How to Soundproof Windows

Lead Image
  • 2-5 hours
  • Beginner
  • 50-120
What You'll Need
Caulk gun
Utility knife
2-inch thick foam
Glue or tape

If you want soundproof windows, the easiest solution is to replace your existing windows with new soundproof windows. But for many people, this option is not affordable.

The windows are not cheap, but any other method to soundproof windows will typically prevent light from entering the space. You can soundproof windows in the basement or attic as well as any other window in the home.

In many cases, a person will soundproof their windows to contain loud music. Whatever your reasons might be, there's no need to spend thousands of dollars on new windows when you can effectively make soundproof windows yourself. The following information will show you how to do just that.

Seal the Existing Windows

This process is known as "plugging" because you are essentially plugging the windows from the inside with caulk to help stop sound from escaping the seams of the window. Take a look at the windows in the space you want to soundproof. Place your hand around the edges and feel for air. These drafty spots are where sound will easily escape. Use the caulk to seal these areas. If you cannot feel any air then you may skip this part because the windows are already properly sealed.

Cut the Soundproof Foam

The foam is the most important part of soundproof windows in this "plugging" method. Use the measuring tape and measure the width and the height of the windows to be soundproofed. Double and triple check your measurements because you want this to be as precise as possible. Once you are certain you are correct; begin cutting the foam. The foam has to be cut to these exact dimensions; any inaccuracy can make the entire project moot. Straight lines, as well as adherence to the measurements, are equally as important. Remember, you are plugging the window so the foam you are cutting has to fit the window snugly.

Install the Soundproof Foam

Place the foam you cut within the window frame. Do not press it against the window. You want an air pocket to remain between the window and the foam. This trapped air acts as another barrier to the sound; preventing it from escaping. This is why the foam had to be cut precisely and fit tightly inside the frame.

Seal the Foam

If the foam is very snug and there are no gaps present, you can skip this step. If you want to further dampen the sound, use the tape to seal the edges of the foam. The foam is now effectively the window and the tape is the new caulk. You most likely will not want to seal a window up permanently so using masking tape to seal the gaps between the foam and the window frame will be a better solution than glue. To remove the foam you would just need to remove the tape and pull the foam out. The caulk you added in Step 1 will only serve to better your heating and cooling efforts.