THE FOUNDATION OF YOUR FLOOR

Find your underlay.

All our underlay in one place. Choose the flooring you’re laying, then compare comfort, support and technical details.

Carpet underlay

Cushioning for carpet, including specialist options for underfloor heating.

Everyday comfort

BALL & YOUNG

Cirrus 9mm

Luxury domestic

9mm thickness2.6 tog39–41 dB impact sound

£6.66/m²

Features & specifications

A comfortable 9mm layer for living rooms and bedrooms, with thermal insulation and impact-sound reduction.

Luxury domestic use
Resilient Cloud 9 APT core
Stretch-fit installation

Thickness: 9mm
Recommended use: Luxury domestic
Thermal resistance: 2.6 tog
Impact-sound improvement (laboratory): 39–41 dB
Core: Cloud 9 APT crumb
Top surface: Printed stitch-bonded crepe paper
Underside: White non-woven fabric
Original roll coverage: 15m²
Nominal roll dimensions: 1.37m × 11m
Nominal roll weight: 15.7 kg
Product density: 116 kg/m³
Core density: 100 kg/m³
BS EN 14499 classification: L/U
Compression work after 1,000 impacts: >150 J/m²
Retention of compression work: >80%
Thickness loss after static / dynamic loading: <5%
Resistance to cracking: Pass
Manufactured in: United Kingdom
Guarantee: For the life of the initial carpet installation when used in the recommended areas
Technical sheet: Issue 7 · 28 November 2020
Fire test: BS 4790: pass, medium radius of effect

Acoustic figures are manufacturer laboratory results, not a guaranteed reduction in your room.

Technical data sheet (PDF)

Lighter-use rooms

BALL & YOUNG

Cosi 8mm

Light / general domestic

8mm thickness2.4 tog31 dB impact sound

£4.48/m²

Features & specifications

A lightweight 8mm option for domestic rooms with low to medium wear. APT cushioning adds comfort beneath your carpet.

Low to medium domestic wear
Lightweight to handle
Stretch-fit installation

Thickness: 8mm
Recommended use: Light / general domestic
Thermal resistance: 2.4 tog
Impact-sound improvement (laboratory): 31 dB
Core: APT core
Top surface: Printed non-woven fabric
Underside: White non-woven fabric
Original roll coverage: 15m²
Nominal roll dimensions: 1.37m × 11m
Nominal roll weight: 11.1 kg
Product density: 92 kg/m³
Core density: 80 kg/m³
BS EN 14499 classification: GD/U – L/U
Compression work after 1,000 impacts: >100 J/m²
Retention of compression work: >50%
Thickness loss after static / dynamic loading: <10%
Resistance to cracking: Pass
Manufactured in: United Kingdom
Guarantee: For the life of the initial carpet installation when used in the recommended areas
Technical sheet: Issue 7 · 7 June 2020
Fire test: BS 4790: pass, low radius of effect

Acoustic figures are manufacturer laboratory results, not a guaranteed reduction in your room.

Technical data sheet (PDF)

Deep comfort

BALL & YOUNG

Connoisseur 10mm

Luxury domestic

10mm thickness2.8 tog42 dB impact sound

£7.87/m²

Features & specifications

A substantial 10mm underlay for luxury domestic spaces. Its resilient core provides cushioning and recovers after compression.

Luxury domestic use
Resilient Cloud 9 APT core
Stretch-fit installation

Thickness: 10mm
Recommended use: Luxury domestic
Thermal resistance: 2.8 tog
Impact-sound improvement (laboratory): 42 dB
Core: Cloud 9 APT crumb
Top surface: Printed stitch-bonded white crepe paper
Underside: Spun-bonded non-woven fabric
Original roll coverage: 15m²
Nominal roll dimensions: 1.37m × 11m
Nominal roll weight: 23.3 kg
Product density: 155 kg/m³
Core density: 140 kg/m³
BS EN 14499 classification: L/U
Compression work after 1,000 impacts: >150 J/m²
Retention of compression work: >75%
Thickness loss after static / dynamic loading: <5%
Resistance to cracking: Pass
Manufactured in: United Kingdom
Guarantee: For the life of the initial carpet installation when used in the recommended areas
Technical sheet: Issue 5 · 23 October 2020

Acoustic figures are manufacturer laboratory results, not a guaranteed reduction in your room.

