wearing shoes. The impact of shoes hitting the floor causes sound transmittance through the surface.
There are several ways impact sound can be reduced from smart design. These include: laying a soft floor finish such as carpet, applying soundproofing compound between two fixed layers, using sound absorbing underlay such as ThermoSphere’s acoustic insulation board or matting or installing raised floors in addition to suspended ceilings.
IMPACT SOUND AND ELECTRIC
UNDERFLOOR HEATING Hard floors which don’t include isolation material between the covering and floorboards exacerbate impact sound transmittance. For impact sound such as footsteps, an acceptable level of 62dB is set for floors in newbuilds and 64dB for conversions as set out in Part E (Resistance to Sound) of the Building Regulations.
ThermoSphere Foil provides a unique combination of heating, acoustic and cushioning layers. Multiple layers are included to achieve sound reduction, optimise efficiency of the system and minimise height build-up. The 1.2mm cushioning overlay (slip layer) protects the heating cables from any abrasion caused by a floating floor finish and a 5mm cushioning underlay allows the heating cable to snuggly lay on a protected layer which further reduces the chance of abrasion and reduces the height build-up by 1.5mm. This combination provides a 21dB reduction in impact sound. ThermoSphere Foil is also the only system of its type to include a continuous earth braid and accessible cable loops for total peace of mind.
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PREMIER HOUSE – ACOUSTIC IMPROVEMENT SURPASSES
BUILDING REQUIREMENTS Premier House is a 1960s concrete frame office building which was converted into 119 luxury residential apartments. As the development had 13 floors, it was vital that the specified products within the floor build-up had strong acoustic sound reduction properties as well as a minimal height build-up.
The client was considering a wet underfloor heating system but was having difficulties in finding one which allowed for minimal height build-up. ThermoSphere Foil was proposed as a low build-up alternative with great acoustic benefits which was helped further by using 15m acoustic insulation board made of 100% natural coconut fibres.
This solution provided a completely dry installation which saved time on site while achieving a minimal height build- up. This meant that the client could maintain perfectly designed room heights no matter the constraints of the structure. Importantly, an independent test conducted on site demonstrated the acoustic improvement surpassed the building requirements stipulated by building control.
UNDERLAY & ACOUSTIC SOLUTIONS | 27
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