Do Soundproof Panels Work? What They Fix and What They Don't

Soundproof panels work on echo, not on noise coming through your walls: a 2 in. foam or fiberglass panel soaks up most of the mid-range sound that hits it (NRC 0.75 for an Auralex Studiofoam Wedge (opens in a new tab), 1.00 for Owens Corning 703 (opens in a new tab)) but does almost nothing about the sound passing through the wall behind it. So do soundproof panels work for you? Only if the sound that's bugging you is made inside your own room.

Blocking takes weight and an airtight build. A 2 in. fiberglass panel weighs just 0.5 lb/sq ft (3.0 lb/cu ft × 2 ÷ 12). Even a full extra layer of 5/8 in. drywall, at 2.2 lb/sq ft, only took an insulated 2x4 wall from STC 34 to 37 in USG lab tests (opens in a new tab).

Bars drawn to scale: a 2 inch fiberglass acoustic panel weighs 0.5 lb per square foot, mass loaded vinyl 1.0 lb and rates STC 26 alone, one layer of 5/8 inch drywall 2.2 lb and raised an insulated wall from STC 34 to 37 — A drywall layer more than four times heavier than a panel bought just 3 STC points.

Watch out: Those foam and fabric squares sold as "soundproof panels" are absorbers. Only a heavy barrier sealed into the wall blocks noise, like mass loaded vinyl at STC 26 for 1 lb/sq ft (Johns Manville (opens in a new tab)).

Buy panels if your room rings on video calls or sounds boomy over hard floors. Hearing the neighbor's TV? Seal the gaps under the doors and around the outlets first, then add mass and decoupling to the wall. Acoustic panels vs soundproofing helps you figure out which job you've got, and do acoustic panels soundproof a room runs the numbers for a typical wall.

The soundproof panels guide covers every panel type, and there are more answers in the soundproof panels FAQ.

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