Description

Rockwool RW3 25mm Insulation 600x1200mm 11.52m2

The Rockwool RW3 25mm acoustic insulation slab offers premium-grade performance in thermal, acoustic and fire protection. Designed for use in stud walls, ceilings, floors and partitions, it’s the choice for installers who demand reliability in both residential and commercial settings.

Key Features

• Thickness: 25 mm slab depth — allowing slim build-ups when space is tight.

• Size: Standard slab dimensions of 1200 mm × 600 mm.

• Density: Nominal ~ 60 kg/m³, giving robust acoustic absorption while remaining practical to handle.

• Thermal Conductivity (λD): 0.034 W/mK — effective at reducing heat loss.

• Fire classification: Euroclass A1 (non-combustible) — highest fire safety rating for insulation slabs.

• Multi-application: Suitable for partition walls, suspended ceilings, separating floors, internal walls, roofs.

• Water-repellent and non-hygroscopic: maintains performance even in challenging environments.

• Easy to install: Semi-rigid slabs friction-fit into stud or joist cavities; straightforward trimming and placement.

Technical Specifications

Why Choose This Product?

If you’re working on installations where space is limited but you still need strong performance, this slab is a smart pick. The 25 mm thickness is ideal for retrofit or refurbishment jobs where adding depth isn’t an option. At the same time, you get the dual benefit of acoustic insulation (which helps reduce sound transmission) and thermal insulation benefits, plus top-tier fire safety to meet building regs.

Also, the product is from Rockwool — a trusted brand in the insulation world — so you’re selling something that carries credibility. The specification data backs the performance and gives your customers confidence.

Installation & Application Tips

• Ensure the slab is cut slightly oversize to fit the cavity snugly without gaps — this maximises acoustic and thermal efficiency.

• Use in stud-frame walls, ceilings or floors; make sure slabs are butted together with no voids.

• For acoustic treatments (e.g., between joists or in partitions), ensure the slab is supported and secured so it doesn’t sag.

• In humid or exposed environments, ensure cavities are ventilated appropriately; while the product is water-repellent, good installation practices still matter.

• Seal any penetrations (pipes, cables, joints) to maintain the acoustic/fire performance of the system.

Suitable Applications

• Internal partitions in residential or commercial builds where sound separation is required.

• Suspended ceilings or floors where a slim thickness is preferred.

• Refurbishments where adding too much depth is not feasible.

• Areas requiring fire compartmentalisation, thanks to the A1 non-combustible rating.

Summary

For installers and merchants looking for a high-spec, slim-profile solution, the Rockwool RW3 25 mm acoustic slab hits the mark: 25 mm thickness, excellent acoustic and thermal properties, top fire safety rating, and backed by a trusted brand. Great for tight cavities, sound-sensitive builds and spec-heavy projects.

If you require an extremely high performing, easy to handle multi-application insulation, this product is perfect for the job. If you require a high volume of this product – please contact us for a quote.

Contact us today for more information on 0113 204 7303 or contact us here.