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75mm Foil Faced 2 Sides RW5 Insulation Slab 100kg (pack of 3)

75mm Foil Faced 2 Sides RW5 Insulation Slab 100kg (pack of 3)
75mm Foil Faced 2 Sides RW5 Insulation Slab 100kg (pack of 3)
75mm Foil Faced 2 Sides RW5 Insulation Slab 100kg (pack of 3)
75mm Foil Faced 2 Sides RW5 Insulation Slab 100kg (pack of 3)
75mm Foil Faced 2 Sides RW5 Insulation Slab 100kg (pack of 3)
  • 75mm Double Sided Foil Faced Fire Slab Rockwool RW5
  • 100kg density - Foil Faced on Both Sides Fire Barrier Slab
  • Developed to prevent the spread of flames and inhibit heat
  • Conform with the Building Regulations Approved Document B
  • Excellent fire performance classified as Euroclass A1 | Class 'O'
Estimated delivery:
In Stock
£ 250.98
Ex VAT: £ 209.15
  • Brand: Rockwool®
  • Model: Double Sided Foil RW5 - 75mm
  • Weight: 8.88kg
  • Dimensions: 1,200mm x 600mm x 75mm
  • SKU: 75mm RW5 2FF
  • Product code: P1-2519
  • MPN: Double Sided Foil RW5 - 75mm

Options available

75mm Foil Faced Two Sides Rockwool RW5 Insulation Slab is a rigid aluminium foil faced on both sides stone wool 100kg density insulation slab used to prevent the spread of flames and inhibit heat through concealed spaces in buildings.

Double Sided Foil Faced Fire Barrier Slab RW5 Rockwool 75x600x1200mm fire performance integrity is 240 minutes, and 60 minutes for the insulation core with a certified thermal conductivity (lambda value) of 0.034W/mK.

Rockwool Foil Faced Both Sides RW5 Fire Barrier Slab is a high density (100kg per m3) non-combustible foil backed double sided material with an excellent fire performance classified as Euroclass A1 / Class 'O'.

RW5 Fire Barrier Slab 75mm offers great thermal, acoustic and fire insulation properties, is water repellent, durable, cost effective, easy to handle and install solution that is suitable for both new build and refurbishment projects.

Rockwool Double Sided Aluminium Foil Slabs are simple butt joint products that can be used where fire resistant walls need to be continued above a ceiling into the roof void.

Foil Faced Two Sided Slab RW5 conforms with the Building Regulations Approved Document B and fulfils all normal fire insulation requirements for division of space.

Special sizes and thicknesses are available, made to order: black or white tissue and aluminium foil facings on one or both sides are available in 600mm wide by 1200mm long insulation slabs.

Rockwool insulation does not contain gases that have ozone depletion potential (ODP) or global warming potential (GWP).




Thickness: 75mm

Width: 600mm

Length: 1200mm

Pack Quantity: 3

Slab Coverage: 0.72m2

Pack Coverage: 2.16m2

Finish: Foil Faced 2 Sides

Density: 100kg/m3 

R-Value: 2.20m2K/W

Thermal Conductivity: 0.034W/mK

Vapour Resistivity: Negligable, Water Repellent

Building Regulations: Class ‘O’ 

Fire performance: Euroclass A1 (non-combustible)


Foil Backed Double Sided Rockwool RW5 Insulation Slab Features:

 · High density (100kg per m3) non-combustible.

 · Aluminium foil faced both sides.

 · Fire and acoustic stone wool core insulation slab.

 · Excellent thermal, acoustic and fire performance.

 · Non-combustible Euroclass A1 material.

 · Easy to handle, cut and install.

 · Offers the highest level of fire resistance.

 · Durable insulation solution.

 · Maintain high performance over the lifetime of the building. 

 · Water repellent qualities.

 · Prevent moisture build up, damp and rot.

 · Excellent sound absorption characteristics provide high levels of sound reduction. 

 · Thermal conductivity (λ - lambda value) of 0.034W/mK.

 · Free from CFCs, HCFCs.

 · ODP free.

 · GWP free.


Rockwool RW5 Foil Faced 2 Sides Certification, Standards and Approvals:

 · Fire Slab has been independently tested and assessed to BS 476: Part 20 and Part 22 by accredited laboratories.

 · Rockwool achieves a reaction to fire classification of A1 as defined in BS EN 13501:1.

 · They are third party approved for performance and quality by the Loss Prevention Council Certification board (LPCB) and are listed in their Fire and Security ‘Red Book’ - certificate no. 022c/02.

 · The product has been authorised for use in LUL surface and sub-surface premises when installed in accordance with the data sheet.

 · Rockwool Fire Slab has been tested in accordance with BS EN ISO 10140-2:2010 achieving Rw 23dB. Test Report N° C/23667/T01.

