Are Blackout Curtains Soundproof (Detailed Guide)

We all want our bedrooms to be very cozy and comfortable, the only thing we need to be concerned with is the noise level. Blackout curtains are heavy in materials and are designed to block out light which can be very useful if you live near a busy street, noisy neighbors or want a good night’s sleep. But how well do they actually block out noise?

Are Blackout Curtains Soundproof? Blackout curtains are available in many different fabrics and materials. Each fabric has its own soundproofing ability. Polyester, microfiber, wool, synthetic fiber blends and silk are all great choices for blackout curtains. All these fabrics are light-absorbing and will block out most outside noise.

Blackout curtains are a fairly common thing in homes. They are made to block out light and keep you cooler during the summer months. Not many people realize that blackout curtains can also help with noise problems. This article will look at blackout curtains, what they are, their features and how they work.

Do Blackout Curtains Block Sound?

Do Blackout Curtains Block Sound?

Blackout curtains are made of thick fabric that blocks out light, and they also have a lining that may block some noise. This is because the lining of blackout curtains is usually made of soft, dense fibers like cotton or polyester.

Blackout curtains are mainly designed to block light, not sound. The same is true for any other kind of curtain or shade.

The reason that blackout curtains work so well at blocking light is because they’re made from thick fabric that’s been lined with a layer of black material. That lining absorbs all the light coming through the fabric and blocks it from getting through to your eyes.

Blackout curtains are the best way to block out light, but they don’t completely block sound. If you’re looking for complete silence and darkness, you might want to consider installing double-pane windows or using thicker (or soundproof) curtains that are made from heavier material.

Science behind Soundproofing Blackout Curtains

Science behind Soundproofing Blackout Curtains

Blackout curtains are an essential addition to any bedroom or living space. They are designed to block out light and provide privacy, allowing you to sleep better and feel more secure. 

But do blackout curtains also work as soundproofing solutions? Let’s delve into the science behind soundproofing blackout curtains to find out.

How do blackout curtains work?

Blackout curtains are made of thick, opaque materials such as polyester, cotton, or velvet. They are designed to block out natural and artificial light sources, creating a dark and comfortable environment for sleeping or relaxing. 

The key to their effectiveness lies in their ability to absorb and deflect light, as well as insulate against heat and cold.

Soundproofing vs. Sound Absorption

It’s important to note that soundproofing and sound absorption are two different concepts. Soundproofing refers to the ability of a material or structure to block sound from entering or leaving a room. Sound absorption, on the other hand, refers to the ability of a material to absorb sound energy, reducing its overall volume.

Can blackout curtains really soundproof a room?

While blackout curtains are not specifically designed as soundproofing solutions, they can help to reduce the amount of noise that enters or leaves a room. The thick and heavy materials used in blackout curtains can absorb sound energy, reducing its overall volume and creating a quieter environment.

However, it’s important to note that blackout curtains are not as effective as dedicated soundproofing solutions, such as acoustic panels or sound barriers. To achieve maximum soundproofing benefits, you may need to combine blackout curtains with other soundproofing methods.

Factors to consider when using blackout curtains for soundproofing

When using blackout curtains as a soundproofing solution, there are a few factors to consider. Firstly, it’s important to choose the right type of blackout curtain, with thicker and heavier materials providing better sound absorption. 

Secondly, ensure that your curtains fit snugly against the walls and floor, leaving no gaps for sound to enter or escape. Finally, consider combining blackout curtains with other soundproofing methods for maximum effectiveness.

Blackout and Soundproof Curtains (Comparison)

Blackout and Soundproof Curtains (Comparison)

Blackout curtains are designed to keep the light out of a room. They are made from heavy cloth that blocks out most of the light. Soundproof curtains are designed to reduce noise from entering or exiting a room. They are made from thick fabric and often have padding between layers. 

Blackout curtains are a great option for those who want total darkness, but they don’t do much for sound. Soundproofing curtains, on the other hand, help block out noise as well as light. 

Blackout curtains and soundproof curtains are both useful for blocking out light and sound, but they do so in different ways. Here are some comparisons:

Balance of Light and Sound Blocking

Blackout curtains are designed to block out light completely, while soundproof curtains are designed to reduce the amount of sound that passes through them.

Blackout curtains can be made of many different types of fabric and have a variety of weights and textures, but they all have one thing in common: they absorb light. This means that they’re not transparent, so you can’t see through them if they’re closed. 

They also don’t let any light through once they’re closed, which means no more waking up with the sun in your eyes or having to turn on the lights during daytime naps.

Soundproof curtains are usually made of heavier, denser fabric than blackout curtains, which makes them better at blocking noise from outside sources such as traffic or airplanes. They do this because sound travels through air molecules as vibrations. 

