Soundproof a Room Basics

You can soundproof a room very well at a reasonable cost if you follow some basic, tried and true methodology.


Soundproofing Element - Decoupling

1. Decouple The Framing

This can be done with staggered stud or double stud walls. To decouple the ceiling, consider clips&channel. Resilient Channel (RC-1) attempts to decouple, however, there is no industry standard or specification for its construction, so we would be concerned about using it.

  • Double Stud Wall with Green GlueDouble Stud Wall
    with Green Glue
  • green-glue-wall-types-soundproofing-clipsSoundproofing Clips
    with Green Glue
  • green-glue-wall-types-staggered-studStaggered Stud wall
    with Green Glue
  • green-glue-wall-types-resilient-channelResilient Channel
    with Green Glue

effectiveness-scale


absorption

2. Install Absorption in the Cavities

This means standard fiberglass R13 in the walls, and R19 in the ceiling. Know that there is no data that supports that any other insulation (including the “acoustic” labeled, and recycled cotton) works better. Also, foam (open or closed cell) is superior for thermal but distinctly worse for acoustic. Use the cheapest fiberglass you can find.

Save your self some money and install Fiberglass Insulation.


mass

3. Add Mass

Nothing better than standard 5/8” Type X. Great mass at 70+ pounds a board, and cheap at $7 a sheet. Use two layers. Only mud and tape the final layer.

  • Standard Wall Assembly - STC 40
  • Two Layers of Drywall Soundproofing Wall - STC 42
  • Four Layers of Drywall Wall Assembly - 44 STC

damping

4. Add Damping

Consider damping these drywall panels with one of several field-applied damping compounds. Some work better than others, and independent lab data shows you get what you pay for here.


Here’s an additional soundproof a room article that deals with these Elements of Room Construction.

After that, you should turn your attention to the ventilation, lights, and doors. All of these are flanking paths for sound to get out of the formidable room you just built. They can be dealt with fairly easily, but you will want to incorporate this in your design. For more detail on Flanking, you can review our article: Dealing with Flanking Noise

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