STC Rating Calculator

Estimate Sound Transmission Class (STC) for wall assemblies based on wall type, drywall layers, insulation, stud spacing, resilient channel, and staggered studs.

Inputs

Wall type (0-3)

Drywall layers per side

Insulation type (0-3)

Stud spacing (inches)

Resilient channel (0=no, 1=yes)

Staggered/double studs (0=no, 1=yes)

Tab to move between fields

Results

Estimated STC

Base STC (wall type only)33

Drywall bonus (pts)0

Insulation bonus (pts)0

Decoupling bonus (pts)0

Assembly grade (0-3)0

Improvement potential (pts)17

Est. fire rating (min)30

How to Use This Calculator

Enter Wall type (0-3), Drywall layers per side, and Insulation type (0-3).
Set Stud spacing (inches), Resilient channel (0=no, 1=yes), and Staggered/double studs (0=no, 1=yes).
Review the Estimated STC result.
Use Base STC (wall type only) and Drywall bonus (pts) to inform your decision.

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