Common questions

What is a good IIC rating?

What is a good IIC rating?

An IIC rating of 50 and above is most common in building code and HOA requirements. The GenieClips® RST or HushFrame Raftare most commonly used on the ceiling to improve the IIC rating, while GenieMat® RST rubber underlayment or Acoustic Sleepers are most commonly used on the floor to improve the IIC rating.

Is STC 50 good?

STC Examples

STC Track Application
40 Loud speech now only a murmur
45 Loud speech not heard, music systems/heavy traffic noise still a potential problem
50 Very loud sounds such as musical instruments or a stereo can be faintly heard
60+ Excellent soundproofing

Is a higher IIC rating better?

Example: A high IIC rating, indicates good sound insulation properties. Decibels (dB) are logarithmic, so a change of 10 doubles the sound insulation properties. A 60 IIC rating is twice as good as a 50 IIC rating.

What is an STC rating for flooring?

The Sound Transmission Class (STC) is the rating of airborne sound transmission. The STC of a floor/ceiling (or wall) structure is a measure of the decibel difference between the airborne sound energy striking one side of the structure and the sound energy radiated into a receiving room on the other side.

What is the highest IIC rating?

The highest rating is IIC rating 65, which includes cork flooring and carpet. NRC Rating or Noise Reduction Coefficient: This is measured on a scale between 0 and 1. A rating of 0 means that sound energy perfectly reflects off of a surface.

Is FIIC same as IIC?

IIC stands for “Impact Insulation Class”, the degree of soundproofing of the impact noise of a floor/ceiling assembly in a laboratory. The higher the IIC, the better the acoustic insulation. FIIC stands for “Field Impact Insulation Class”.

How can I increase my IIC rating?

To increase the IIC rating, an upgrade to the sound mat and/or the resilient ceiling system must be made. Traditional sound control mats with entangled mesh enhance IIC performance through the mesh being attached to fabric, which is loose-laid over the subfloor and then encapsulated with a gypsum concrete topping.

Which underlay is best for soundproofing?

The best material for soundproof underlay is foam or sponge. These materials are great at blocking out sound and they also provide exceptional comfort, and we stock some fantastic options for all preferences and budgets.

What is the highest IIC rating for underlayment?

The QuietWalk underlayment provides very high ratings such as IIC of 71 and STC 66 as of mid 2018. Disclaimer: All Ratings Are Not Equal As with any underlayment sound testing number that a company gives you, each subfloor or floor assembly in your home.

What’s the difference between a FIIC and a IIC rating?

(FIIC and FSTC) ASTM E1007 and E989 are Field tests performed by setting up test equipment in a building. The International Building Code suggests a rating of 50 or more for IIC and STC, but allows 45 or more for FIIC or FIIC field tests.

What kind of test is a FIIC test?

Another interesting test to characterize the soundproofing of a building is the FIIC test (Field Impact Insulation Class). Like the FSTC, it represents measurements taken directly in the building in question and not laboratory data. Otherwise, it would be the IIC (Impact Insulation class) test.

What does FIIC stand for in flooring category?

FIIC stands for “Field Impact Insulation Class”. This is a unit of measurement that determines the degree of soundproofing of the impact noise of a floor/ceiling assembly on site rather than in a laboratory. The higher the FIIC, the better the acoustic insulation.

What is the difference between AIIC and FIIC?

A FIIC test is carried out on site, in real buildings. It can be argued that this rating is more representative of reality than a IIC laboratory test. AIIC stands for “Apparent Impact Insulation Class,” which is the insulation index of the apparent impact noise of a floor/ceiling assembly on site.

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