Is Foam Good For Soundproofing Windows?

Does foam work as a soundproofing material for windows? The short answer is: no. Plus, you can’t see through it. Even as a temporary measure, it has little or no effect on stopping sound – but it is good at something else. Let’s look at the details so you can avoid wasting your money on foam.

What Makes Soundproofing Material Effective?

One of the fundamental requirements of soundproofing materials is Density, or how much a material weighs. The more dense it is, the more it can absorb and reflect sound. And, conversely, the lighter a material is, the less it can stop sound.

There are many different types of foam, even if you don’t need to see out your window. But foam shouldn’t be on your soundproofing list, because it is very lightweight – the opposite of what you need to stop sound. It doesn’t matter how it is labeled, i.e., Open Cell, Closed Cell, Acoustic, etc., foam, by its nature (lightweight), is not suitable for soundproofing. It is basically air with a bit of glue and coloring. Because it is only a little denser than air, it simply can’t absorb sound.

Video (4:45): What material is the best for soundproofing?

What IS Foam Good For?

People confuse foam panels as soundproofing materials because they are fantastic for sound damping. This is a process used to improve sound quality in a room, such as a recording booth for music or podcasts, so that the resulting audio is clearer and requires less post-processing. The same is true for soundproof curtains. Actual soundproofing does also help with audio quality, but provides a different benefit than sound damping.

What Is The Best Option for Windows?

Laminated glass is well-suited for soundproofing windows. It is very dense, 3.2  pounds per square foot, and clear. Although acrylic plastic is clear, it is only half as dense as laminated glass.

Remember the Density fundamental: The denser/heavier a material is, the more it can absorb and reflect sound. And, conversely, the lighter it is, the less it can stop sound.

If you’re looking for a great soundproofing solution for your windows, fill out or short estimate request form and tell us about your windows. You don’t need to block your windows with foam to block out sound!