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Acoustic insulation slabs for soundproofing floors, ceilings and walls

Acoustic Insulation 50mm DFM Per Pack

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£30.65£41.65 ex. VAT

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Delivery Information

Orders over £750ex.VAT FREE DELIVERY

Delivery charges £55ex.VAT is applied to most of the products we supply due to the weight and size of the materials.

£20ex.VAT for smaller items. This charge is applied when smaller items are ordered individually without materials that we must deliver on a pallet. When smaller items are purchased with materials delivered on a pallet, only the pallet charge will be applied.

Customer collections are available. You must arrange this with the sales team before the collection date. If you would like to collect materials, please call 01423 339163.

Goods delivered within 3-5 days.

Once you’ve placed your order, we will contact you to arrange a suitable delivery date.

Call 01423 339163 for more information

Find out more
No soundproofing solution is complete without acoustic insulation Dense Fibre Matting (DFM). Order yours online today.

Noisestop offers a range of DMF thickness and densities. These 50mm DFM slabs are ideal for home soundproofing solutions in your walls, floors and ceilings. Insert between stud cavities and joists to improve sound insulation between rooms and create a peaceful, private environment. These slabs are non-combustible, with a class ‘o’ fire rating, and can be friction fit.

Size: 1200mm x 600mm x 100mm density range between 45kg/m³-140kg/m³A1 Fire Rating

Call 01423 339163 for all enquiries. FREE DELIVERY ON ORDERS OVER £750ex.VAT



Acoustic Insulation 50mm DFMA1 Fire Rating

When it comes to soundproofing your home, you need the best! These 50mm Dense Fibre Matting (DFM) slabs are essential to any noise reduction project and can be used to insulate walls, floors and ceilings. For walls, combine with soundproof panels for the most effective sound reduction.

For floors and ceilings, place the slabs between joists. DFM acoustic slabs will friction fit if cut slightly larger than the stud cavity or floor joist. As well acoustic properties, DFM is a non-combustible product with a class ‘O’ fire rating.

Specifications 50mm DFM

DFM 50mm
Density Kg/m3
Thermal Conductivity
Slabs per packArea per pack

Dense Fibre Matting (DFM) acoustic insulation 1200mm x 600mm slabs

The Noisestop high-density acoustic slab range is available in a variety of thicknesses and densities. 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.

  • Install between timber/metal studs or between floor/ceiling joists
  • Cut to size and friction fit
  • Airborne sound insulation
  • Variety of thicknesses and densities
  • Non-combustible product
  • DFM is sold per slab

Slab size in mm and density kg/m³

  • All slabs are 1200mm x 600mm
  • Thickness mm 25, 50, 75 & 100
  • Density kg/m³ 45, 60, 80, 100, 140
Fitting DFM

DFM slabs are easy to fit. Cut the slabs slightly larger than the opening, and friction fit inside the cavity. Cut slabs to size using a hand saw or a sharp knife.

The DFM range comes with a choice of density, and this is how compacted the slab is (not the weight). The 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 best sound insulation for the money spent.

Why would you choose DFM acoustic insulation?

DFM acoustic slabs are one of the best ways of improving the sound insulation in a room. If you are trying to soundproof a room, DFM would be essential to insulate inside the cavities.

Need help with your soundproofing call 01423 339163, alternatively send us your enquiry. You can upload any relevant documents such as plans, drawings and pictures.

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    Additional information

    Weight 11 kg
    Slab Size

    1200mm x 600mm

    Choose Density kg/m³

    45kg/m³ (9 slabs per pack 6.48 sqm coverage), 60kg/m³ (8 slabs per pack 5.76 sqm coverage), 80kg/m³ (6 slabs per pack 4.32 sqm coverage), 100kg/m³ (4 slabs per pack 2.88 sqm coverage), 140kg/m³ (3 slabs per pack 2.16 sqm coverage)

    Available Thickness mm

    25, 50, 75, 100

    DFM acoustic insulation

    Product information

    Acoustic insulation guide


    Delivery Information

    Free Delivery

    Free delivery to mainland UK addresses on orders over £750*.