Heavy fabrics trap those molecules more effectively than lighter ones, reducing their ability to vibrate against one another and thus reducing the amount of noise transmitted into your home or office from outside sources.

Light Blocking

Blackout curtains block light more than soundproof curtains, which still let in some light.

Soundproof curtains work by using a special fabric that muffles the sound coming through them. They’re ideal for people who live near busy roads or airports, where they may need to sleep during the day and want to keep their sleeping habits private.

They’re also good for letting in natural light but blocking out light from other sources, such as streetlights or office lights.

Energy Efficiency

Both the blackout and soundproof curtains are energy efficient. They help keep your home cooler in the summer and warmer in the winter, which saves you money on your heating and cooling bills. 


Blackout curtains are installed on the window frame and can be made from a variety of materials, including thermal lined fabric and blackout lining. They are typically hung on a rail above the window and attached to the sides of the window frame with Velcro. 

The fabric is pulled back on itself through these rollers, creating pleats that help to block light from coming in through the windows.

Soundproof curtains can be installed directly to the wall, ceiling or windows and are usually made from thick cotton fabrics. They are usually lined with foam or a sound-absorbing material like felt, which helps to block out sound by absorbing it. 

Soundproof curtains need to be installed in pairs because they absorb sounds equally well in both directions. This helps seal off any gaps between walls and windows so that unwanted noise can’t get through.

Overall Quality

There is a lot of overlap in the overall quality of blackout and soundproof curtains. Both types of curtains are made from similar materials and are designed to block out light, sound, and air.

Blackout curtains are generally heavier than soundproof curtains. They have a higher thread count than soundproof curtains and are often thicker as well. This is because blackout curtains need to be thick enough to block out all light when they’re closed completely (which means no light can get through). 

Soundproof curtains don’t need to be as thick or heavy as blackout curtains because they don’t need to block as much light out.

Soundproof curtains are more expensive than blackout curtains. This is because soundproofing involves creating an airtight seal around the windows in order to reduce noise from outside, and that requires more time and effort on the part of manufacturers compared with making regular old darkening shades.

Best Fabrics for Blackout Curtains (for Soundproofing)

Best Fabrics for Blackout Curtains (for Soundproofing)

Blackout curtains are made from a variety of materials, but there are a few that stand out when it comes to their ability to block sound from getting in or out of your home. Here’s what we recommend:

Heavyweight Polyester

If you want to make sure your blackout curtains are as soundproof as possible, there’s no better choice than heavyweight polyester.

This fabric is known for being extremely durable and long-lasting, so it will last through many years of use. And it’s also one of the most effective fabrics for blocking out noise because of how thick it is. In fact, when it comes to soundproofing, there’s no better option than polyester.

Polyester is also a great choice if you’re looking for something that will add a touch of style to your room. It comes in a variety of colors and patterns, so you can find one that suits your needs perfectly.

Another plus? It’s machine washable. That means you can use your blackout curtains for years without having to worry about them getting dirty or stained, you just toss them in the wash when they need cleaning.

Heavy Microfiber

Heavy microfiber is a great option for blackout curtains because it’s light, durable and extremely soft to the touch. Heavy microfiber also does a good job at blocking out light and sound.

Heavy microfiber curtains are perfect for soundproofing because they are thick and have a dense weave. They will block out all kinds of noise, including traffic, people talking, and other noises that can come through your windows.

Heavy microfiber is soft, durable, and easy to clean. It’s also available in a wide range of colors and patterns, so you can choose one that matches your room decor perfectly.

Synthetic Fiber Blends

Synthetic fiber blends are a great option for blackouts curtains. Some of the most popular 

synthetic fibers used in fabric include polyester, nylon, and polypropylene.

The pros of using synthetic fibers are that they are easy to clean and care for, they don’t fade or shrink as much as natural fibers do, they’re hypoallergenic (so they’re good if you’re sensitive to dust mites), and they don’t attract pet hair as much as some other fabrics might.

The cons of using synthetic fibers are that they can feel stiffer than natural ones when you first get them, they tend to crease easily, and they can feel hot if you’re trying to keep heat out of your room (but this is a matter of personal preference).

If soundproofing is an issue for you, consider using a fabric made from a blend of synthetic fibers mixed with wool or cotton. This will help absorb sound while still keeping the blackout effect that you want from the curtains.


Silk is not only incredibly soft and luxurious, but it also blocks out light better than any other fabric on the market. This means that you can get a great soundproofing effect without having to sacrifice your comfort or style.

Silk will also help to keep your home cool in the summer and warm in the winter, which means that you won’t have to worry about whether or not your blackout curtains will be too hot or cold for you.

