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Concrete floating slabs are used where mass is needed to boost low frequency noise reduction. This creates an airspace between a poured non-structural slab and the subfloor below. Selection of the appropriate isolation material is based on the application. Both formwork systems and "jack-up" systems using neoprene or fiberglass pads produce relatively high STC and IIC ratings when compared to thinner continuous underlayment assemblies. Where heavy impacts from sport and fitness activity are a concern, a spring lift slab floor system is often utilized.
High performance floated wood and composite floor systems are used when the subfloor will not support the weight of a concrete slab, meet floor elevations or when concrete is unnecessary. While these systems do not benefit from the added mass of concrete, they are effectively employed in a wide range of applications.
Low-profile underlayments are most typically used in multi-family residential applications. Hard finish floors like wood and tile create higher levels of impact generated noise in spaces below. Occupant complaint is not uncommon and class action litigation has increased awareness among developers. Effective sound control underlayments exceed building code requirements for IIC (Impact Insulation Class) and STC (Sound Transmission Class) and minimize occupant complaints.
Sound Isolation Floor Systems encompass a wide range of resilient composite constructions designed for varying acoustical criteria. An isolated floor, commonly called a "floating" floor, is used to minimize airborne and impact-generated sound transmission through the floor/ceiling assembly. Depending on application, the floating floor may be supported on resilient pads, a continuous resilient underlayment, or spring mounts. The perimeter of the floor is isolated with a resilient isolation board to prevent sound flanking.
