Rockwool RW3 50mm Insulation 600x1200mm 5.76m2

Name: Rockwool RW3 50mm Insulation 600x1200mm 5.76m2
Brand: Buildboard

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Details

Upgrade your build with this 50mm thick Rockwool RW3 acoustic sound insulation slab, designed for high-performance in both thermal and acoustic applications. Each slab is 1200 mm × 600 mm (standard size) and the pack covers approximately 5.76 m², making it a convenient bundle for partition walls, ceilings, floors, and refurbishment works. With a nominal density of ~60 kg/m³ and thermal conductivity around 0.034 W/mK, it delivers robust performance in limiting heat loss and reducing airborne sound transmission.

This slab boasts an A1 Euroclass non-combustible fire rating, ensuring it meets demanding fire-safety requirements — a major plus when you’re specifying for commercial builds, refurbishments or high-occupancy areas. The semi-rigid stone wool construction is easy to handle and cut, friction-fits neatly between joists, studs or rafters, which helps maintain acoustic integrity by minimising gaps.

The open-fibre structure of the stone wool is particularly effective at absorbing airborne sound waves and reducing reverberation, improving comfort levels in residential, commercial and multi-use buildings. It’s ideal where noise control is important — such as separating walls, media rooms, flats above/below. With the 50 mm thickness you’re striking a balance: more depth than ultra-thin panels, but still manageable in retrofit or tight cavity situations.

Installation is straightforward: measure the cavity, trim to fit, friction-fit or secure with fixings as needed, and finish with the appropriate lining (e.g., plasterboard or acoustic board). Ensure the slabs go edge-to-edge and avoid voids to preserve acoustic and thermal performance. The slab is also water-repellent and dimensionally stable, meaning long-term performance with minimal maintenance.

Whether you’re outfitting an office partition, upgrading the ceiling of a flat, or tackling a refurbishment where space is at a premium, the 50 mm Rockwool RW3 slab gives credible acoustic, thermal and fire performance in a trusted, spec-friendly format.

Key Features (bullet-style)

Thickness: 50 mm slab, ideal for moderate depth build-ups

Size: Standard 1200 mm × 600 mm sheet size

Coverage per pack: ~5.76 m² (pack quantity suited to this dimensions)

Density: ~60 kg/m³ — robust acoustic & thermal structure

Thermal conductivity: ~0.034 W/mK (λD)

Fire rating: Euroclass A1 non-combustible — highest standard for insulation materials

Material: Stone wool (rock mineral wool) – naturally fire-resistant, durable and resilient

Acoustic performance: Excellent for reducing airborne sound transmission and reverberation in walls, ceilings and floors

Easy installation: Semi-rigid slabs can be trimmed and fitted, friction-fit between studs or joists, minimal sagging

Long-term stability: Maintains shape, thickness and performance over the lifetime of the building

Suitable for a wide range of applications: interior partitions, separating floors/ceilings, retrofit/refurbishment where depth is limited

Technical Specifications

Product type: Rockwool RW3 slab (50 mm thickness)

Dimensions: 1200 mm (L) × 600 mm (W)

Thickness: 50 mm

Pack coverage: ~5.76 m²

Nominal density: ~60 kg/m³

Thermal conductivity (λD): 0.034 W/mK

Fire classification: Euroclass A1 (EN 13501-1)

Material: Stone wool (rock mineral wool)

Applications: Partition walls, ceilings, floors, refurbishment projects

Installation: Friction fit, cut to size, line with suitable boards and secure as required

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.