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Acoustic Insulation

Acoustic Insulation

Acoustic Insulation

Noisestop Systems provide acoustic insulation slabs to improve sound insulation in your home. Use DFM acoustic insulation to soundproof walls and increase sound insulation between floors and ceilings. Airborne sounds are greatly reduced when you use soundproofing insulation to soundproof ceilings. You can soundproof walls with DFM acoustic insulation to improve the sound insulation for walls when you incorporate acoustic slabs.

Soundproofing insulation will increase the mass and density of a room. Infill between stud walls and floor joists to increase the sound insulation between rooms. Acoustic insulation will reduce airborne sound transfer between rooms.

When choosing which soundproofing insulation to use the two main factors to consider are thickness and density. Ensure you have enough depth in the stud frame to incorporate the insulation, DFM acoustic insulation should not be compressed between plasterboard’s it could cause cracking along the joints. When it comes to the density you use we often advise that mid range density is sufficient for most applications. The soundproofing returns diminish the higher up the density you go. if you compare a 140kg/m³ slab to an 80kg/m³ slab the performance would not be twice as high, but the cost would be.

  • Sound insulation for walls
  • Ceiling sound insulation
  • Floor sound insulation

DFM acoustic insulation is available in the following thicknesses and densities. The 25mm slabs are only available in the 100kg/m³ density. The 50mm, 75mm and 100mm are available in the full density range of 45kg/m³ up to 140kg.m³.

  • 25mm – 100kg/m³
  • 50mm – 45, 60, 80, 100, 140kg/m³
  • 75mm – 45, 60, 80, 100, 140kg/m³
  • 100mm – 45, 60, 80, 100, 140kg/m³

Soundproof walls increase the sound insulation between rooms

Acoustic insulation is used to soundproof walls for high levels of soundproofing. Incorporate inside stud walls and acoustic false walls for party wall soundproofing. Combining DFM with acoustic panels offers the highest levels of sound insulation for walls. We supply complete wall soundproofing kits that combine the best combinations of products to soundproof a wall.

Wall soundproofing solutions that use DFM acoustic insulation.

Wall System 1 | Wall System 2 | Stud Wall Kits 50mm | Stud Wall Kits 75mm | Stud Wall Kits 100mm

Acoustic insulation to soundproof between floors

Use soundproof insulation to increase the acoustic performance of timber floors. Inserting DFM acoustic insulation between floor joists will increase the airborne sound insulation between floors. We recommend the 100mm DFM at 80kg/m³ for most domestic soundproofing applications. Separating floors that require acoustic floor insulation should use a minimum thickness of 100mm/45kg/m³. When you are soundproofing between floors and ceilings in your home use the 100mm DFM.

DFM has a non combustible Class O fire rating which will help separating floors and walls comply with Building Regulations.


DFM acoustic insulation slabs, available in a range of densities from 45 to 140kg/m3. The standard product is supplied unfaced.


DFM Slabs are used for a wide range of thermal and acoustic insulation applications in buildings, building services and industry.


DFM Slabs are made from non-combustible inorganic rock wool, defined as mineral wool in BS 3533: 1981 and are manufactured to a Quality Assurance system which complies with BS EN ISO 9001:2000.


DFM Slabs are odourless, non-hygroscopic, rot proof, do not sustain vermin and will not encourage the growth of fungi, mould or bacteria.


DFM Slabs are free from CFCs, HCFCs and any other material with ozone depletion potential in their manufacture and content and represent no known threat to the environment.

Thermal Performance

The thermal conductivity of DFM Slabs varies with density from 0.035 to 0.037 W/mK – see table below.

Fire Performance

DFM Slabs are classified as non-combustible to BS 476: Part 4: 1970 (1984) and Euroclass A1, Class 1 Surface Spread of Flame to BS 476: Part 7 1997 and Class ‘O’ to the Building Regulations.

DFM 45kg/m³
Thickness mmThermal conductivityThermal resistenceSlab size mm
500.0351.401200 x 600
750.0352.101200 x 600
1000.0351.101200 x 600
DFM 60kg/m³
Thickness mmThermal conductitvityThermal resistenceSlab size mm
500.0351.401200 x 600
750.0352.101200 x 600
1000.0352.851200 x 600
DFM 80kg/m³
Thicness mmTheraml conductivityThermal resistenceSlab size mm
500.0351.401200 x 600
750.0352.101200 x 600
1000.0352.851200 x 600
Thickness mmThermal conductivityThermal resistenceSlab size mm
250.0350.701200 x 600
500.0351.401200 x 600
750.0352.101200 x 600
1000.0352.851200 x 600
Thicness mmThermal conductivityThermal resistenceSlab size mm
500.0351.401200 x 600
750.0352.101200 x 600
1000.0352.851200 x 600


For enquiries please call 01423 339163, or send us a message via our contacts page. FREE Nationwide delivery on orders over £750ex.VAT

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