Silent Floor Ultra Acoustic Underlay - Individual Sheets

  • 1200mm x 600mm individual sheets
  • 11mm thick genuine acoustic underlay
  • Composite of 5kg MLV & 25kg/m3 PU foam
  • Impact sound reduction of 42dB
  • Effective for reducing impact and airborne noise under carpets


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Silent Floor Ultra Acoustic Underlay - 600mm by 1200mm by 11mm thick


Upgrade Your Floors with Silent Floor Ultra: Unleash Quiet Comfort and Peace of Mind

Tired of incessant footsteps echoing through your home? Seeking solace from the noise pollution that disrupts your tranquillity? Look no further – Silent Floor Ultra is your answer to enhanced acoustic serenity.

What's Inside the Box?

Each sheet measures 600mm x 1200mm and is 11mm thick. With each sheet covering 0.72sqm, use these individual sheets to finish off the install if you are a few short.

Benefits You Can't Ignore:

🔇 Silence Impact Noise: Bid farewell to the annoyance of footsteps and the clatter of objects hitting the floor. Silent Floor Ultra is your shield against impact noise, letting you walk and live freely without disturbing those below.

🎶 Suppress Airborne Noise: Elevate your sanctuary by silencing airborne noise – from conversations to the blare of the television. Enjoy unparalleled privacy and blissful solitude.

🏡 Effortless Installation: Designed for simplicity, Silent Floor Ultra is a breeze to install. Place the sheets with the foam side facing up, ensuring a snug fit. A touch of contact adhesive around the perimeter of each sheet ensures no wandering underlay. And voila! The luxury underfoot feel of the high-density closed-cell cross-linked PU foam becomes your reality.

🚪 Seamless Transition: At a sleek 11mm thickness, Silent Floor Ultra blends seamlessly into your living space. No more concerns about door gaps or awkward transitions between different floor types.  Simply butt it up to your existing carpet gripper.

🛡️ Durable, Long-lasting: Our secret? Combining the reliability of 5kg soundproofing mat with the strength of 25kg/m3 closed-cell cross-linked PU foam. Unlike flimsy recycled foams, this composite guarantees endurance over time, staying resilient and effective.

For Your Underfoot Haven:

Just imagine your carpeted floors absorbing footsteps and muting disturbances. Silent Floor Ultra thrives beneath carpets, offering the ultimate soundproofed haven. Lay it foam side up, ensuring a snug fit between sheets. To keep your underlay in place and to eliminate "walking," use our contact adhesive. Trim with precision using a sharp knife and proceed with your carpet installation – business as usual, but quieter.

Expert Tips for Amplified Serenity:

Ready for next-level tranquillity? Bolster your efforts with a few savvy steps. Address squeaky and loose boards before installation. Seal any gaps with our Acoustic Sealant for comprehensive sound isolation. For an added boost, add an additional layer of our 5kg Soundproofing Mat under the Silent Floor Ultra – a small addition with immense returns.

Silent Floor Ultra: Your Path to Quiet Bliss

Experience a home where noise is merely a whisper. Elevate your space with Silent Floor Ultra and reclaim your peace. From footsteps to conversations, enjoy soundproofed serenity like never before.

Embrace the Quiet Revolution:

Revolutionize your living experience today. Say goodbye to disruptive noise and reclaim your sanctuary. Order Silent Floor Ultra now and elevate your lifestyle with the tranquillity you deserve. Let silence reign supreme.


The Technical Details


Product Name Silent Floor Ultra Acoustic Underlay
Product Size 1200mm x 600mm x 11mm
Tiles Per Pack
Area Covered Per Pack 0.72sqm
76 (Durometer Shore A, 1 sec dwell)
Tensile Strength
0.9mpA (JISK6251)
Elongation at Break >100% (JISK6251)
Dimensional Stability 2% (4hr @ 100oC)
Surface Tension >44 dynes/cm
Product Colour Grey
Product Weight 5.2kg/m2
Fire Classification <100 mm/min (FMVSS 302)
Impact Sound Reduction 42dB


Silent Floor Ultra Performance Data

First ensure that the floor is completely clean, free of dirt and debris. Before you begin installation it is good practice to ensure that there are no loose floorboards. Loose boards can squeak and once the basic floor system has been fitted there won’t be any access to the floorboards. When screwing the floorboards down ensure that you will not screw through pipes or cables. If possible remove existing skirting so that you can run the soundproofing mat right up to the wall.

1. Seal any gaps in the floorboards with AC95 Acoustic Sealant. If there are holes that are too large for sealant repair the floor with replacement boards.

2. Lay the first layer of Soundproofing mat on the floor in the direction perpendicular to the direction of the floorboards. Glue the soundproofing mat down using Advanced Acoustics Contact Adhesive to minimise ‘walking’ of materials. Lay the soundproofing mat right up to the edges of the room folding it up the wall by approximately 40mm. Use a Joint Roller to assist in folding the mat right into the corner. This will help to minimise flanking sound. When laying the soundproofing may ensure there are no gaps between sheets.

3. Tape all the joints with Jointing Tape.

4. If you have opted for a second layer of soundproofing mat lay this perpendicular to the first layer of soundproofing mat, again ensuring you leave no gaps. Glue the soundproofing mat down as you go. Fold the matting up the walls approximately 40mm.

5. Again tape all the joints with jointing tape.

6. You can now refit your skirting.

7. Fix your carpet gripper in place fixing through the matting to the floorboards underneath.

8. Lay the Silent Floor Ultra in a brick bond fashion, perpendicular to your previous layer of soundproofing mat. Ensure there are no gaps. It should be fitted foam side up. The Silent Floor Ultra should be butted up to the carpet gripper.

9. Tape the joints with Jointing Tape.

10. You are now ready to install the carpet.

To quickly find out the shipping cost for your order simply add the required items to your cart. Place your cursor over the cart icon at the top of the page. Click on "Calculate Cart Shipping". Select your country and region and enter your postcode. The shipping rate will be displayed. If your country is not listed please contact us for a shipping quote.

UK Shipping Charges For Most Products

Orders with a value of £0.00 to £54.99 have a £7.00 carriage charge with tracked next working day delivery.

Orders with a value of 55.00 to £99.99 have a £12.00 carriage charge with tracked next working day delivery.

Orders with a value of £100.00 or more qualify for free next day shipping.

Excluded Items

For carts which contain Plasterboard, Soundproofing Mat, SilentBoard, QuietPanel, Silent Floor Ultra, M20 and R10 the following charges apply

£8.00 carriage for the first item and £4.00 carriage for every item added up to a maximum charge of £75.00.

Some soundproofing items have a minimum order due to shipping constraints.

Bulk Products have a £75.00 pallet charge per item.


Our policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange. To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.

Non-returnable items:- Made to order items such as our Office Acoustic Panels and High End Audio Acoustic Panels, Gift cards.

To complete your return, we require a receipt or proof of purchase. Please contact us for your return authorisation number. Once your return is received and inspected, we will send you an email to notify you that we have received your returned item.


We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at and send your item to: Advanced Acoustics LTD, Unit B, Maunside, Green Line Industrial Estate, Mansfield, NG18 5GU, United Kingdom.

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