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View Product Reviews140mm Rockwool Flexi Acoustic Sound Insulation Slab (2.88m2/Pack)
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Product Overview
Delivery & Returns Information
How Our Delivery Works
We work with a nationwide network of trusted suppliers. As a result, items in your basket may be supplied by different suppliers and delivered separately. Where this applies, you'll see multiple delivery charges at checkout. We always aim to group products from the same supplier to keep delivery costs as low as possible.
Delivery Areas & Charges
Delivery charges listed on our website apply to mainland UK, excluding the following postcode areas: AB, CF, DD, DG, KW, IV, LA, LD, LL, NP, PH, SA, SY
If your delivery address falls within one of these postcode areas, we’ll be in touch before processing your order to confirm any additional delivery costs.
Please note: We do not currently offer delivery outside the UK mainland.
Standard (Nationwide) Delivery
| Insulation, Plasterboard and Drylining Products | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £150 | £40 ex. VAT |
| Between £150 - £350 ex. VAT | £35 ex. VAT |
| Over £350 ex. VAT | FREE |
| Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £100 | £15 ex. VAT |
| Between £100 - £200 ex. VAT | £10 ex. VAT |
| Over £200 ex. VAT | FREE |
| Screws & Fixings and Adhesives & Sealants | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £100 | £7.50 ex. VAT |
| Over £100 ex. VAT | FREE |
Express Delivery
| Express Delivery - Insulation and Plasterboard & Drylining | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £400 | £50 ex. VAT |
| Over £400 ex. VAT | £35 ex. VAT |
| Express Delivery - Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £300 | £50 ex. VAT |
| Over £300 ex. VAT | £35 ex. VAT |
Returns
We offer a 30 day returns policy on any faulty products.
Key Features
- {{home}} Use in ceilings, walls and floors
- {{local_fire_department}} A1 non-combustible
- {{volume_off}} Excellent acoustic and thermal performance
- {{public}} Zero Ozone Depletion Potential (ODP)
Technical Specification
| Product: | Flexi |
|---|---|
| Material Type: | Rock Mineral |
| Thickness: | 140mm |
| Width: | 600mm |
| Length: | 1200mm |
| Pieces Per Pack: | 4 |
| Sales Unit: | Pack |
| Sales Unit Coverage: | 2.88m2 |
| Brand: | Rockwool |
| Manufacturer's Reference: | 123330 |
| Thermal Conductivity: | 0.035W/mK |
| Fire Rating: | A1 Non-Combustible |
Technical Downloads
What is 140mm Rockwool Flexi?
Rockwool 140mm Flexi Insulation Slab is a high-performance insulation solution designed to deliver exceptional thermal and acoustic benefits. Featuring a patented flexible edge, this slab ensures a tight, friction-fit installation between timber and metal frames without the need for cutting or waste, optimising both ease of use and insulation integrity.
Crafted from renewable volcanic rock, Rockwool 140mm offers excellent fire resistance, achieving an A1 non-combustible rating. It also contributes to sustainable construction practices by reducing the overall carbon footprint of buildings.
Ideal for installation in walls, roofs, floors, and partitions, this insulation provides outstanding thermal efficiency, with a thermal conductivity of just 0.035 W/mK, ensuring comfortable living spaces and energy savings year-round.
Where Is 140mm Rockwool Flexi Used?
- 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
140mm Rockwool Flexi Slab 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 0.035 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
140mm 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
140mm 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
140mm Rockwool Flexi Storage & Handling
Rockwool Flexi 140mm slabs have a soft, fibrous texture, similar to the consistency of a loaf of bread. This makes them easy to cut with a simple serrated blade. For best results, we recommend marking the required dimensions on the slab before cutting to ensure accuracy and avoid mistakes.
When it comes to storage, we advise that you store the slabs inside in a cool, dry area.
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. 140mm Rockwool Flexi insulation slabs achieve Lambda 0.035W/mK.
Customer Reviews
has a great flexible edge for quick installation. extremely fire resistant. perfect for internal partitions.
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