The Sound Advice Blog

How to Soundproof a Window



PrivacyShield® Window Seal Kit

Quite often we get calls to soundproof a window. Our customers have issues with sound from traffic & highway noise, neighbors, barking dogs, HVAC and other machinery, etc. coming into a residential or commercial space. Typically, the compliant is that sound is coming in through the existing windows. Soundproofing a window helps provide speech privacy and reduce distracting noise.

So, how do I soundproof my window? Below we will outline some ways to address blocking sound from entering an interior window.

OPTION 1: Replace Existing Windows with Soundproof Windows

Soundproof windows will typically have multiple layers of glass with air gaps in between. Milgard and other suppliers carry soundproof lines that can replace your existing windows.

PROS: Effective, aesthetically pleasing solution.

CONS: Expensive and may require a contractor to install.

Option 2: Soundproof a Window with a Window Seal Kit

The PrivacyShield® Window Seal Kit easily installs over the existing windows. These magnetically mount to the surface of the window trim or install in between the jambs of the window. The kit provides both acoustic and thermal insulation and is removable for access for cleaning or maintenance. The PrivacyShield® Window Seal Kit is compatible with a wide range of window styles.

PROS: Inexpensive add on. Easy to remove and you get to keep your existing window style. Reduces noise and lowers heating & cooling costs.

CONS: Not having one installed on your window yet!

Option 3: Soundproof a Window with Clear Sound Barrier

A custom sized window panel can be created using our AudioSeal® Clear Sound Barrier. The barrier can be manufactured in a size up to 48″ wide. The clear vinyl panel is then applied using velcro to the perimeter frame of the window. The clear barrier panel will need to extend past the visible glass and adhere to the perimeter molding to create a good seal and air gap. This option may not work with all styles of windows. See illustrations to the right.

AudioSeal® Clear Barrier Window Panel

PROS: Inexpensive and removable. Allows light to pass through.

CONS: May not achieve a specific desired look.

Option 4: Soundproof a Window with a Barrier Blanket

The ABSC25 Sound Combination Blankets typically manufactured with grommets for hanging and velcro on vertical edges. this allows blankest to hang temporarily over an window or opening. These can be sized  up to 48″ inches by 25′ (some limitations may apply). It may take multiple blankets to cover larger windows. Blankets may be made to overlap with mating velcro, allowing for a good sound seal and to hold the blanket in place. The blanket panel will need to extend past the visible glass or window frame and adhere to the perimeter molding to create to seal an potential air gaps.

AudioSeal® Combination Blanket ABSC-25 Window Panel

AudioSeal® Combination Blanket ABSC-25 Window Panel

PROS: Removable / temporary solution. Blocks & absorbs sound.

CONS: Loss of light / vision and use of the window.

Other Articles on Soundproofing:

Soundproofing a Wall

Soundproofing a Floor

Kevin McIver | Acoustical Solutions

Kevin McIver

Acoustical Sales Consultant

800.782.5742 Ext. 119

Direct: 804.349.0049

Message Kevin

Wondering if the blanket illustrated here could help reduce the noise filtering into my master bedroom from cars passing outside the street. My window dimension is 70″ by 46″ and a single pane. Soundproof foam is an option but wanted to know how that compares with the blanket you recommend. The thickness of the space to possibly fit the foam us 4″.

Your response is well appreciated.


Yes, the ABSC-25 blanket is a sound blocking and absorbing material. This will block the sounds coming in from your window, whereas the foam you mentioned will help with echoes in your room, but is too lightweight to block the sounds coming in from outside. You need heavy dense materials to block sound. You’ll want the blanket to attach to the frame surrounding the window and be as airtight as possible for the best results.

Comments are closed.