproof Window Films

Soundproof window films are a cost-effective and easy-to-install way to soundproof your old windows. These films are made from a thin layer of vinyl and can be applied directly to the window glass. The film helps to reduce external noise by absorbing sound waves. It’s important to note that these films don’t provide the same level of soundproofing as some other materials, but they are a good option for those on a budget.

Step by Step Guide to Soundproofing Old Windows

Step by Step Guide to Soundproofing Old Windows

If you’re living in an older home, you may have noticed that your windows are not as soundproof as modern ones. This can be a problem, especially if you live in a busy area with lots of traffic or loud neighbors. Fortunately, there are several ways to soundproof old windows and reduce noise pollution in your home.

Inspect and assess your windows

The first step in soundproofing your old windows is to inspect them carefully. Check for any gaps, cracks, or other openings that might be letting sound in. Look for areas where the frame meets the wall, as well as any gaps around the glass itself. Make a note of any areas that need attention so that you can address them later.

Seal gaps and cracks 

Once you’ve identified any gaps or cracks, you’ll need to seal them up to prevent sound from coming through. One option is to use weatherstripping to seal gaps around the frame. This can be a simple and affordable solution that can make a big difference in reducing noise.

Acoustic caulk is another option that can be used to fill in larger gaps or cracks. It’s specially designed to absorb sound and can be applied to both the frame and the glass.

Install window inserts or secondary glazing

If you’re looking for a more comprehensive solution, you may want to consider installing window inserts or secondary glazing. These are additional layers of glass that are installed on the interior of the existing window.

They provide an extra barrier against noise and can significantly reduce the amount of sound that enters your home. Window inserts are typically removable, which makes them a good option for renters or anyone who doesn’t want to make permanent changes to their home.

Add soundproof window film

Another option for soundproofing old windows is to add soundproof window film. This is a thin, transparent film that can be applied directly to the glass. It works by absorbing and reflecting sound waves, which reduces the amount of noise that enters your home.

Soundproof window film is a cost-effective solution that can be installed quickly and easily.

Hang acoustic curtains or blinds

You may want to consider hanging acoustic curtains or blinds. These are specially designed to absorb sound and can be a great addition to any room. They can be used on their own or in conjunction with other soundproofing measures.

Acoustic curtains or blinds can be a stylish and practical solution that can help you reduce noise pollution and create a more peaceful living environment.

Maintenance and Upkeep

Maintenance and Upkeep

To ensure the effectiveness of your soundproofing efforts, it’s important to maintain and upkeep your windows regularly. This includes inspecting them for any damage, replacing worn or damaged weatherstripping and seals, and cleaning and maintaining soundproofing materials. Here’s a closer look at each of these tasks:

Regularly inspect windows for damage

Regular inspection of your windows is crucial in maintaining their soundproofing ability. Any damage to the windows, such as cracks or holes, can significantly reduce their ability to block outside noise. Inspect your windows thoroughly for any signs of damage, paying special attention to the frames and panes. If you notice any damage, make sure to repair or replace the window as soon as possible.

Replace worn or damaged weatherstripping and seals

Weatherstripping and seals play a critical role in soundproofing your windows. Over time, these materials can wear out or become damaged, compromising their ability to block noise. Check the weatherstripping and seals around your windows regularly and replace any that are worn or damaged. This will help ensure that your windows remain soundproof and energy-efficient.

Clean and maintain soundproofing materials

Regular cleaning and maintenance of your soundproofing materials can help ensure their longevity and effectiveness. Depending on the type of soundproofing material you’re using, you may need to vacuum or wipe them down regularly to remove any dust or debris.

For more heavy-duty cleaning, follow the manufacturer’s instructions carefully. Moreover, make sure to inspect your soundproofing materials regularly for any signs of damage, such as tears or holes. If you notice any damage, repair or replace the material as soon as possible to maintain its soundproofing ability.

Evaluating the Effectiveness of Your Soundproofing Efforts

After putting in the effort and investment to soundproof your old windows, it’s essential to evaluate the effectiveness of your soundproofing efforts. This will help you identify any remaining noise issues and adjust your soundproofing strategy accordingly. Here are some of the key factors to consider when evaluating the effectiveness of your soundproofing efforts.

Measuring noise reduction

To evaluate the effectiveness of your soundproofing efforts, you need to measure the amount of noise reduction achieved. This can be done using a sound level meter, which measures the decibel levels of sound. Take measurements before and after soundproofing to see the difference in decibel levels.

