IIC Rating Calculator

Estimate the Impact Insulation Class (IIC) rating of a floor-ceiling assembly based on floor type, underlayment, finish, and ceiling treatment.

Floor structure type

Slab/subfloor thickness (in)

Underlayment type

Underlayment thickness (in)

Floor finish

Ceiling below

Tab to move between fields

Estimated IIC rating

Base IIC (bare structure)32

Underlayment improvement (pts)0

Floor finish improvement (pts)0

Ceiling improvement (pts)0

Meets IBC code (1=yes, 0=no)0

Points below code18

Quality rating (0-4)0

How to Use This Calculator

Enter Floor structure type, Slab/subfloor thickness (in), and Underlayment type.
Set Underlayment thickness (in), Floor finish, and Ceiling below.
Review the Estimated IIC rating result.
Use Base IIC (bare structure) and Underlayment improvement (pts) to inform your decision.

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