The principle of supporting two separate masses to significantly improve the standard acoustic mass law performance is well understood. The term ‘Floating Floor’ is a relative new expression that has gained favour in more recent years but the method of supporting a floor structure on resilient bearings off a structural slab has been applied and developed over a number of years. The development of structural materials has enabled architects and engineers to make more and more use of lightweight structures in modern building designs. This has highlighted the need to consider carefully the noise, shock and vibration transmission loss characteristics of these structures. In particular, for high rise buildings, the proximity of noisy/high activity areas to quiet/critical areas significantly increase the potential for use of acoustic and vibration isolation materials, including floating floors. For example, it might be necessary to isolate a plantroom from office accommodation below, reduce external noise such as low flying aircraft penetrating the roof of a building or reducing the transmission of footfall impact noise from one apartment to another below. SRS floating floor systems have been used successfully in applications such as Plantrooms, Offices, Prestigious Apartment Blocks, TV, Radio and Recording Studios, Cinemas, Concert Halls and Audiometry rooms.
Floating Floor Systems
• Laminated steel and natural rubber elastomer bearings are located beneath rigid steel channels positioned to suit the load distribution arrangement.
• Natural rubber bearings are true elastomers and are applied within their linear stiffness range to achieve the required design performance, low creep and resultant design life.
• Standard design can provide natural frequencies down to 6Hz.
• Profile permanent steel shuttering keyed to concrete for greater rigidity of floating floor slab.
• All steel is galvanised and elastomer bearings are unaffected by water, vermin or other pests.
• Floor thickness from 100–300mm with imposed loads of up to 20 kN/m2.
• Sound transmission loss is dependent upon concrete thickness and air space.
• Under the design condition, the life of a SRS floating floor system will be at least the life of the building.
Floating floors can be provided externally on the roof as well as within the building. The form of construction is similar for both instances although additional treatment is required to fully weatherproof the external floating floor.