Description

Rockwool RW5 25mm Insulation 600x1200mm 5.76m2

The Rockwool RW5 25mm Acoustic Insulation Slab is a premium, high-density stone wool slab engineered for optimal acoustic, thermal and fire performance. With a thickness of 25 mm and standard panel size of 1200 mm × 600 mm, this pack (typically 8 slabs) covers approximately 5.76 m². 
Built with a nominal density of 100 kg/m³, the RW5 range delivers superior sound absorption — including low frequency noise control — making it ideal for high spec applications where acoustic performance is critical.
Thermally efficient with a thermal conductivity of 0.034 W/mK, it also helps improve energy performance in walls, ceilings and floors without adding significant depth.
For fire safety, the product is rated Euroclass A1 (non-combustible) under BS EN 13501-1, meaning it won’t burn and contributes to safer build environments. 
Installation is straightforward: semi-rigid slabs are easy to handle, cut to size and friction-fit or secure between studs, joists or rafters. The stone wool structure is water-repellent, dimensionally stable and will retain its performance over the lifetime of the building. 
Whether you’re specifying for commercial partitions, sound-sensitive residential projects (flats, media rooms, offices) or refurbishments where space is tight but performance cannot be compromised, the Rockwool RW5 25mm slab is a robust, trusted solution backed by the Rockwool brand.

Key Features

• Thickness: 25 mm – thin profile, strong performance

• Panel size: 1200 mm × 600 mm (L×W)

• Pack coverage: ≈ 5.76 m² (8 slabs per pack)

• Density: ≈ 100 kg/m³ – high density for acoustic effectiveness

• Thermal conductivity: 0.034 W/mK (λD) – excellent thermal insulation

• Fire rating: Euroclass A1 (non-combustible) – top fire safety performance

• Material: Stone wool (rock mineral wool) – resilient, dimensionally stable, water-repellent

• Applications: Internal partitions, separating walls, floors, ceilings, retrofit and new builds where acoustic and thermal performance are key

• Easy to cut and install, suitable for tight cavities where thicker slabs aren’t feasible

Why Choose This Product?

When you need insulation that ticks all three major boxes — acoustic, thermal and fire safety — yet have limited cavity depth, the 25 mm Rockwool RW5 slab delivers. Its high density gives it serious sound control credentials while the slim profile ensures you don’t lose head height or room space. Backed by a reputable brand, this is the type of product trade-specs buyers trust, and you’ll make it easy for them to choose you.

Technical Specifications

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.