Sound Underlayment for Hard Surface Floors
Kinetics SR Floorboard is a sound-rated floor system used beneath hard surface floor finishes to substantially reduce sound transmission through floor assemblies. It is designed for projects where impact noise, footfall noise, and airborne sound transfer must be managed without adding excessive floor build-up height. Kinetics describes SR Floorboard as offering better airborne noise control than Soundmatt, while being thinner than Ultra Quiet SR.
Thin Acoustic Floorboard Construction
SR Floorboard is supplied as 4 ft x 8 ft x 5/8 inch sheets made from high-density molded glass fibers separated by a rigid honeycomb core. This composite construction provides a practical underlayment layer for acoustic floor assemblies in residential, hospitality, commercial, and mixed-use buildings where reliable noise control and installation efficiency are important.
Compatible Floor Assembly Options
SR Floorboard can be used with several finished floor build-up methods, including wire-reinforced mortar bed or lightweight concrete, gypsum concrete, plywood or OSB, and reinforced cement backer board assemblies. Kinetics installation guidance also includes SRP perimeter interface material and resilient acoustical or elastomeric sealant to help maintain acoustic separation at walls, door frames, floor drains, columns, pipes, conduits, and other penetrations.
Installation and Coordination Requirements
For best performance, the subfloor should be clean, flat, level, strong, rigid, and properly prepared. Kinetics notes that SR Floorboard should not be used to bridge spans or low areas, should not be fastened with nails, screws, or staples, and should be installed without adhesive, overlapping, gaps, or taped seams. Where a waterproof membrane is used, it must be load-bearing.
Acoustic Performance Documentation
Kinetics lists multiple SR Floorboard sound test assemblies, including laboratory and field tests with ceramic tile, gypsum concrete, vinyl finish flooring, wood joists, concrete slabs, and resilient ceiling constructions. Published examples include tested assemblies with STC 59 / IIC 59, STC 60 / IIC 65, FSTC 54 / FIIC 53, and FIIC 54, depending on the complete floor-ceiling construction.