What is it? Impact Insulation Class is an acoustical rating used to quantify impact sound absorption.
What is it used for? 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. So IIC ratings are assigned to floor underlayments not only based on the product’s material, but the floor assembly on which it is installed.
What underlayments carry have IIC ratings? Acoustical floor underlayments. Acoustical Solutions offers a variety of acoustical floor underlayments including Acousti-Mat® and Iso-Step.
Acousti-Mat® Floor Underlayment is a material made up of extruded nylon filaments which form a 3-dimensional core that has a non-woven fabric heat bonded to its upper surface.
The durable, yet pliable, construction of Acousti-Mat® sound control matting lowers both structural and airborne sound transmission by its ability to convert and store vibrational energy. Acousti-Mat® Floor Underlayment has an impressive IIC rating for all assemblies, but carries no STC rating as a stand-alone material. Iso-Step Floor Underlayment is an environmentally friendly rubber-based product made from recycled tires. It offers credible sound reduction for structure borne noise, with exceptional IIC ratings for all assemblies and does help increase the STC rating when used in a soundproof flooring assembly.