• XPS Insulation Board 6mm 10mm 20mm 30mm
  • Thickness options from 6mm, 10mm, 20mm, and 30mm of insulation board
  • closeup of laying down the underfloor heating insulation board
  • model image of xps insulation boards layered on the floor
  • Size chart showing the area calculation in m2
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XPS Insulation Boards | High-Performance Underlay for Flooring, Underfloor Heating & Soundproofing – 6mm, 10mm, 20mm, 30mm

XPS Insulation Boards | High-Performance Underlay for Flooring, Underfloor Heating & Soundproofing – 6mm, 10mm, 20mm, 30mm

£4.19 GBP
£5.99 GBP £4.19 GBP
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Description:

Choosing the wrong underlay causes problems long after installation day — cold floors, footstep noise carrying between rooms, or flooring that shifts and creaks over time. A flat, dense, well-insulated base underneath is what actually determines how your finished floor performs.

Our XPS insulation boards are built from extruded polystyrene foam, prized for combining strong thermal performance with genuine structural rigidity. With a 300 kPa compressive strength, the boards support high surface loads without compressing or losing shape — so your flooring stays level and stable for years, not just on installation day.

They're just as effective at cutting noise as they are at retaining heat. With impact sound insulation of up to 20dB, these boards significantly reduce footstep noise transmission — a common source of complaints in flats, upper floors, and multi-room homes. Combined with low water absorption and anti-fungal, mildew-resistant properties, the boards stay stable and hygienic in damp or high-traffic environments, without rotting or breaking down.

Available in 6mm, 10mm, 20mm, and 30mm thicknesses, they're equally suited to floor levelling under laminate and solid wood flooring, use as a subfloor underlay under tiles and screed, or upgrading the thermal efficiency of an underfloor heating system. Beyond flooring, the same properties make them a practical choice for wall and ceiling insulation and general soundproofing projects.

Installation is clean and straightforward — the boards are non-dusting, non-toxic, and odourless, so there's no mess and no fumes, whether you're a tradesperson working across multiple jobs or a homeowner fitting a single room.

Specification Detail
Product type XPS insulation board / underlay
Core material Extruded Polystyrene (XPS) foam
Panel dimensions 1200mm x 600mm
Available thicknesses 6mm, 10mm, 20mm, 30mm
Compressive strength 300 kPa
Impact sound insulation Up to 20dB
Water absorption Low — moisture, mould, and mildew resistant
Surface properties Non-dusting, non-toxic, odourless
Recommended uses Underfloor heating, laminate/solid wood underlay, subfloors, tiles & screed, wall/ceiling insulation, soundproofing
Guarantee Lifetime guarantee

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Features

  • Panel size: 1200mm x 600mm
  • Thickness options: 6mm, 10mm, 20mm, 30mm
  • Compressive strength: 300 kPa
  • Impact sound insulation: Up to 20dB
  • Water resistance: Low water absorption, anti-fungal and mildew resistant
  • Surface finish: Non-dusting, non-toxic, odourless
  • Load capacity: Withstands high weight surface loads
  • Compatible flooring types: Laminate, solid wood, tiles, screed
  • Guarantee: Lifetime guarantee on quality

Key Benefits

  • Warmer, more energy-efficient floors — high thermal performance reduces heat loss, especially effective under underfloor heating systems.
  • Quieter rooms — up to 20dB of impact sound insulation cuts footstep noise between floors.
  • Stays flat under pressure — 300 kPa compressive strength keeps floors level even under heavy furniture or high foot traffic.
  • Moisture and mildew resistant — low water absorption and anti-fungal properties prevent rot, keeping the board stable long-term.
  • Clean, safe installation — non-dusting, non-toxic, and odourless, with no special handling required.
  • Lifetime guarantee — quality assured, so you can install with confidence.

FAQ's

Q: What thickness should I choose?
A: It depends on your project. Thinner boards (6mm–10mm) suit floor levelling and underlay beneath laminate or solid wood flooring, while thicker boards (20mm–30mm) are better suited to underfloor heating upgrades or projects needing greater thermal or acoustic performance.

Q: Can these boards be used with underfloor heating?
A: Yes. The XPS core provides strong thermal performance, helping to reduce heat loss and improve the efficiency of underfloor heating systems.

Q: Will these boards help reduce noise between floors?
A: Yes. They provide impact sound insulation of up to 20dB, which noticeably reduces footstep noise transmission — useful in flats, upstairs rooms, or shared buildings.

Q: Are the boards suitable for damp areas?
A: The boards have low water absorption and are resistant to mould and mildew, making them suitable for a range of environments, though dedicated waterproof boards are recommended for wet rooms and showers.

Q: How much area does one board cover, and how do I calculate what I need?
A: Each board measures 1200mm x 600mm (0.72m²). Multiply your room's length by width in metres to get the total area, then divide by 0.72 to estimate the number of boards required — it's worth rounding up slightly to allow for cuts and wastage.

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  • Why Customers Love It

    Genuinely good value. Several customers specifically call out the price-to-quality ratio, with one noting the boards cost less for an entire room than a local supplier quoted for a much smaller area.

    Easy to cut and work with. Reviewers consistently describe the boards as simple to handle and cut to size, suiting both first-time DIYers and repeat trade customers.

    Reliable, well-packaged delivery. Fast dispatch and secure packaging come up again and again in feedback — orders arriving quickly and in good condition, even for smaller quantities.

    More versatile than expected. Beyond flooring and underfloor heating, customers have used these boards successfully for van insulation, soundproofing, and even model-making projects — a sign of just how consistent and workable the material is.