Rockwool Flexi slabs are high-performance mineral wool insulation boards designed for timber frame, stud wall and floor applications. Featuring a flexible edge for a secure friction fit, Rockwool Flexi insulation provides excellent acoustic absorption, thermal efficiency and fire resistance for residential and commercial construction projects across the UK.
Rockwool Flexi Insulation – Designed for Timber & Stud Walls
Rockwool Flexi slabs are a versatile mineral wool insulation solution specifically developed for internal partitions, timber frame systems and floor constructions. The key feature of Rockwool Flexi insulation slabs is their patented flexible edge, which ensures a tight friction fit between studs and joists. This reduces air gaps and improves both acoustic and thermal performance. Manufactured from natural stone, Rockwool Flexi slabs combine durability, fire resistance and long-term dimensional stability, making them suitable for both new build and refurbishment projects. If you are looking for reliable internal wall insulation that is easy to install and performs consistently over time, Rockwool Flexi slabs are a proven solution.
Acoustic Performance – Reducing Noise Transfer
Rockwool Flexi acoustic slabs are widely used to minimise airborne sound transmission between rooms and floors. The dense fibre structure absorbs sound waves and helps create quieter internal spaces.
Rockwool Flexi insulation is ideal for:
Stud wall partitions
Timber frame internal walls
Intermediate floors
Ceiling voids
Residential conversions
For projects requiring higher-density acoustic performance, you may also consider: Rockwool RWA Slabs
These products are often specified where enhanced sound insulation ratings are required.
Thermal Efficiency & Energy Savings
Rockwool Flexi insulation slabs provide excellent thermal conductivity
performance, helping to reduce heat loss through internal walls and floors. By
improving insulation continuity within stud cavities, Rockwool Flexi contributes
to improved U-values and energy efficiency.
Key benefits include:
Reduced thermal bridging
Improved indoor temperature control
Lower energy consumption Support for Part L compliance
While Rockwool Flexi slabs are primarily used in internal applications, for
external façade insulation systems you should explore:Rockwool Rainscreen Duo Slab
Fire Resistance & Safety
Rockwool Flexi slabs are non-combustible mineral wool insulation boards that
offer excellent fire resistance. Because they are manufactured from volcanic
stone, they can withstand extremely high temperatures without contributing to
flame spread.
This makes Rockwool Flexi insulation suitable for:
Residential housing developments
Timber frame buildings
Apartment projects
Commercial fit-outs
Fire safety is a critical factor in modern construction, and stone wool
insulation provides added reassurance in cavity and partition systems.
Flexible Edge Technology – Why It Matters
Unlike standard insulation boards, Rockwool Flexi slabs feature a unique
flexible edge along one side. This design allows the slab to compress slightly
and fit securely between studs without cutting or forcing.
Advantages of the flexible edge include:
✔ Reduced material waste
✔ Improved acoustic seal
✔ Faster installation
✔ Minimal gaps between insulation and timber
This makes Rockwool Flexi insulation slabs particularly popular with installers
and contractors working on timber frame or metal stud partitions.
Available Thickness Options
At Insulation Point, we supply Rockwool Flexi slabs in multiple thicknesses to
suit different build-ups and performance requirements, including:
50mm Rockwool Flexi Slab
60mm Rockwool Flexi Slab
70mm Rockwool Flexi Slab
90mm Rockwool Flexi Slab
100mm Rockwool Flexi Slab
140mm Rockwool Flexi Slab
The appropriate thickness depends on cavity depth, acoustic requirements and
thermal targets. You can browse the product listings above to select the correct
specification for your project.
Applications of Rockwool Flexi Slabs
Rockwool Flexi insulation slabs are commonly used in:
These are often selected where increased density and acoustic mass are required.
Sustainable Mineral Wool Insulation
Rockwool Flexi slabs are manufactured using natural volcanic rock and recycled
materials. In addition to supporting improved energy efficiency, mineral wool
insulation contributes to sustainable building practices.