The amount of noise reduction achieved will depend on the quality and thickness of the soundproofing materials used. You should aim for a noise reduction of at least 30 decibels to create a significant difference in sound levels.

Identifying remaining noise issues

After measuring the noise reduction achieved, it’s essential to identify any remaining noise issues. Walk around the room and listen for any noise that is still coming through the windows. It’s also a good idea to test the soundproofing during different times of the day to account for any changes in noise levels.

If you still notice noise coming through the windows, you may need to add additional layers of soundproofing material or reseal any gaps or cracks in the window frame.

Adjusting your soundproofing strategy as needed

Based on your evaluation, you may need to adjust your soundproofing strategy to achieve the desired level of noise reduction. If you’re not achieving the desired level of noise reduction, you may need to consider upgrading to higher quality soundproofing materials or adding additional layers of soundproofing material.

If you notice that the majority of the noise is coming through the window frame or gaps, you may need to focus on resealing or caulking the gaps to create a tighter seal.

When to Consider Window Replacement

Old windows can be a source of many problems, including heat loss, energy inefficiency, and noise pollution. If you live in a busy area with heavy traffic or near an airport, soundproofing your windows might be a viable solution to reduce noise levels. But, in some cases, window replacement might be the best option. In the following paragraphs, we are discussing when it’s appropriate to consider replacing your old windows and factors to consider when making this decision.

Assessing the cost-effectiveness of soundproofing vs. replacement

The cost-effectiveness of soundproofing versus window replacement depends on various factors, including the age of your windows, their condition, and your budget. While soundproofing is less expensive than window replacement, it may not be cost-effective in the long run. For instance, if your windows are in poor condition, soundproofing may not make a significant difference in reducing noise levels. In this case, replacing your windows with double or triple-pane glass may be a more viable option. Soundproofing materials may deteriorate over time, requiring you to replace them more frequently.

Signs that it’s time to replace your old windows

There are several signs that indicate it’s time to replace your old windows, including:

  1. Drafts: If you feel drafts coming in through your windows, it’s a sign that they’re not sealing correctly, and you’re losing energy efficiency.
  2. Condensation: Condensation on the inside or outside of your windows indicates that there’s too much moisture in your home, and your windows aren’t doing their job correctly.
  3. Difficulty opening and closing: If your windows are difficult to open and close, it’s a sign that they’re starting to fail.
  4. Noise pollution: If you’re experiencing excessive noise levels from outside, even after soundproofing, it may be a sign that your windows need to be replaced with double or triple-pane glass.
  5. Visible damage: If your windows have visible damage, such as cracks, warping, or decay, it’s time to consider replacing them.

Choosing soundproof windows for your home

When choosing soundproof windows for your home, there are several factors to consider. Firstly, you should look for windows with a high Sound Transmission Class (STC) rating. The higher the STC rating, the better the window’s ability to block out noise. Secondly, you should consider the type of glass used in the windows. Double or triple-pane glass with insulating gas between the panes is a great option for soundproofing. Also, laminated glass or acoustic glass is designed specifically for soundproofing and can further reduce noise levels.

Other factors to consider include the frame material, as well as the installation process. Vinyl frames are a popular choice for their insulating properties, while fiberglass frames are durable and long-lasting. Professional installation is essential to ensure that your soundproof windows are installed correctly and effectively reduce noise levels.


As we wrap up our discussion on soundproofing old windows, it’s important to take a moment to consider the benefits of investing in this home improvement project. Not only does soundproofing your old windows reduce noise pollution and increase your overall comfort at home, but it can also improve the energy efficiency of your home and potentially even increase its resale value.

Soundproofing your windows is not a one-and-done project. To ensure lasting results, it’s crucial to maintain your soundproofed windows over time. This means regularly inspecting the seals, weatherstripping, and caulk for any signs of wear or damage, and promptly repairing or replacing as needed. With proper maintenance, your soundproofed windows can continue to provide you with a peaceful and comfortable home environment for years to come.

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Brendan Ratliff
Brendan Ratliff

As a soundproofing and acoustical professional, I have helped new homeowners, builders and remodelers with their projects. I also help contractors/designers learn how to properly install soundproofing in their clients homes.
I enjoy helping people understand the process of soundproofing and acoustical construction. is a one-stop solution for all of your soundproofing related questions.