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STC Rating Estimator for Wall Assemblies

Estimate the Sound Transmission Class (STC) of a stud wall: wood or metal studs, staggered or double studs, insulation, gypsum layers and resilient channel.

How to use

  1. Choose the framing: wood 2×4 or 2×6, 25 gauge metal studs, staggered studs or double studs.
  2. Set one or two layers of 5/8" gypsum board on each side, and whether the cavity is insulated.
  3. Turn on resilient channel if one side is mounted on it. It has no added effect on staggered or double studs, which are already decoupled.
  4. Read the estimated STC range against the IBC minimum of STC 50 between dwelling units.
  5. This is an estimate from typical published values, not a tested rating. Use a tested assembly for code compliance.

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