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100mm DFM Acoustic Insulation

Price:  Starting at: £6.72

Dense Fibre Matting (DFM for short) is an essential product in any soundproofing project aiming at reducing levels of airborne noise.

DFM is used between floor and ceiling joists, and inside stud walls to increase the sound insulation between rooms. DFM acoustic insulation slabs block and absorb sound that would normally transfer between rooms. DFM slabs are manufactured to a higher density than many other forms of insulation that are normally used for thermal insulation, DFM does offer thermal and acoustic insulation.

Acoustic slabs are an essential part of any soundproofing project that you are undertaking that involve blocking airborne sound between rooms. Any party wall or stud wall would achieve much higher levels of sound insulation when using DFM acoustic slabs. If you are soundproofing a ceiling the slabs will friction fit between ceiling joists to block and absorb sound that would normally reverberate inside the cavity between the floor and ceiling.

If you are considering wall soundproofing DFM can be used to help block flanking noise when inserted between floor/ceiling joists above or below the wall being treated. 

DFM is available in a range of thicknesses 25mm, 50mm, 75mm and 100mm to suit any application for stud walls and ceiling joists. We would recommend the 100mm DFM for floor and ceiling applications as this meets Part E requirements. Walls can be insulated using any thickness that will go inside the depth of stud being used.

The DFM range comes with a choice of density, this is how compacted the slab is (not the weight). They range in density is kg/m3 from 45, 60, 80 100 & 140. The easiest way to understand which one to choose would be to assume the higher the density the better the overall level of soundproofing. We would recommend the 80kg/m3 as this offers the optimum level of sound insulation for the cost. 

Fitting DFM is simple; it can be cut with a hand saw or sharp knife. The products will friction fit if cut slightly larger than the opening.

DFM will also increase the thermal insulation of a room and has a non-combustible fire rating.

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.

Product Information

  • Dimensions 1200mm x 600mm
  • Thickness mm 25 50 75 100
  • Weight various 2-4kg per slab
  • Density kg/m³ 45 60 80 100 140

Small quantities are delivered as small items; this item is normally delivered on a pallet.

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