    Standard Delivery

    Our standard delivery charges are based on the delivery method that is most suitable for the products ordered. Most of the goods we sell are delivered on pallets. Some smaller items will be delivered via courier.

    Standard delivery charge for goods delivered on a pallet £55*

    Standard delivery charge for smaller items £20*

    Certain postcodes will incur additional charges. AB*, DD*, IV*, KW*, PA*, PH* will be charged at £56**. UK islands, including the following postcodes, will be charged £95*. PO30*, PO31*, PO32*, PO33*, PO34*, PO35*, PO36, PO37*, PO38*, PO39*, PO40*, PO41*, IM*, BT*, JE*, GY*

    When you are ordering multiple products, only one delivery charge will be applied if the order total before VAT is £750* or over free delivery will be applied automatically.

    If you have special delivery requirements, please let us know at the point of ordering. It is possible to leave delivery instructions when you place an online order.

    Special Deliveries

    We can arrange to have orders delivered on Saturdays. A surcharge would be applied of an additional £50.

    Please call 01423 339163 if you require any of these additional services.

    How long will delivery take?

    We aim to despatch orders within 2-3 days of placing your order.

    If you order online, you will receive a confirmation email that we have received your order, and it has gone through for processing. We will then contact you once the order is just about ready to be despatched to confirm a suitable delivery date. If you would like to discuss delivery times with us please call 01423 339163. We recommend contacting us if you require the goods to be delivered on a specific date before placing your order.

    If you place an order over the weekend, or on a Bank Holiday this will be confirmed as an order on the first working day after the weekend or Bank Holiday.

    If you need goods in a hurry give us a call. We carry most items in stock which can be delivered quickly if required, call 01423 339163.

    How will my order be delivered?

    The majority of orders we despatch are sent on pallets. We use a network of pallet distribution companies across the UK. All our pallet deliveries are kerbside deliveries. This means the pallet will be delivered as near to the delivery address as possible. Pallets are unloaded from the vehicles with a pallet truck. If it is possible the pallets can be dropped on driveways if they are accessible with the pallet truck.

    Pallet deliveries are normally made on 7.5-tonne vehicles that are similar in size to bin lorries. Occasionally larger vehicles are used. If you know of any reason why it might be difficult to deliver to your address with this type of vehicle, please let us know so we can pass the information on to the delivery company. Typical delivery problems can include parking restrictions, access issues for certain size vehicles, low bridges and overhanging trees. Call 01423 339163 if you are unsure.

    Unfortunately, the delivery drivers will not bring the goods into your property or unload the individual items from the pallets.

    Many of our items are heavy and often require two people to carry them safely.

    All orders sent on pallets are wrapped and secured to the pallet to protect them while in transit. Once you have received your order, we would recommend storing the materials inside. If you are planning on leaving your goods outside, you should use additional coverage to protect them from any adverse weather conditions.

    Damaged or missing items

    In the unfortunate event that items are damaged or missing when your order arrives, you should sign damaged or missing items on the driver’s paperwork. Call 01423339163 to let us know of the issue to allow us to quickly rectify the problem.

    We might ask for a picture of the damage; this is to speed up the process of arranging a suitable solution.

    To enable us to resolve any issues with your delivery it is important that you sign for your delivery when it arrives.


    Can I return items from my order? Yes, you can return unused items from your order that are in a salable condition. We can arrange to collect any unused materials and have them brought back to us. We would refund the cost of the items returned back to us less the shipping cost incurred by the company collecting the items. The cost to return the goods would be confirmed at the point of arranging the return. The refund would be paid once the goods have been brought back and have been checked at our warehouse.

    Alternatively, you can arrange to return the materials back to us, and we will issue a refund once they have been received.

    *All prices displayed are exclusive of VAT @ 20%. This will be added at the end of the checkout process before you confirm your order.

    If you require any additional information regarding deliveries, please give us a call 01423 339163, alternatively get in touch via our contacts page.

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