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Do Acoustic Panels Help With Outside Noise?

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No, acoustic panels don't help with outside noise. Traffic noise comes in through windows, vents and gaps, and a 2 in. fiberglass panel adds only 0.5 lb/sq ft (Owens Corning 703 (opens in a new tab)) to a wall that already does better than its windows. In Federal Highway Administration ratings, a wood-frame wall stops 31 dB of highway noise, while a closed single-pane window stops only 24 dB.

Bars drawn to scale from FHWA ratings: a wood stud wall with plaster and siding stops 31 dB of highway noise, a closed single-pane window 24 dB, a wall air conditioner with vents open 21 dB, and a fully open window 4 dB; a storm window adds 5 dB
The wall beats everything that's set into it. Source: FHWA, Insulation of Buildings Against Highway Noise (opens in a new tab).

Pressing an acoustic panel over the glass won't help either. A 1/8 in. pane already weighs 1.6 lb/sq ft (New York State OGS (opens in a new tab)), more than three times what a fiberglass panel does. Your windows are the weak spot, so work on the openings instead, in this order:

  1. Seal leaks around windows and doors. That's worth up to 4 dB in FHWA's tables.
  2. Add a storm window or insert: 5 dB over a single pane.
  3. Fit a sealed window plug in the bedroom you sleep in.
  4. Upgrade the glass: double-pane windows rate 30 to 44 dB, depending on the glass and the airspace.

One caveat beats everything else: FHWA rates a fully open window at 4 dB, so none of this does anything while the window's open. Soundproof window panels covers inserts and plugs, and the soundproof panels guide shows which panel types are real barriers. If it's the neighbors you're hearing, see do soundproof panels work and the soundproof panels FAQ.

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