Benefits include:
Long product lifespan
Dimensional stability
Recyclable material composition
Reduced building energy demand
For contractors and developers focused on sustainability, Rockwool Flexi
insulation supports environmentally responsible construction.
Rockwool Flexi Slabs – Competitive UK Supply
At Insulation Point, we offer competitive pricing across the full Rockwool Flexi
range. Whether you are a homeowner completing a renovation or a contractor
ordering in bulk, we provide:
Trade pricing
Bulk order discounts
Fast UK delivery
Technical product support
If you need guidance selecting the correct Rockwool Flexi insulation slab for
your project, our team is available to help.
Frequently Asked Questions – Rockwool Flexi Slabs
Rockwool Flexi slabs are primarily used for insulating timber frame and metal stud internal walls, floors and ceiling systems. They provide excellent acoustic absorption, thermal insulation and fire resistance in residential and commercial buildings.
Rockwool Flexi slabs feature a patented flexible edge on one side. This allows the slab to compress slightly and create a tight friction fit between studs and joists, reducing gaps and improving acoustic and thermal performance.
Yes, Rockwool Flexi acoustic slabs are highly effective at reducing airborne sound transfer between rooms and floors. They are commonly used in stud partitions and intermediate floor systems to improve acoustic comfort. For higher-density acoustic solutions, RWA45 or RW3 slabs may be recommended.
Rockwool Flexi insulation slabs are available in multiple thickness options including: 50mm 60mm 70mm 90mm 100mm 140mm The correct thickness depends on cavity depth and required acoustic or thermal performance.
Rockwool Flexi slabs typically offer a thermal conductivity of approximately 0.035–0.038 W/mK (depending on specification). This helps reduce heat loss and improve energy efficiency in internal wall and floor systems.
Yes, Rockwool Flexi insulation is manufactured from non-combustible mineral wool and provides excellent fire resistance. It can withstand high temperatures and does not contribute to flame spread, making it suitable for timber frame and residential applications.
Yes, Rockwool Flexi slabs are specifically designed for timber frame and stud wall construction. The flexible edge ensures a secure fit between timber studs, reducing air gaps and improving insulation continuity.
Yes, Rockwool Flexi insulation slabs provide effective thermal performance in internal walls and floors. They help maintain stable indoor temperatures and support compliance with UK building regulations.
Rockwool Flexi slabs are water-repellent but vapour permeable. This allows the structure to breathe while resisting moisture build-up within cavity systems.
Rockwool Flexi is ideal for friction-fit timber and stud wall applications where ease of installation is important. RWA45 is typically chosen for higher-density acoustic performance in partition and commercial systems.
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I searched the internet for a good bulk deal for PIR insulation panels. Insulation Point had the best deal and free delivery. I ordered and the delivery arrived early the next morning. Outstanding service – thoroughly recommended.
Cheapest insulation found online, well packaged, very prompt delivery with forklift for ease. helpful instruction throughout. We will buy through this company again.
Customer service with Insulation Point was probably one of the best I’ve received. I spoke with Mihir to arrange for a few items for soundproofing. Even after I had ordered the wrong insulation (my fault) Mihir helped get the right one sorted and a prompt return. I’d use them again. Also one of the cheapest retailers for building material.
InsulationPoint”s commitment to offering only top-tier brands such as kingspan, Celotex, and Rockwool means that I always get high-quality insulation materials for my projects. Their knowledgeable team is so helpful with technical queries, making them my first choice for insulation products.
I recently purchased building materials from insulationPoint for a renovation project. The quality of their products exceeded my expectations, and their competitive price kept me on budget. I highly recommend them to anyone in need of reliable building supplies.
InsulationPoint is my go-to online store. Their extensive range of products, from insulation panels, plasterboard, to acoustice insulation materials, always meets my project requirements. The expert advice and excellent customer service make shopping online a breeze.
Customer service is excellent at insulation point. They go the extra mile to help out and that’s important as a supplier. Will definitely use again. Thank you
We now use Insulation Point for all our building products and would advise anyone interested in high quality products and expert support to do the same.
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