Silent Floor Ultra Acoustic Soundproofing Underlay 3.6 sqm Pack

• Separating floors in flats and apartments — the primary application. Between an upper floor flat and the flat below, impact noise from footsteps, dropped objects, and furniture movement is the most common source of noise complaints. Silent Floor Ultra replaces standard carpet underlay, upgrading the acoustic performance of the floor build-up without structural alteration. UK Approved Document E requires a maximum impact sound level of 62dB Ln,w for separating floors — Silent Floor Ultra should be specified as part of a full assessed floor build-up to achieve compliance.
• Upper floor rooms in houses — under carpet in bedrooms, living rooms, and home offices positioned above other occupied rooms. Where standard underlay is not providing sufficient impact noise reduction, Silent Floor Ultra is a direct replacement that adds meaningful acoustic performance to an otherwise standard carpet installation.
• Rental properties and HMOs — where carpet is a tenancy requirement and impact noise between floors is a recurring issue. Silent Floor Ultra fits within a standard carpet installation and requires no structural work, making it suitable for occupied or tenanted buildings.
• Commercial carpet installations — in offices, hotels, and commercial spaces where carpet is specified and floor-to-floor impact noise must be minimised. The tile format is well suited to commercial spaces with irregular room layouts, columns, and service penetrations.

• 42dB impact sound reduction. Standard carpet underlay typically achieves 15–25dB impact sound reduction depending on density and thickness. The addition of the 5kg/m² MLV barrier layer substantially increases performance by adding mass and decoupling the carpet from the subfloor structure.
• Composite construction — impact and airborne in one layer. Standard carpet underlay addresses impact noise only. The MLV barrier component of Silent Floor Ultra also resists airborne sound transmission through the floor structure — conversations, music, and low-frequency noise from below. A single 11mm layer replaces what would otherwise require two separate products.
• Direct replacement for standard carpet underlay. Silent Floor Ultra installs in the same way as conventional carpet underlay — no additional products, specialist tools, or structural alteration required. Carpet grippers and the carpet installation follow the same process as a standard fit.
• Pre-cut tile format — 600mm x 1200mm per tile. The tile format is easier to handle, transport, and cut than roll stock. Offcuts from one tile can be used elsewhere in the installation, reducing material waste compared with roll cutting.
• 11mm nominal thickness. Door clearances and transitions to adjoining floor types should be checked before installation, particularly in renovation projects where the existing floor level is close to the bottom of the door.
• Closed-cell cross-linked PU foam. Does not absorb moisture, resists compression set under sustained load, and maintains acoustic properties over time. Dimensional stability of 2% at 100°C ensures consistent performance in rooms with underfloor heating.

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.