Technical data sheet (PDF)

Extra cushioning

BALL & YOUNG

Cumulus 11mm

Luxury domestic

11mm thickness3.1 tog43 dB impact sound

£7.42/m²

Features & specifications

An 11mm cushion for rooms where comfort comes first, with thermal insulation and impact-sound reduction beneath your carpet.

Deep 11mm cushioning
Cloud 9 APT core
Stretch-fit installation

Thickness: 11mm
Recommended use: Luxury domestic
Thermal resistance: 3.1 tog
Impact-sound improvement (laboratory): 43 dB
Core: Cloud 9 APT crumb
Top surface: Printed stitch-bonded crepe paper
Underside: White non-woven fabric
Original roll coverage: 15m²
Nominal roll dimensions: 1.37m × 11m
Nominal roll weight: 18.7 kg
Product density: 113 kg/m³
Core density: 100 kg/m³
BS EN 14499 classification: L/U
Compression work after 1,000 impacts: >170 J/m²
Retention of compression work: >80%
Thickness loss after static / dynamic loading: <5%
Resistance to cracking: Pass
Manufactured in: United Kingdom
Guarantee: For the life of the initial carpet installation when used in the recommended areas
Technical sheet: Issue 9 · 28 May 2020
Fire test: BS 4790: pass, medium radius of effect

Acoustic figures are manufacturer laboratory results, not a guaranteed reduction in your room.

Technical data sheet (PDF)

Firm support

BALL & YOUNG

Contract 8mm

Heavy contract / domestic

8mm thickness2.0 tog35–37 dB impact sound

£7.42/m²

Features & specifications

A firm 8mm foundation for demanding domestic and contract areas. Suitable for stretch-fit and double-stick installation.

Heavy contract and domestic use
Firm support
Stretch-fit or double-stick

Thickness: 8mm
Recommended use: Heavy contract / domestic
Thermal resistance: 2.0 tog
Impact-sound improvement (laboratory): 35–37 dB
Core: Cloud 9 APT crumb
Top surface: Silver film with green printing
Underside: Silver film
Original roll coverage: 15m²
Nominal roll dimensions: 1.37m × 11m
Nominal roll weight: 20.1 kg
Product density: 167 kg/m³
Core density: 160 kg/m³
BS EN 14499 classification: HC/U
Compression work after 1,000 impacts: >130 J/m²
Retention of compression work: >90%
Thickness loss after static / dynamic loading: <5%
Resistance to cracking: Pass
Manufactured in: United Kingdom
Guarantee: For the life of the initial carpet installation when used in the recommended areas
Technical sheet: Issue 11 · 16 July 2026
Fire test: EN 13501-1: Dfl-s1; BS 4790: pass, medium radius of effect

Acoustic figures are manufacturer laboratory results, not a guaranteed reduction in your room.

Technical data sheet (PDF)

For underfloor heating.

QA HeatWave 8mm. Check your carpet and heating system together.

Carpet underlay for underfloor heating

QA FLOORING SOLUTIONS

HeatWave 8mm

An 8mm polyurethane foam underlay developed for carpet over compatible underfloor heating. Its 0.96 tog rating balances cushioning with heat transfer, while the heavy-traffic classification supports everyday use around the home.

8mmthickness15.07m²per roll0.96tog

Price to be confirmed

Check the combined carpet and underlay tog value against the heating system’s limit before selecting. Underlay colour varies between production batches.

Features & specifications

Designed for carpet over compatible underfloor heating
0.96 tog thermal resistance
BS5808 Luxury Use classification
Polyurethane foam described by QA as 100% recyclable

Product code: QAU-HWA-01
Dimensions: 1.37m × 11m
Supply coverage: 15.07m² per roll
Impact sound reduction: 36dB estimated from a similar product, not a measured HeatWave result
Underfloor heating: Yes, subject to system and floor compatibility
Moisture barrier: Not specified in the supplied technical sheet
Material: Polyurethane foam
Thickness tolerance: 8mm ±5%
Density: 110kg/m³ ±5%
Traffic rating: Heavy · manufacturer internal rating
Classification: Luxury Use · BS5808
Thermal resistance: 0.96 tog · EN ISO 11092:2014
Nominal roll weight: 13.3kg ±5% in technical sheet; product page lists 14kg
Hot metal nut test: Pass, low radius of effect · BS4790:1987 (2009)
Reaction to fire: Bfl-s1 · GB 8624-2006, GB/T 11785-2005, GB/T 8626-2007

QA describes the 36dB acoustic figure as an estimate based on a similar product. It is not a measured result for HeatWave or a guaranteed reduction in your room.

