SPC luxury vinyl flooring
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Impact Insulation Class (IIC) Testing
Impact Insulation Class (IIC) is a grade generally used to evaluate a floor/ceiling partition’s ability to resist structure-borne impact sound transfer (i.e., walking, shuffling). Standardized field apparent insulation class (AIIC) testing is managed in the field whereby a standard tapping machine is placed on the floor of the source room in four different directions. The resulting sound levels are measured in the room directly. Measurements are also taken to determine the ambient sound and resonance times along the room geometry. The combination of this data is then used to determine the AIIC rating of the test section. The results of the test are rated in terms of the Impact Insulation Class (IIC). IIC values range from as low as 25 for lightweight residential construction with no floor covering to over 65 for commercial construction with carpet. More typical values fall between 35 and 55.
Sound Transmission Class (STC) Testing
Sound Transmission Class (STC) is a laboratory rating commonly used to evaluate a building partition’s ability to stand out from the airborne sound transfer. ASTC ratings match up with the same assembly tested under field conditions. A field test can determine the rating of a partition for consent with building codes by placing a sound source on one side of the demising wall/ceiling/floor under test, and measuring the sound levels in the source room and receiver rooms on both sides of the assembly. Measurements are also taken to determine the ambient sound and resonance in the receiver room, along with the room geometry. The combination of all this data is used to determine the ASTC rating. STC rating of 38-42 is considered good soundproofing for residential. STC rating of 50-65 is professional, commercial soundproofing for recording studios, etc. These terms and definitions are related to Sound Transmission Class and will help provide the full picture of how sound is measured.