25mm Rockwool RWA45 Acoustic Sound Insulation Slab (11.52m2/Pack)

Why RWA45? 

• High-performance mineral wool insulation slab offering excellent acoustic, thermal, and fire-resistant properties.
• Tightly packed, porous fibres absorb sound, reducing noise transfer.
• Ideal for reducing airborne noise in walls, floors, and partitions in residential, commercial, and industrial buildings.
• Open-cell structure traps air, reducing heat transfer and maintaining consistent indoor temperatures, enhancing energy efficiency.
• Non-combustible with a Euroclass A1 fire rating - resists flames, slows fire spread, and improves fire safety.

Why 25mm? 

• Thinnest option in the RWA45 range, offering a cost-effective solution for situations where space is extremely limited but a basic level of thermal and acoustic insulation is still required. 
• Not typically used as a standalone solution due to regulatory requirements. 25mm is better suited to independent wall linings and applications where insulation performance upgrades are needed without significantly altering the wall's depth. 
• Best suited for non-critical areas or as an additional upgrade in spaces that already meet compliance standards.
• While 25mm is typically not sufficient to meet full thermal or acoustic regulations on its own, it can be layered or combined with other materials to achieve the necessary thickness.
• In steel frame party walls or existing masonry walls, 25mm RWA45 can be installed to add an extra layer of insulation when thicker slabs are already in place, helping to improve energy efficiency and noise control. 
• Provides an efficient performance boost without major structural changes.

Rockwool 

• Rockwool’s commitment to excellence and performance is evident in its wide range of mineral wool insulation solutions. 
• These products enable contractors, architects, and building professionals to create structures that deliver superior thermal, acoustic, and fire performance, all while meeting stringent industry regulations and sustainability standards.

Applications

• Interior timber or steel partition walls
• Interior timber frame floors
• Interior timber frame ceilings
• Acoustic ceilings and partition panels
• I-joist interior partitions
• Pitched roofs
• Party walls
• Industrial applications

Benefits

• Zero Ozone Depleting Potential (ODP) and Global Warming Potential (GWP).
• Rot-resistant - withstands mould and mildew.
• Thermal conductivity of 0.035 W/mK.
• Fire Classification (Reaction To Fire) - Euroclass A1 (BS EN 13501-1).
• Hydrophobic - reliable water-repellent properties.
• Excellent acoustic, fire and thermal performance.

Certifications

• A1 non-combustible in accordance with BS EN 13501-1 - achieving the highest possible level of fire performance/resists high temperatures
• CE and Key marked in accordance with BS EN 13162:2012 + A1:2015.v

The slabs are also certified by Lloyd's register of shipping as non-combustible materials for use on:

• Fixed offshore installations
• MED classed ships- DTLR MCA approval
• Rated non-combustible in accordance with ISO 1182 and IMO A. 799

Storage & Handling

• Store slabs indoors, in a dry and well-ventilated area, to prevent moisture absorption.
• Keep slabs off the ground by storing them on pallets or timber supports to avoid damage.
• Protect insulation from direct sunlight, rain, and extreme temperature fluctuations.
• Handle slabs with care to maintain their shape and effectiveness - avoid excessive compression.
• Use gloves and long sleeves when handling to prevent irritation from mineral wool fibres.
• Cut slabs easily with a serrated knife or insulation saw for a precise fit.
• Minimise dust by cutting in a well-ventilated area and using a dust mask if necessary.