Silk has a lot of benefits: it’s soft, breathable, and adds texture to your room. It’s also easy to clean and maintain. You can even use liquid or powdered detergent on silk curtains without harming them.


Wool is a great fabric for blackout curtains because it’s warm and soft, but it’s also highly insulating and helps to reduce noise. Wool is an excellent sound absorber, which means it will absorb the sounds coming from outside your home and keep them from reaching inside.

Wool has a high density and its fibers are very small. It doesn’t allow much light to pass through it, so your room stays dark even when the sun is shining brightly outside.

You can find wool in many different weights, from lightweight woolen throws to heavier winter coats. The heavier the weight of the fabric, the warmer it will be in your home. If you live in a cold climate where there are several feet of snow on the ground all year long, then heavy-duty wool fabric would be best suited for your blackout curtains.

How to Make your Windows Soundproof (Easy and Effective Methods)

How to Make your Windows Soundproof (Easy and Effective Methods)

Here are a few ways besides curtains to help you reduce sounds coming from the windows:

Weatherstrip Windows

If you have old windows or have gaps around your window, weatherstripping may be worth your while. This is the material that goes around the edge of a window frame to seal out cold air and dust. 

Weatherstripping can help prevent drafts, which can save you money on your energy bill. You can buy different kinds of weatherstripping at hardware stores or home improvement stores.

To install it, first clean any dirt off the window frame with warm water and soap. Dry it thoroughly with a towel before applying the weatherstripping tape. If there is any paint on the window frame, you should remove it before applying the tape.

Seal the Gaps using Caulk

Sealing the gaps between windows and their frames is a great way to make your windows soundproof.

Sealing the gaps is a fairly straightforward process, but it does require some patience and a steady hand. You can find caulking at most hardware stores, and it comes in many different colors and textures.

First, clean off any old caulking from the window frame with a damp cloth or sponge. If you have any gaps between the window frame and its casing or trim, now is the time to fill them in with wood filler or spackle. Let that dry completely before proceeding.

Install Double Pane Windows

You can make your windows soundproof by installing double pane windows. This is an expensive option, but they are worth it if you want to completely block out the sounds from outside.

They reduce the amount of noise that gets in and out of your home by using two sheets of glass separated by a small space. This space is filled with argon gas or krypton gas, which is a nonreactive gas that doesn’t let sound waves pass through. This means that you won’t hear as much outside noise inside your home.

You can install double pane windows yourself if you’re good with tools and have some experience working with glass. If not, it would be best to hire someone who knows what they’re doing to install them for you (though this may cost more).

Use Window Inserts

If you’re looking to make your windows soundproof, one of the best ways to do so is by using window inserts. These are special pieces of plastic or glass that can be inserted into your windows to stop outside noise from coming in. They’re easy to install, and they add a layer of insulation between the outside world and your home.

First, you’ll need to measure the size of your window. Measurements should be taken from the inside of the frame, this will ensure that you get an accurate measurement. Once you have your measurements, head out to your local hardware store and purchase some window inserts.


Blackout curtains are designed to reduce noise from outside, but they won’t completely block it out. They’re made from thick, heavy fabric that keeps light from coming in and also muffles sound. If you want complete silence, you’ll need something like double-pane windows or soundproof curtains.

There are numerous types of black-out curtains and some of them block out more sound than others. 

It is important that you take the time to look at the properties of your home (where the windows are placed and how sound travels through your property) before deciding whether a blackout curtain will be effective for you.

Some kinds of fabrics are more effective at blocking noise than others. If you need your curtains to do double-duty as soundproofing for the outside, then opt for wool or microfiber fabric, which tends to be better than polyester when it comes to keeping outside noise (and light) from coming in.

Frequently Asked Questions (Are Blackout Curtains Soundproof)

Do blackout curtains keep sound out?

Yes, blackout curtains can help block out sound. The curtains are made of a heavy, thick material that blocks out light, which means it also blocks out noise. The heavier the material, the better job the curtains will do at blocking sound.

What kind of curtains are soundproof?

The best kind of curtains to soundproof a room are heavy and thick. This can be achieved by using velvet or silk. These types of curtains are able to absorb the sound that comes from outside, keeping it from entering your home.

The reason these work so well is that they provide a lot of insulation, which means they will absorb some of the sound coming through the window and keep it from reaching your ears. 

Are curtains good for soundproofing?

Yes, curtains can help soundproof a room. Curtains will block out some sounds that pass through the wall and floor, but they won’t be able to block out all of them. If you want to completely soundproof your room, you’ll need to invest in double pane windows.

Curtains are a great way to soundproof your home. They block sound and also help to reduce noise from outside. You may need more than just curtains, though. In addition to the curtains, you might want to consider adding insulation or double-paned windows.

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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.