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

URN: 3002222
£39.57ex. VAT £4.58 per m2
£39.57ex. VAT
£4.58 per m2
Bulk Discount
10+ packs 15+ packs 20+ packs
£39.14ex. VAT £38.97ex. VAT £38.79ex. VAT
50mm Rockwool Flexi Slab is a 2-in-1 thermal and acoustic insulation with a unique flexible edge that allows the product to be tightly fitted between timber and metal frame systems.

Nationwide Delivery

Tue 12 Mar

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Coverage required
m
m
Based on your total area of m2 (inc. 10% wastage) - of these are required (actual coverage of m2)

We recommend purchasing at least 10% extra product to allow for errors, damages or obstacles

Product Overview

50mm Rockwool Flexi Slab is a 2-in-1 thermal and acoustic insulation with a unique flexible edge that allows the product to be tightly fitted between timber and metal frame systems.

URN: 3002222
£39.57ex. VAT

Delivery & Returns Information

All delivery charges are shown in your basket and are dependent on the total value of items in your basket based on product category.

Standard (Nationwide) Delivery

Insulation, Plasterboard and Drylining Products
ORDER VALUE DELIVERY CHARGE
Under £150 ex. VAT £50 ex. VAT
Between £150 - £300 ex. VAT £35 ex. VAT
Over £300 ex. VAT FREE
Timber & Sheet, Building Materials, Doors & Joinery and Gardens & Landscaping Products
ORDER VALUE DELIVERY CHARGE
Under £100 ex. VAT £35 ex. VAT
Between £100 - £300 ex. VAT £20 ex. VAT
Over £300 ex. VAT FREE
SuperFOIL and YBS products
ORDER VALUE DELIVERY CHARGE
Each item £10 ex. VAT
Over £350 ex. VAT of 1 brand FREE
Screws & Fixings and Adhesives & Sealants
ORDER VALUE DELIVERY CHARGE
Under £100 ex. VAT £7.50 ex. VAT
Over £100 ex. VAT FREE
Thermafleece CosyWool Roll & SupaSoft Insulation
QUANTITY DELIVERY CHARGE
1 £30 ex. VAT
2 £60 ex. VAT
3 to 12 £70 ex. VAT
13 to 24 £140 ex. VAT
25 to 36 £210 ex. VAT
37 to 48 £280 ex. VAT
49 to 60 £350 ex. VAT
61+ £420 ex. VAT
Thermafleece CosyWool Slab, Thermafleece UltraWool & Thermafleece NatraHemp
QUANTITY DELIVERY CHARGE
1 £30 ex. VAT
2 £60 ex. VAT
3 to 4 £70 ex. VAT
5 to 8 £140 ex. VAT
9 to 12 £210 ex. VAT
13 to 16 £280 ex. VAT
17 to 20 £350 ex. VAT
21+ £420 ex. VAT

Express Delivery

Express Delivery - Insulation and Plasterboard & Drylining
ORDER VALUE DELIVERY CHARGE
Under £300 ex. VAT £50 ex. VAT
Over £300 ex. VAT £35 ex. VAT
Express Delivery - Timber & Sheet, Building Materials, Doors & Joinery and Gardens & Landscaping Products
ORDER VALUE DELIVERY CHARGE
Under £300 ex. VAT £50 ex. VAT
Over £300 ex. VAT £35 ex. VAT

This charge is based on delivery to mainland UK excluding the Scottish Highlands. If your delivery address is in the Scottish Highlands a member of our customer service team will contact you prior to processing your order should an additional delivery charge apply. We do not offer deliveries outside the UK mainland.

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Returns

We offer a 30 day returns policy on any faulty products.

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Key Features

  • Rot-resistant - withstands mould and mildew
  • Thermal conductivity of 0.038 W/mK
  • Water repellent qualities
  • Excellent acoustic and thermal performance
  • Will not slump, even if studs shrink
  • Friction fit for timber and metal frames 
  • Fire resistance

Technical Specification

Technical Specification
Material Type:Rock Mineral
Thickness:50mm
Width:600mm
Length:1200mm
Pieces Per Pack:12
Sales Unit:Pack
Sales Unit Coverage:8.64m2
Brand:Rockwool
Manufacturer's Reference:123318
Thermal Conductivity:0.038W/mK
Fire Rating:A1 Non-Combustible

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.

Reviews

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5/5 based on 1 review

This insulation has a unique flexible edge. used this in a few metal frame systems and loved how easy it went in. will use on my next building project.

Marc Thompson on

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