High Density xps Floor Insulation Boards – Thermal & Soundproof Underlay 3mm

High Density xps Floor Insulation Boards – Thermal & Soundproof Underlay 3mmanna11 February 2026

High Density xps Floor Insulation Boards – Thermal & Soundproof Underlay 3mm

Price range: £32.99 through £117.99 (VAT INCLUDED)

The Expert Eko Matt CEZAR underlay is made from high-quality extruded polystyrene foam (XPS). It effectively levels minor subfloor irregularities, offers high compressive strength, and provides excellent impact sound insulation.

The underlay is supplied in individual boards with a thickness of 3 mm, allowing for easy cutting and fast installation. It is suitable for all types of floating floors, including laminate, vinyl click flooring, engineered wood, and wood-based floors.

Ideal for use with underfloor heating systems.

For additional moisture protection, the use of a vapour barrier foil is recommended.

Key Properties

  • Format: 1000 × 500 mm
  • Coverage per pack: 5 m²
  • Thickness – 3mm
  • Compressive strength (CS): ≤ 60 kPa
  • Thermal resistance (R): 0.110 m²K/W
  • Vapour diffusion resistance (SD): 0.0025 m
  • Thermal conductivity (λ): 0.024 W/(m·K)
  • Density (ρ): approx. 30 kg/m³
  • Impact sound insulation (IS): 18 dB

Description

Specialized Underlay for Floating Click Vinyl and other Flooring

Thickness: 3 mm

EKO MATT CEZAR UNDERLAY

Product Information

  • Material: Extruded Polystyrene Foam (XPS)
  • Dimensions: 50 × 100 cm
  • Thickness: 3 mm
  • Color: Grey
  • Manufacturer: CEZAR
  • Coverage: 1 pack = 5 m²

Product Description

The Expert Eko Matt CEZAR underlay is made from high-quality extruded polystyrene foam (XPS). It effectively levels minor subfloor irregularities, offers high compressive strength, and provides excellent impact sound insulation.

The underlay is supplied in individual boards with a thickness of 3 mm, allowing for easy cutting and fast installation. It is suitable for all types of floating floors, including laminate, vinyl click flooring, engineered wood, and wood-based floors.

Ideal for use with underfloor heating systems.

For additional moisture protection, the use of a vapour barrier foil is recommended.

Key Properties

  • Format: 1000 × 500 mm
  • Coverage per pack: 5 m²
  • Thickness – 3mm
  • Compressive strength (CS): ≤ 60 kPa
  • Thermal resistance (R): 0.110 m²K/W
  • Vapour diffusion resistance (SD): 0.0025 m
  • Thermal conductivity (λ): 0.024 W/(m·K)
  • Density (ρ): approx. 30 kg/m³
  • Impact sound insulation (IS): 18 dB

Benefits

  • Thermal Insulation

Thanks to its insulation properties, the underlay creates an effective barrier against cold subfloors. It reduces heat loss, lowers heating costs, and improves overall thermal comfort.

  • Moisture Protection

Moisture is one of the biggest threats to laminate and wooden floors, as it promotes the growth of mould and microorganisms. The material structure of the underlay limits moisture migration, increasing the durability of the floor.

(SD value applies to underlays with an integrated vapour barrier.)

  • CS – Compressive Strength

To prevent damage to click-locking systems, the underlay must not permanently compress or deform. High compressive strength (CS) ensures effective load transfer without reducing thickness, protecting the floor joints from damage.

  • Suitable for Underfloor Heating

Manufactured using innovative technology, this underlay features very low thermal resistance, allowing efficient heat transfer into the room. Optional perforations in the base further improve heat distribution from the heating system to the floor surface.

  • Walking Sound (Room Acoustics)

Walking noise is generated by footsteps and perceived within the same room. The underlay absorbs and dampens vibrations, improving room acoustics and reducing echo.

  • Impact Sound Insulation

Impact sound is transmitted to adjacent or lower rooms. The underlay significantly reduces impact noise, improving acoustic comfort in multi-storey buildings.

  • Compensation of Local Subfloor Irregularities

Thanks to its asymmetric structure—one smooth side and one uneven side—the underlay helps compensate for minor subfloor imperfections. This protects the flooring from bending, sagging, and damage to click joints over time.

Installation

CEZAR underlays are designed for quick and easy installation. Their functional shape, size, and connection method allow fast adaptation to room dimensions and precise fitting.

Fire Behaviour

Fire classification defines the flammability and combustion properties of the material. Floor underlays are categorized according to established fire reaction classes.

Application

CEZAR underlays are specifically designed for installation under floating floors. They level subfloor irregularities and provide effective impact sound insulation under laminate, wood, vinyl, and wood-based flooring.

Storage

Store the underlays in their original packaging, away from organic solvents, excessive heat, and direct sunlight. Protect the packaging from mechanical damage.

Transport

Transport in original packaging in accordance with national transport regulations. Protect the load from mechanical damage and overheating.

For enhanced moisture protection, the use of a vapour barrier foil is recommended.

Environmental Responsibility

For environmental safety, store the product indoors. Minimize waste and separate materials for recycling. The product packaging is recyclable and environmentally friendly. The manufacturing process allows the use of various energy sources to ensure sustainable and eco-conscious production.

Additional information

SIZE

5m², 10m², 15m², 20m², 25m²

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