50mm Rockwool Flexi Acoustic Sound Insulation Slab (8.64m2/Pack)

What Is 50mm Rockwool Flexi? 

50mm Rockwool Flexi Insulation Slab is a versatile solution offering exceptional thermal, acoustic, and fire performance in one durable package.

Measuring 1200mm x 600mm, this Flexi slab serves as a dual-purpose thermal and acoustic insulator, featuring a unique flexible edge designed to snugly fit between timber and metal frame systems. This design minimizes air gaps, ensuring both thermal and acoustic integrity.

Ideal for use in metal and timber framing systems, these slabs are crafted from renewable volcanic rock, providing outstanding fire resistance with a classification of A1 non-combustible. Additionally, they contribute significantly to reducing a building's carbon footprint.

While matching the thermal and acoustic performance of sister slabs like Rockwool RWA45, what distinguishes these 50mm Rockwool Flexi Slabs is their patented flexible edge, facilitating perfect friction fitting within the supporting framework.

Cut at 1200mm x 600mm, they are suitable for various installations including wall frames, roofs, floors, and partitions, boasting a thermal conductivity of 0.038W/mK. Each pack contains 12 slabs, providing coverage for approximately 8.64 square meters per pack.

Where Is 50mm Rockwool Flexi Used? 

50mm Rockwool Flexi is considered effective thermal insulation for use all over the home, in pitched roof rafters, framed external walls, internal partitions, intermediate floors, separating walls and floors, and timber suspended ground floors. 

The flexible edge helps to overcome the problems that come with fresh timber shrinkage by expanding into the wider space as the timber dries out. 

The slabs can be used for the following construction types:

• 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

50mm Rockwool Flexi Benefits

• Low Global Warming Potential (GWP) and Zero Ozone Depleting Potential (ODP)
• Part E acoustic rating (resistance to sound) when installed in accordance with ROCKWOOL guidelines
• Rot-resistant - withstands mould and mildew
• Thermal conductivity of 0.038 W/mK
• Water repellent qualities of the insulation prevent moisture build-up, dampness and rot
• Excellent acoustic and thermal performance
• Will not slump, even if studs shrink
• Friction fit for timber and metal frames 
• Fire resistance

50mm Rockwool Flexi 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

50mm Rockwool Flexi insulation 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

Rockwool 50mm Flexi Slab Storage & Handling

The Rockwool Flexi 50mm slabs possess a soft, fibrous texture reminiscent of a loaf of bread, rendering them easily cuttable with a serrated blade. It is advisable to mark the required dimensions on the slab before cutting to mitigate errors.

For storage, it is recommended to keep the slabs indoors to maintain their integrity and prevent moisture absorption, ensuring they remain dry and in optimal condition.

About Rockwool

Rockwool is recognised as being the market-leading acoustic insulation solution. The Rockwool Flexi slab range offers outstanding thermal, acoustic and fire insulation properties as well as lifelong durability. 50mm Rockwool Flexi insulation slabs achieve Lambda 0.038W/mK.