Rockwool RW5

What Is Rockwool RW5? 

Rockwool RW5 provides designers with a single product that addresses Part L (energy), Part E (acoustics) and Part B (fire) requirements in typical stud-frame build-ups.

Once installed, it reduces heat loss, dampens airborne noise by more than 45dB when used with double plasterboard linings, and contributes up to 60 minutes of fire resistance, depending on the lining specification.

No blowing agents are used in manufacture, giving it zero ODP and negligible GWP. At end-of-life, the mineral content can be recycled back into stone-wool production.

Applications

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

Benefits

• Thermal Efficiency: Thermal conductivity of 0.034 W/mK allows typical stud or joist build-ups to  achieve today’s U-value targets without deepening the cavity. 
• Euroclass A1 Non-Combustible: Slabs will not ignite, melt or produce flaming droplets, helping partitions, floors and facades meet Part B fire-safety rules and extend evacuation time. 
• High Acoustic Damping: 100 kg/m³ density and non-directional stone-wool fibres dampen airborne sound; when paired with standard plasterboard linings, walls routinely exceed the 40 Rw dB benchmark for dwellings. RW5 can exceed 45 dB in double-board systems; basic single-board walls achieve 41-43 dB.
• Fast, Fix-Free Installation: Semi-rigid boards are cut slightly oversize and friction-fit between 400mm or 600mm studs, staying put without clips, netting or slump. 
• Long-Term Stability: Water-repellent yet vapour-open fibres resist rot, mould and settlement, so thermal and acoustic performance remain consistent over the building’s life. 
• Sustainable: Manufactured from abundant volcanic rock, RW5 contains zero ODP blowing agents, has negligible GWP, and can be recycled back into new stone-wool products at end-of-life. 
• Versatile Application: Suitable for timber or metal stud partitions, intermediate floors, service ceilings, roof voids and rainscreen back-pans, giving designers one certified product to satisfy Parts L, E and B.

Certifications

BS EN is British and European Standard Specifications. With over 100 years of experience, the British Standards Institute is recognised as the UK’s National standards body. BS EN considers Rockwool both:

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

Rockwool RW5 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

Storage

• Keep RW5 packs dry. Store them indoors if possible; if they must stay outside, set the pallets at least 100mm off the ground and cover with a waterproof but ventilated tarp. The shrink-wrap hood protects only for short-term site exposure. 
• Stack pallets on level ground and limit the height to about 2.5m to avoid compression or tipping.
  
  

Handling

• Lift whole pallets with a forklift or pallet truck; carry individual slabs by hand. Wear gloves and long sleeves (the fibres can cause temporary itching) and use a dust mask if working in confined or overhead areas. 
• Cut slabs with a serrated knife or insulation saw and vacuum up any dust - don’t use compressed air.