50mm Rockwool Flexi is a multi-purpose stone wool insulation delivering both thermal and acoustic performance. Distinguished by its patented flexible edge design on one side, this product ensures superior installation quality.
The 50mm Rockwool Flexi slab incorporates a patented flexible edge mechanism that achieves a precise friction fit between the insulation and structural framework. Installation is straightforward—simply position between fresh timber framing. As timber naturally dries and shrinks, the insulation expands to fill gaps completely. Classified as Euroclass A1 non-combustible, 50mm Flexi Slab delivers enhanced thermal and acoustic insulation capabilities.
This product performs effectively across numerous building applications, including pitched roof rafters, timber-framed external walls, and internal partitions.
Thickness: 50mm
Width: 600mm
Length: 1200mm
Dimensions: 1200x600mm - 8.64m2
Density: 33kg/m3
Weight of 1m2: 1.65kg
Weight: 15.12kg
Thermal Conductivity: 50-120mm 0.038 W/mK / 140mm> 0.035 W/mK
R-Value: 1.32m2K/W
Product Standards: BS EN 13162
Reaction to fire (Euroclass): Euroclass A1
Acoustic: Achieves Part E (resistance to sound) when installed in accordance to ROCKWOOL guidelines
Water vapour resistance: 5.2 MNs/gm
Water repellent: Yes
• Superior thermal performance characteristics. • Effective sound dampening properties. • Euroclass A1 non-combustible rating. • FLEXI Edge technology delivers secure friction fit. • Maintains position as timber studs dry and contract. • Mineral wool insulation batts (slabs) CE marked to BS EN 13162:2012+A1:2015
50mm Rockwool Flexi represents a distinctive non-combustible insulation slab engineered with an innovative flexible edge mechanism. Utilising patented technology, it provides rapid installation with a reliable friction fit that guarantees consistent performance. The flexible edge maintains optimal contact between the product and supporting structure, facilitating straightforward installation and reliable thermal-acoustic effectiveness.
Rockwool Flexi 50mm demonstrates considerable versatility across building applications. From timber-framed external walls and roof rafters to floor systems and partition walls, this insulation product performs consistently across diverse scenarios. Its flexible design allows seamless integration throughout building structures, enhancing both thermal efficiency and acoustic performance.
With 50mm Flexi Insulation Slab, you benefit from innovative engineering and dependable quality to address your insulation requirements effectively.
Explore our comprehensive Rockwool range and refine selections by thickness or coverage using the left-hand filters. For technical guidance on product suitability for your project, or to request a quantity discount quotation, contact us via telephone on +4402038839057, email sales@insulationbee, or use our Live Chat service for competitive UK Insulation pricing.








