Does foam soundproof?

No. Foam absorbs within the room (reducing reverberation) but provides negligible isolation (approximately 0 STC improvement). Soundproofing requires mass, decoupling, sealed construction.

Do curtains/carpets soundproof?

They provide absorption (treatment) reducing reflections. They do not block transmission. Soundproofing requires construction: mass, decoupling, sealing air gaps.

Treatment, soundproofing, or both?

Reverberant with poor clarity = treatment. Noise from outside / neighbors hear you = soundproofing. Studios and theaters need both for complete acoustic performance.

Minimum perceptible STC improvement?

3 points: barely noticeable. 5: clearly perceptible. 10: sounds like halving loudness. STC 33 to 55 transforms noisy walls into comfortable separation.

Does foam soundproof?

No. Foam absorbs within the room (reducing reverberation) but provides negligible isolation (approximately 0 STC improvement). Soundproofing requires mass, decoupling, sealed construction.

Do curtains/carpets soundproof?

They provide absorption (treatment) reducing reflections. They do not block transmission. Soundproofing requires construction: mass, decoupling, sealing air gaps.

Treatment, soundproofing, or both?

Reverberant with poor clarity = treatment. Noise from outside / neighbors hear you = soundproofing. Studios and theaters need both for complete acoustic performance.

Minimum perceptible STC improvement?

3 points: barely noticeable. 5: clearly perceptible. 10: sounds like halving loudness. STC 33 to 55 transforms noisy walls into comfortable separation.

Acoustic Treatment vs Soundproofing

Treatment controls internal sound via absorbers and diffusers. Soundproofing blocks transmission via mass, decoupling, and sealing. These are fundamentally different disciplines solving opposite problems. Foam does not soundproof.

ISO 3382-1:2009§3.1ISO 354:2003ISO 16283-1:2014§4ASTM E413:2022

Treatment

Absorbers reduce RT60. Diffusers scatter reflections. Bass traps control modes. Goal: optimize internal character.

Soundproofing

Mass + decoupling + sealing. STC/Rw ratings. Foam provides zero isolation. Concrete isolates but needs treatment for good acoustics.

Measuring Treatment

RT60 before/after per ISO 3382. STI improvement for speech. Avoid over-treating below 0.2 s.

Measuring Isolation

DnT per ISO 16283 before/after. 10 dB improvement = perceived halving of transmitted noise.

Need Both?

Studios, theaters, broadcast. Isolation envelope first, then internal treatment. Independent but complementary systems.

Try It Now

Calculate required absorption

Open Tool