Check the combined floor and underlay thermal resistance against your heating system’s limits.

The sheet leaves static-loading, dynamic-loading and castor-chair result fields blank. No performance result is claimed for those tests.

Manufacturer technical sheet (PDF)

Explore HeatWave

Match your underlay to the room and installation method. For underfloor heating, ask us to check the combined carpet and underlay tog rating. Quantity is measured in m², not full rolls.

Laminate & wood underlay

Support and moisture-control options for compatible floating floors.

Low thermal resistance

QA FLOORING SOLUTIONS

TimberTech Elite Plus 3mm

A dense 3mm underlay for laminate and wood floors, combining acoustic support with a silver vapour barrier. Its low thermal resistance suits compatible underfloor heating systems.

3mmthickness10m²per roll0.1tog

Price to be confirmed

Features & specifications

0.1 tog thermal resistance
21dB impact sound reduction
Integrated vapour barrier

Product code: QAU-TTE-02
Dimensions: 1m × 10m
Supply coverage: 10m² per roll
Impact sound reduction: 21dB ±2dB
Underfloor heating: Yes, subject to system and floor compatibility
Moisture barrier: Integrated vapour barrier
Thickness tolerance: 3mm ±0.3mm
Density: 850kg/m³ ±10%
Walking sound reduction: Up to 32% ±2% · EPLF WD 021029-5
Thermal resistance: 0.1 tog · DIN CEN/TS 16354
Compressive strength: Up to 120kPa · DIN EN 826
Compressive creep: Approximately 29kPa
Dynamic load resistance: More than 2,000,000 cycles
Large-ball resistance: Approximately 800mm
Punctual conformability: Approximately 1.55mm
Reaction to fire: Bfl-s1 · DIN EN 13501-1
VOC class: A+

Sound figures are manufacturer test results, not a guaranteed reduction in your room.

Check the combined floor and underlay thermal resistance against your heating system’s limits.

Manufacturer technical sheet (PDF)

Natural wood fibre

QA FLOORING SOLUTIONS

FineFloor FibreBoard 5mm

Rigid natural wood-fibre boards for supporting floating laminate and wood floors. This is the 5mm, 7.02m² version, intended for installations without underfloor heating. Subfloor preparation and moisture protection must suit the floor being installed.

5mmthickness7.02m²per pack—tog not stated

Price to be confirmed

Features & specifications

Natural wood-fibre construction
18dB impact sound reduction
Not recommended for underfloor heating

Product code: QAU-FFF-03
Dimensions: 590 × 850mm boards
Supply coverage: 7.02m² per pack
Impact sound reduction: 18dB
Underfloor heating: Not recommended
Moisture barrier: Not included
Material: Natural wood fibre
Density: 260kg/m³ +10% (manufacturer sheet)
Thermal conductivity: 0.050W/mK
Compressive strength: Greater than 150kPa
Static bending strength: At least 1.6MPa
Material humidity: Up to 9%
Thickness swelling after 2 hours: Up to 8%

Sound figures are manufacturer test results, not a guaranteed reduction in your room.

Where a moisture barrier is required, it must be specified separately for the subfloor.

The sheet covers several pack sizes. This listing is QAU-FFF-03: 5mm, 7.02m². The separate 10.03m² pack and its board count do not apply.

Manufacturer technical sheet (PDF)

Recycled PU foam

QA FLOORING SOLUTIONS

TimberTech2 Everlay 3mm

A 3mm recycled polyurethane underlay for floating laminate and engineered wood floors. A silver vapour-barrier film is combined with acoustic cushioning. Use with unbonded installations only, after checking the flooring and subfloor requirements.

3mmthickness10m²per roll0.97tog

Price to be confirmed

Features & specifications

Recycled polyurethane foam
22dB impact sound reduction
Silver vapour-barrier film

Product code: QAU-TEV-01
Dimensions: 1m × 10m
Supply coverage: 10m² per roll
Impact sound reduction: 22dB
Underfloor heating: Yes, subject to system and floor compatibility
Moisture barrier: Integrated vapour barrier
Material: Recycled polyurethane foam
Density: 200kg/m³ ±10%
Thermal resistance: 0.97 tog
Installation method: Floating / unbonded laminate and engineered wood
Surface film: Silver vapour barrier

Sound figures are manufacturer test results, not a guaranteed reduction in your room.

