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Acoustic Underlay | Acoustic Underlays

Acoustic underlays are widely used to soundproof domestic and commercial floors, acoustic underlays are a popular choice for home owners and developers that want to reduce impact and airborne sound through separating floors.

Soundproofing Underlays

When deciding which flooring solution to choose there are certain factors that need to be taken into account in order to make the right choice for your application. We can provide assistance in helping you choose which product to use email us at info@noisestopsystems.co.uk or call 08451 306269. We can help with enquiries ranging from soundproofing one room up to Part E Building Regulations and everything in between.

What type of sound are you trying to stop impact or airborne?

Reduce airborne noise transmitting through floors with either the NSSF7 or the Barrier Shield, if you trying to soundproof your floor on a tight budget the Barrier Shield will offer comparable airborne sound insulation results as other acoustic underlays on the market, the insulation values for impact noise reduction will be low with this type of material. Reduce the sound of conversation and TV noise with the 5mm Barrier Shield laid over wooden floors.

If you are looking to reduce impact noise as well as airborne noise the NSSF7 or the NSSF7+ acoustic mats would be suitable. The combination of high density rubber and acoustic foams ensure these products will reduce airborne and impact sound through separating floors. The different composition and thickness of these two products makes them suitable for different applications.

Specification NSSF7 NSSF7+
 Thickness mm
 10 15
 Sheet dimensions mm
 1200 x 1200
 1200 x 600
 Weight kg
 Airborne sound reduction
 43  42
Impact sound reduction 62 59
Floor Finishes

You should choose your acoustic underlay to suit your floor finish, hard floor surfaces such as wooden floors will generate more noise issues than carpeted floors, and impact and airborne noise will be increased if you are replacing carpets with wooden floors. This is a common problem with communal living if you want to change to a wooden floor; leases often stipulate you are not allowed to alter floor finishes unless you can ensure the new flooring will not generate noise problems for neighbouring properties. The NSSF7+ has been used to successfully keep the level of impact noise at the required level.

The NSSF7 floor mats are used predominantly below carpeted floors to improve the sound insulation in homes and flats that are trying to reduce the transfer of sound between floors while reducing the build up of the floor.

Part E soundproofing

New build and conversion projects that require sound insulation on the floors to meet the current regulations can choose this type of soundproofing to fit over the existing floors. This type of flooring should be combined with DFM acoustic insulation, soundbreaker bars and acoustic plasterboard to meet the required levels of soundproofing for separating floors. If you have a project that has already failed a sound test and needs a remedial solution to ensure it will comply with the test acoustic underlays are often the quickest and easiest method to use.

Fitting acoustic underlays

Acoustic underlay mats can be laid over any type of existing floor.

  • Ensure the floor is cleared of dust and debris and fill holes with acoustic sealant or any suitable filler
  • If you are using the perimeter strips install these around the edge of the room, carpet gripper rods can be attached to these when necessary. Nail, screw or bond the strips to the floor depending on the construction type
  • Acoustic mats are laid in a broken bond formation with a 5mm expansion gap around the perimeter for expansion, fill this gap with an acoustic sealant once completed
  • Do not leave gaps between the mats, ensure they are butted together to form a complete seal across the floor. Any gaps should be filled with acoustic sealant
  • Cut the mats with a sharp knife or a pair of large scissors for multiple straight line cuts you can also use a circular saw
  • Acoustic matting does not need to be bonded to the sub floor, however if you are installing the matting to comply with Part E you should use a suitable adhesive to bond them to the floor
  • if you are installing laminate, tiles, carpet tiles and lino over this type of flooring you should install a layer of 9mm ply or hardboard over the mats first to avoid damaging the flooring or the joints of the floor finish

For more information on acoustic underlays and other flooring solutions visit Floor Soundproofing.

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