 · The safety of Rockwool stone wool is confirmed by current UK and Republic of Ireland health and safety regulations and EU directive 97/69/EC:Rockwool fibres are not classified as a possible human carcinogen.

 · Made from a renewable and plentiful naturally occuring resource, Rockwool insulation saves fuel costs and energy in use and relies on trapped air for its thermal properties.

 · Rockwool is approximately 97% recyclable.


*Further information may be found in our Downloads section.

Fairly easy access to all PDF files.

Datasheet ǀ Declaration of Performance - DoP ǀ BBA Certificate ǀ Installation Guide ǀ Certificates ǀ Brochure ǀ SPEC Sheet 

Board covarage 2.16 m2
Colour Light brown
Density 100kg/m3 
Fire Rating (Reaction to Fire) 30-240 minutes
Length 1200mm
Material Stone Wool ǀ Aluminium Foil
Pack Coverage 2.16m2
Pack Quantity 3 slabs FFx2
Profile Square Edge
R-Value 2.20m2K/W
Size 75mm x 600mm x 1200mm
Thermal Conductivity 0.034W/mK
Thickness 75mm
Width 600mm
Fire Classification Class 'O'
Vapour Resistivity Negligable, Water Repellent
Slab Coverage 0.72m2
Building Regulations Approved Document B
Coverage 2.16m2
Fire performance Euroclass A1 (non-combustible)
Finish Foil faced two sides
Quantity 3 slabs per pack
Shipping method Articulated Vehicle ǀ Courier
Applications Walls ǀ Ceilings ǀ Floors ǀ Roofs
Foil faced Both sides
ETA Notification Yes
Features Double Sided Foil RW5 Fire Barrier Slab
Manufacturer Rockwool RW5®

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We deliver insulation materials to Mainland UK only. Deliveries to Highlands, Northern Ireland, Isle of Wight etc.. might be possible at additional cost.
We offer free delivery on most of the orders above £300 (excluding VAT) (except special products - shipping cost via courier - products marked ''Request A Quote'')

Delivery of some insulation materials might be extended due to the current situation (Covid-19, stock shortages, allocations).
If you need materials quickly please contact us - we will do our best to help you source materials needed.

We do not deliver on weekends and bank holidays. Sometimes we can deliver on Saturdays - please check with us before placing the order.
If you need any further information please contact us tel. 02081910776

We can help to calculate price per m2 or linear meter (one meter in length) cost, please just contact us via phone 02081910776, email or live chat. Alternatively, you can work it out yourself quickly and easily: to get cost per meter square please divide price shown in orange area by ''Required area (m2)'' Example price of £28.80 divided by board coverage 2.88m2 = cost of £10.00 per m2.


No matter whether you choose a local installer or a national company, there’s a few tips to help you find the right installer for your home insulation improvements, such as asking for recommendations and making sure that they’re part of a certification scheme. This makes sure that they have the right skills and standards of workmanship to carry out the installation, and you can be sure that they know exactly what they are doing.


1. Thermal inspection picture in portfolio

It’s worth seeing a installer’s previous work. There’s no harm asking if you can see any properties nearby that they’ve installed insulation in. Best way would be to see Infrared Thermal Imaging Inspections. Thermal cameras spot small, but key changes in temperature in different areas of a house, identifying problematic areas that the human eye never could and some that a visual inspection could only hypothesize.

2. Reviews

Along with checking recommendations and previous work, finding reviews online can often be a great way to find out if they provide a good service or not. However, it’s best not to solely rely on reviews you may find or review websites, as there’s no controlling who writes them.

3. Compare prices

Comparing prices will also ensure companies can’t take advantage of you and give you a fair price. 

4. Word of Mouth

The best way to find a great insulation installer is through recommendations. Make sure you ask friends and family. They will most likely give you their honest opinion and can tell you from first hand experience.


Whether you require a wall, cladding, external wall, loft or floor insulation fitted, you can find and hire your local insulation installers from popular UK web pages. A simple internet search will return thousands of potential installers near your area.



We are the stockist of construction materials and related products for both trade and DIY from most recognizable brands in the UK like Cordek, RCM, Promat, Rockwool, Isover, Celotex, Xtratherm, Ursa, Low-E, Cedral, Kingspan, Dufaylite, British Gypsum, K-rend, Ecotherm, Iko enertherm, Kay-Metzeler, Terrawool to allow you to complete your insulation job on time at competitive prices and the highest standards.


Whether you are a large company or a DIYer, if you need a large amount of insulation materials, we can offer quantity discounts at the best prices. Please contact us and our friendly customer service will try to find the best and cheapest solutions for you. We value your time and we will try to deliver the products as soon as possible at a reasonable price to your construction site or house. The UK's leading insulation supplier near you and your needs. Price List available upon request.
75mm Foil Faced 2 Sides RW5 Insulation Slab 100kg (pack of 3)
75mm Foil Faced 2 Sides RW5 Insulation Slab 100kg (pack of 3)
£ 250.98