Check the combined floor and underlay thermal resistance against your heating system’s limits.

See TimberTech2 Everlay on printed page 43 of the manufacturer directory. A separate product-specific data sheet has not been supplied.

Manufacturer technical directory (PDF)

For underfloor heating

QA FLOORING SOLUTIONS

QuickTherm 1.8mm

A slim, perforated closed-cell polyethylene underlay for laminate and wood floors over compatible low-temperature heating. It provides support with low thermal resistance. A separate moisture barrier is needed where the subfloor specification requires one.

1.8mmthickness10m²per roll0.35tog

Price to be confirmed

Features & specifications

0.35 tog thermal resistance
Approximately 19dB impact sound reduction
No integrated moisture barrier

Product code: QAU-QTH-01
Dimensions: 1m × 10m
Supply coverage: 10m² per roll
Impact sound reduction: Approximately 19dB · DIN ISO 140-8
Underfloor heating: Yes, subject to system and floor compatibility
Moisture barrier: Not included
Material: Perforated closed-cell polyethylene foam
Walking noise reduction: 6 Sone (SL10) · EPLF Norm 021029
Thermal conductivity at 10°C: 0.052W/mK
Thermal resistance: 0.035m²K/W · 0.35 tog
Compressive strength at 10% compression: Approximately 60kN/m² · DIN EN 826
Long-term load-bearing capacity: Less than 5.0kN/m² · DIN EN 1606, as stated in sheet
Fire classification: Class B2 · DIN 4102

Sound figures are manufacturer test results, not a guaranteed reduction in your room.

Check the combined floor and underlay thermal resistance against your heating system’s limits. QA specifies low-temperature systems with maximum heating temperatures below 45°C; the floor’s own lower surface limit still applies.

Where a moisture barrier is required, it must be specified separately for the subfloor.

The sheet’s unloaded temperature-stability test is not an allowable floor temperature. Follow the heating system and floor manufacturer’s operating limits.

Manufacturer technical sheet (PDF)

Choose your underlay in the laminate product’s “Finish the floor” section. Your area remains editable. Prices and selling units require confirmation before ordering. Compatibility depends on the exact flooring and subfloor; these products are not automatically offered for click LVT.

Click LVT underlay

Choose an underlay approved for the exact flooring. Floors with attached underlay do not need a second layer.

For compatible click LVT

QA FLOORING SOLUTIONS

SoundBarrier LVT Underlay

A 1mm high-density polypropylene foam underlay for approved click and glue-down LVT systems. It combines acoustic performance, compression resistance and moisture protection, with a low thermal resistance for compatible heated floors.

1mmthickness15m²per roll0.4tog

£6.21/m²

15m² roll: £93.12

Use only where the exact flooring manufacturer approves it. Do not add underlay beneath flooring with an attached underlay. Herringbone laminate compatibility must be confirmed for the particular range.

Features & specifications

24dB impact sound reduction
Compressive strength greater than 280kPa
0.4 tog thermal resistance

Product code: QAU-SBR-02
Dimensions: 15m² per roll
Supply coverage: 15m² per roll
Impact sound reduction: 24dB · ISO 10140-3:2010
Underfloor heating: Yes, subject to system and floor compatibility
Moisture barrier: Integrated vapour barrier
Material: High-density polypropylene foam
Reflected walking sound reduction: 31%
Compressive strength: Greater than 280kPa
Water vapour resistance (SD): Greater than 114m
Thermal resistance: 0.04m²K/W · 0.4 tog
Mould and mildew resistance: Yes

Sound figures are manufacturer test results, not a guaranteed reduction in your room.

Check the combined floor and underlay thermal resistance against your heating system’s limits.

The linked technical sheet illustrates the older QAU-SBR-01 6m² roll. Our supplied QAU-SBR-02 format is 15m²; current product-page performance figures agree with the sheet.

Manufacturer technical sheet (PDF)Manufacturer installation instructions (PDF)Luvanto Click Herringbone LVT installation guide (PDF)