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Soundproofing
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STC & IIC Ratings Contact

STC

What can be heard

30

Loud speech can be understood fairly well, normal speech heard but not understood

35

Loud speech audible but not intelligible

40

Onset of "privacy"

45

Loud speech not audible; 90% of statistical population not annoyed

50

Very loud sounds such as musical instruments or a stereo can be faintly heard; 99% of population not annoyed

60+

Superior soundproofing; most sounds inaudible

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Noise Code
Consultation

IIC

What can be heard

43

Footfall clearly audible

50

The least amount of impact sound transmission reduction considered effective

60

Considered a medium level of impact sound transmission reduction

65

Considered a high level of impact sound transmission reduction that would satisfy most occupants

74+

Footfall inaudible

Services

Party Wall Soundproofing

Typical party walls rate STC 30-40. Adding insulation, additional layers of drywall, and damping compounds can net STC ratings in the low to mid 50's. Decoupling can net ratings of STC 60+.

Decoupled Ceiling

Impact sound (footfall) is a common complaint and can be reduced with decoupling measures applied to either the offending floor or the ceiling below. Existing ceilings typically rate IIC 35-45.

Green Glue Damping

Applied between two sheets of drywall, plywood or any commonly used building materials in new construction and remodeling, effectively reducing noise transfer from one room to another.

Isolation Clips

Designed for use with various framing designs and applications. Isolation clips decouple drywall in wall/ceiling assemblies. Decoupling is the most effective way to reduce vibration.

Acoustical Treatment

Surface mounted foam panels designed to minimize airborne sound reflection in offices, conference rooms, and commerical environments. High performance acoustical ceiling tile replacements are also available.

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