What is IIC? (Impact Insulation Class)
Impact Insulation Class is an acoustical rating used to quantify impact sound absorption.
This rating system is used for floor/ceiling arrangements. Some arrangements include floor underlayments, which go under carpet, vinyl, or hardwood in multi-level buildings to absorb impact noise such as footfall, keeping the noise and vibration from transferring to the ceiling below. Assemblies with these acoustical underlayments have a higher IIC rating because they block more impact sound.
Iso-Step® is used to prevent impact and structural borne sound from passing through construction assemblies. The IIC (Impact Insulation Class) ratings directly relate to the measure of impact reduction. STC (Sound Transmission Class) ratings are used to quantify how much airborne sound is reduced by a material or construction assembly. Iso-Step® is not intended to reduce airborne sound. However, the overall construction assembly, that includes Iso-Step®, would have an improved STC value. It is the complete assembly that provides a reduction in the airborne sound. The overall assembly would be tested to determine a STC value.
At no point should nails penetrate the Iso-Step® floor underlayment layer and make contact with the sub-floor. This would ‘short-circuit’ the flooring assembly and allow sound and vibration to transfer to the underlying construction assembly.
The nail-down flooring should be nailed to an additional layer sub-floor layer. The sub-floor layer should be thick enough so that nails do not protrude. The Iso-Step® flooring underlayment would reside under this layer, free from any penetrating nails.
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Enkasonic® Floor Underlayment
Our Iso-Step® Floor Underlayment is engineered to provide superior impact sound insulation and better performance over other sound control materials. It may be installed over a wood or concrete sub floor and under a wide range of flooring finishes. Installing Iso-Step® underneath the entire flooring assembly short circuits impact noise to combat footfall and structure borne sound and vibration.
Impact noise is a structure borne sound created when two objects collide. This impact energy creates vibrations that resonate through the materials in the structure. It also creates airborne sound. This is often realized in the real world as a ‘neighbor noise’ generated from someone walking on the floor above or other activities. The Iso-Step® acoustic floor underlayment should be placed underneath the finished flooring and cover the whole floor. This provides an isolation layer to help prevent structural sound from passing through the completed assembly.
Manufactured in the USA using recycled material, this rubber floor underlayment has been rigorously field tested with proven results. It can be installed under most types of grouted, glued, and floating floors, including ceramic tile, stone, marble, brick, pavers, hardwood, engineered wood, laminate, parquet, luxury vinyl tile and carpet.
Our Iso-Step® Floor Underlayment is available in thicknesses of 2 mm, 5 mm, 10 mm and 12 mm. With a Delta IIC from 16 to 25, we offer a rubber floor underlayment well-suited to meet any job requirement.
|Acoustic Test Results of Common Assemblies|
|2 mm||Wood flooring, 1 layer 2 mm, 8″ reinforced concrete slab, suspend ceiling||72||72|
|2 mm||LVT (luxury vinyl tile) flooring, 1″ gypsum concrete, 1 layer 2 mm, wood truss, resilient channels, suspended ceiling||63||50|
|5 mm||Laminate flooring, 1 layer of 5 mm, 7″ reinforced concrete slab, no ceiling||55||58|
|5 mm||Ceramic tile, cement board, 1 layer 5 mm, wood truss, resilient channels, suspended ceiling||64||52|
|10 mm||Porcelain tile, 1 layer 10 mm, 8″ reinforced concrete slab, no suspended ceiling||57||53|
|12 mm||Porcelain tile, 1 layer of 12 mm, 8″ reinforced concrete slab, no suspended ceiling||57||53|