F7 Plus 15mm Sound Insulation Underlay 1.2m x 1.2m

1. 3mm Mass-loaded vinyl 7.5kg/m² – High mass barrier layer for sound absorption.
2.  Closed cell foam 9mm  – Acoustic grade foam to dampen and absorb vibration sound.
3.  3mm Mass-loaded vinyl 7.5kg/m² – High mass barrier layer for sound absorption.

• System thickness 15mm
• Size 1200mm x 1200mm (1.44sqm)
• Weight 23kg per sheet

Thermal Resistance R:

• Closed Cell Foam: 0.23 m² K/W
• Mass-loaded vinyl 0.14 m² K/W

Thermal Conductivity λR:

• Closed Cell Foam: 0.039 W/mK
• Mass-loaded vinyl 0.037 W/mK

Reaction to Fire

• Closed Cell Foam: FMVSS 302
• Mass-loaded vinyl 10kg EN 13501-1 B-s2,d0 (2

The higher the figure for airborne, the better the performance. The lower the figure for impact the better the performance.

Timber floor airborne results

18mm chipboard laid direct to 200mm joist with 10mm plasterboard.

Without soundproofing 41dB

With 15mm Acoustic Underlay 51dB

With 15mm Acoustic Underlay and 100mm insulation 55dB

With 15mm Acoustic Underlay and 100mm insulation with  Soundbreaker bars and 12.5mm plasterboard (two layers) 63dB

Timber floor impact results

18mm chipboard laid direct to 200mm joist with 10mm plasterboard.

Without soundproofing 79dB

With 15mm Acoustic Underlay 50dB

With 15mm Acoustic Underlay and 100mm insulation 48dB

With 15mm Acoustic Underlay and 100mm insulation with  Soundbreaker bars and 12.5mm plasterboard (two layers) 44dB

Concrete floor impact results

Due to the high mass of concrete flooring, acoustic underlays are only used to reduce impact noise.

200mm Concrete flooring

Without soundproofing 79dB

With 15mm Acoustic Underlay 50dB

Note: Every 10 decibels(dB) reduction in noise level is roughly perceived as a halving of the perceived loudness. So, for instance, if you have a sound that measures 70dB and it decreases to 60dB, it would sound about half as loud to the human ear. Decibels explained.

• Laid directly over the existing sub-floor
• Loose laid no requirement to bond to the floor. Part E requires bonding for new builds and conversions.
• Butt the edges together
• Reduce movement with High Tack Tape along the joins
• Cut to size using a sharp knife or a fine toothsaw

Carpet as the floor finish

Acoustic underlays can be used directly below the carpet. When installing the underlay, you should consider using the perimeter edging strip to ensure the gripper rods are the same height as the carpet. The gripper rods and the perimeter edging should be nailed to the floor using a 30mm nail.

Hard floor finishes equal to or less than 14mm

Hard floor finishes, including laminate, engineered, and tiles, should use a resilient layer between the soundproofing and the floor finish. We recommend a 9mm MDF interlocking T&G board. The layers are secured using a floor-grade adhesive such as Isobond floor adhesive. To prevent potential flanking sound from transmitting from the floor to the walls, isolate the flooring using isolation tape fixed to the wall.

Hard floor finishes over 14mm

Floor finishes over 15mm can be installed directly on the soundproof mats. Secure the flooring using the Isobond adhesive. Isolate the flooring using isolation tape fixed to the wall to prevent potential flanking sound from transmitting from the floor to the walls.

Product Brochure

Performance Data

Fitting

Due to the nature of our materials, most orders are delivered on pallets.

Each order is securely wrapped and palletised to ensure it arrives in perfect condition.

Deliveries are made Monday to Friday between 8:00 a.m. and 6:00 p.m., and goods will be dropped as close to the property as possible. Please note, drivers are unable to carry items indoors.

Palletised deliveries are charged at a flat rate of £60 + VAT, regardless of how many pallets are required. Smaller orders under 20kg are sent via courier at £20 + VAT.

We hold high stock levels and aim to deliver within 3–4 working days. Once your order is placed, you’ll receive confirmation of the expected delivery date. Please ensure someone is available to sign for the goods.

Need a specific delivery date or have questions? Contact us or call us on 01423 339163 – we’re happy to help. For full details, please review our delivery terms.