Rockwool RW3 Slab | Acoustic Insulation Slab 40mm 50mm 100mm

Rockwool RW3 Slab – Acoustic Insulation — 40mm, 50mm & 100mm

Rockwool RW3 is a premium high-density stone wool acoustic insulation slab designed for exceptional performance across walls, floors and ceilings. With a density of 60kg/m³, this Rockwool slab significantly reduces airborne sound transmission while delivering thermal efficiency and passive fire protection in a single product. Available in three thicknesses to suit a range of acoustic and construction requirements.

Why Specify a Rockwool Slab for Acoustic Installations

Superior Acoustic Performance

At 60kg/m³, Rockwool RW3 is one of the highest density stone wool slabs available for construction use. Higher density means better sound absorption — RW3 effectively reduces airborne noise transmission through walls, floors and ceiling assemblies, making it the preferred Rockwool slab for acoustic partitions, cinema rooms, studios and plant rooms.

Euroclass A1 Fire Rating

Rockwool RW3 carries a Euroclass A1 non-combustible fire classification — the highest level of fire performance available. Using RW3 in walls, ceilings and floors helps compartmentalise buildings, reducing fire spread and protecting both structure and occupants.

Thermal & Acoustic in One

RW3 combines acoustic insulation with thermal performance, reducing the need for separate products in wall and floor builds. It improves energy efficiency while simultaneously reducing sound transmission — ideal for residential apartments, commercial offices and industrial buildings.

Easy to Install

Rockwool RW3 slabs are easy to cut, handle and install on site. They can be friction-fitted between joists and studs or mechanically fixed depending on the application. RW3 maintains its shape over time without sagging or shrinking, ensuring long-term consistent performance.

Where to Use Rockwool RW3 Slab

• Internal partition walls
• Timber joist and concrete floors
• Ceiling and soffit assemblies
• Plant rooms and HVAC systems
• Cinema rooms and recording studios
• Residential, commercial and industrial builds

Pack Specifications by Thickness

Key Features

• High-density stone wool insulation slab
• 60kg/m³ density for enhanced acoustic performance
• Excellent thermal, acoustic and fire protection
• Suitable for partitions, ceilings, floors and HVAC systems
• Helps reduce airborne sound transmission
• Euroclass A1 non-combustible fire rating
• Durable, water-repellent and long-lasting
• Easy to cut and install on site
• Maintains shape without sagging or shrinking

For full technical data and product specification, visit the Rockwool RW3 product page on the Rockwool website.

For more information or project enquiries contact us and our team will be happy to help.

Order Rockwool RW3 Acoustic Insulation Slab

Available now at acousticmaterials.ie in 40mm, 50mm and 100mm. Fast nationwide delivery available on all orders.