DFM Acoustic Insulation Slabs
Price range: £43.00 through £54.00 ex. VAT
Estimated Delivery: 3 - 5 Days
(31st Jan - 2nd Feb)
Dense Fibre Matting (DFM) Acoustic Insulation Slabs are high-density soundproofing insulation slabs designed to reduce airborne sound transmission and control resonance within wall, floor, and ceiling cavities. These versatile slabs are ideal for soundproofing solutions in domestic and commercial spaces, available in thicknesses from 25mm to 100mm and densities from 45kg/m³ to 140kg/m³. Their robust construction absorbs and blocks sound, making them a top choice for enhancing acoustic performance within stud walls and floor joist cavities.
- Soundproofing: Wall soundproofing, floor soundproofing, ceiling soundproofing
- Noise type: Airborne noise (TV, radio, conversation, lower-medium noise levels)
- Noise reduction: Varies
- Size: Per slab 100mm x 1200mm x 600mm (0.72sqm)
- The pack quantities vary depending on the density
- Installation: DIY friendly
DFM sound insulation slabs
DFM Acoustic Insulation Slabs – High-Density Soundproofing for Walls, Floors & Ceilings
Our DFM Acoustic Insulation is best used for soundproofing walls, floors, and ceilings. It can also be used inside stud walls, between ceiling joists, below floorboards, and in most soundproof systems.
DFM sound insulation slabs block and absorb sounds from transferring between rooms. We offer DFM sound insulation slabs in 25mm, 50mm, 75mm, and 100mm sizes.
We use DFM acoustic insulation slabs in our soundproofing systems for walls and ceilings. The thickness supplied in the kits varies by solution; one constant across them is the density, which is 60kg/m³. After extensive testing, we have found 60kg/m³ to be the optimal density for combining sound insulation slabs with other soundproofing products.
- Thickness 25mm up too 100mm
- Density 45-140kg/m3 – This is not the weight of the pack or slab; it is the weight of the material if it were a meter cubed
- Slab size 1200mm x 600mm x 100mm (0.72sqm per slab)
- Fire rating 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
- Thermal conductivity 0.034 W/mK
When handling fibrous acoustic slabs, we recommend wearing gloves, especially if you have sensitive skin, to avoid mild irritation.
Before installation, check that the insulation thickness matches the cavity depth. Never compress slabs into a cavity that’s too shallow. For example, avoid fitting a 100mm slab into a 75mm space. Full cavity fill is not required for effective soundproofing.
Cutting and fitting the slabs is simple. Use a serrated knife (an old bread knife works well) to cut each slab slightly wider than the opening. This allows the insulation to friction-fit securely between studs or joists. If extra support is needed, secure slabs with a few nails, screws, or a wire mesh.
This approach ensures maximum acoustic performance without compromising installation quality.
Delivering soundproofing throughout the UK
Due to the nature of most of the materials we supply, orders are typically delivered on pallets.
All orders will be carefully wrapped, protected, and securely palletised to ensure they arrive in the best possible condition. Goods will be delivered as near to the property as possible. The drivers will not be able to carry orders into your property.
Deliveries are made between 8:00 a.m. and 6:00 p.m. Monday to Friday.
We charge a flat delivery rate of £60 plus VAT for most palletised deliveries. We do not charge per pallet, regardless of the number of pallets used to deliver your order.
Certain postcodes will incur a higher delivery charge than our standard rate, including those in Northern Ireland, Northern Scotland, and the Islands off the mainland.
Orders placed for items weighing less than 20kg will be sent via courier for £20 plus VAT.
We have a high stock level and typically deliver orders in approximately three to four working days.
If you would like to speak with us about your delivery, please call 01423 339163. Alternatively, you can send us your delivery enquiry.
Please review our full delivery terms for more information.
We don’t currently deliver outside the UK.
Frequently bought together
Alternative solutions
Alternative solutions that will offer different levels of soundproofing or another kind of installation method that might suit your requirements.
Got a question?
Send us a message, and we’ll respond as soon as possible. Alternatively, call 01423 339163 to speak with an adviser.