PU Acoustic Underlay Board 10 mm — 100 × 200 cm, 200 kg/m³

The 10 mm composite polyurethane (PU) acoustic underlay board is ten times denser than standard market underlays: 200 kg/m³ against 20 to 30 kg/m³ for a classic lightweight foam. That density extends sound absorption down to 50 Hz — the low frequencies lightweight foams leave untreated. Format 100 × 200 cm, 2 m² per board, priced at 20 EUR excluding VAT per m2 with volume discounts.

Why density is the deciding criterion

Acoustic insulation works through two mechanisms: absorption (the material dissipates sound energy) and mechanical decoupling (it stops vibration reaching the rigid structure). A lightweight foam lacks the mass to do either at low frequency — it simply compresses under load. At 200 kg/m³, the PU board holds its structure, resists deformation and absorbs from 50 Hz upwards, covering the rumble of cardio machines, the bass of an audio system and pipework vibration.

• Density 200 kg/m³ — approx. 1.8 kg/m² at 10 mm
• Absorption from 50 Hz, low frequencies included
• Hypoallergenic, mould-resistant and antibacterial foam
• Anti-slip surface; clean cutting with a knife in two passes
• 100 × 200 cm — 2 m² per board; also available in 7 mm

Main uses

The primary role is as an underlay beneath floating parquet, laminate flooring or carpet — the 10 mm thickness is the format that fits most renovations without door adjustment. For an upper-floor gym, it is laid directly on the concrete to treat the low frequencies transmitted to the structure, with rubber tiles on top handling surface impacts: the two products work as a system, underlay decoupling below, tiles absorbing above. On walls it installs behind plasterboard — or as a visible wall covering that can be painted or papered — in music studios and rehearsal rooms, and it serves as one component of a broader acoustic treatment in industrial areas and shooting ranges.

Specifications

What to know before ordering

At this price point the board targets projects where acoustic performance is a documented requirement — upper-floor gyms with neighbour complaints, office buildings, music rooms, spaces with continuously vibrating equipment — not basic domestic flooring, where a standard underlay suffices. The PU foam is not a vapour barrier: on concrete in contact with the ground, lay a 150-micron PE film first. And allow a 5 to 10% cutting margin — for 50 m² net, order 27 to 28 boards rather than 25.

Frequently asked questions

7 mm or 10 mm — how to choose?

By door clearance. In renovation, every millimetre of underlay reduces the free height under doors: if clearance is already tight, take the 7 mm — same density, same properties, 3 mm saved. Where height is not constrained, the 10 mm gives slightly better impact-noise absorption.

How is a clean cut made on a 100 × 200 cm board?

Lay the board flat on a rigid support, mark the line with a rule, then make a first moderate knife pass to half depth and a second, firmer pass on the same line. A worn blade compresses the foam instead of cutting it — change blades between boards. For curves around columns or pipes, cut a cardboard template first.

How does it combine with rubber gym tiles on an upper floor?

The PU board goes down first to decouple the structure from low-frequency energy; rubber tiles are laid on top to absorb surface impacts and protect the slab. Send your room plan for a zone-by-zone quotation of the two layers.

For a measured quotation — surface, thickness choice and volume pricing — send your project details to the Light In Fitness team; quotes are free and returned within 24 to 72 hours.