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50mm Foil Faced Rockwool RW4 Class A1 Slab (pack of 6)

50mm Foil Faced Rockwool RW4 Class A1 Slab (pack of 6)
50mm Foil Faced Rockwool RW4 Class A1 Slab (pack of 6)
50mm Foil Faced Rockwool RW4 Class A1 Slab (pack of 6)
50mm Foil Faced Rockwool RW4 Class A1 Slab (pack of 6)
50mm Foil Faced Rockwool RW4 Class A1 Slab (pack of 6)
  • Foil Faced x1 Side Rockwool RW4 (80kg/m3) A1 Class 1200x600x50mm
  • Non-combustible resin bonded Rigid Stone Wool Insulation Slab RW4
  • Fire, thermal and acoustic slab used for a wide range of building applications
  • Manufactured in 80kg density per m3 - Class ‘0’ to Building Regulations
  • Fire performance integrity is 240 minutes, and 60 minutes for the insulation core
Estimated delivery:
In Stock
£ 275.88
Ex VAT: £ 229.90
  • Brand: Rockwool®
  • Model: Foil Faced 1 Side RW4 - 50mm
  • Dimensions: 1,200mm x 600mm x 50mm
  • SKU: Foil Faced 1 Side RW4 - 50mm
  • Product code: P1-3636
  • MPN: Foil Faced 1 Side RW4 - 50mm

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50mm Foil Faced Rockwool RW4 is used to prevent the spread of flames, heat, smoke and fire through concealed spaces in buildings, a rigid class A1 non-combustible resin bonded insulation slab.

Rockwool RW4 Foil Faced Slab 50mm x 600mm x 1200mm fire performance integrity is 240 minutes, and 60 minutes for the insulation core with a certified thermal conductivity of 0.034W/mK.

RW4 Insulation Slab is manufactured in 80kg density per m3, specially designed for use in soffits, floors, roofs at rafter level, partitions, ceilings, timber and steel frame walls.

Stone Wool Insulation Slab RW4 is classified as Class ‘0’ to Building Regulations and can be used in ceilings, floors and walls to help sectionalize rooms, reducing fire spread and damage.

RW4 Slabs work in two distinct ways to reduce noise, either by impeding the transmission of sound through an element of the structure or by absorption of sound at the surface.

The structure of the fibres in RW4 slabs make them ideal for use as a sound absorber with water repellent qualities of the insulation preventing moisture build up, damp and rot.

Rockwool RW4 insulation slabs are made from natural, sustainable and recyclable resources and can be easily cut and shaped with a large bladed knife or saw.

These thermal and acoustic insulation slabs are free of CFCs and HCFCs and will not encourage the growth of fungi, mould or bacteria.




Thickness: 50mm

Width: 600mm

Length: 1200mm

Pack Quantity: 6

Slab Coverage: 0.72m2

Pack Coverage: 4.32m2

Finish: Foil Faced x1 Side

Density: 80kg/m3 

R-Value: 1.45m2K/W

Thermal Conductivity: 0.034W/mK

Vapour Resistivity: Negligable, Water Repellent

Building Regulations: Class ‘O’ 

Fire performance: Euroclass A1 (non-combustible)


Foil Faced Rockwool RW4 Insulation Slab Features:

 · Aluminium foil faced one side.

 · Non-combustible material.

 · Class A1 fire rated slab.

 · Offers the highest level of fire resistance.

 · Water repellent qualities.

 · Prevents moisture build up.

 · Prevents damp and rot.

 · Excellent thermal insulation.

 · Excellent acoustic properties.

 · Excellent fire performance.

 · Easy to handle, cut and install.

 · Durable insulation solution.

 · Manufactured in density of 80kg/m3.

 · Reducing fire spread and damage.

 · Certified thermal conductivity of 0.034W/mK.

 · Classified as Class ‘0’ to Building Regulations.

 · Suitable for a wide range of building applications.

 · Can be used in ceilings, timber and steel frame walls.

 · Can be used in floors, roofs at rafter level and partitions.

 · Exceeds the minimum requirements of the Approved Document E.

 · Made from natural, sustainable and recyclable resources.

 · Excellent sound absorption characteristics.

 · Provides high levels of sound reduction.

 · Can be easily cut and shaped.

 · 50mm – 69.12m2 per pallet.

 · 75mm – 46.08m2 per pallet.

 · 100mm – 34.56m2 per pallet.

 · Free from CFCs, HCFCs.

 · ODP and GWP free.


Foil Faced Rockwool RW4 80kg/m3 A1 Insulation Slab Installation Guidelines:

 · Required tools: serrated insulation saw and tape measure.

 · Clean and prepare the area for installation.

 · Carry out a pre-work safety check, identifying any potential hazards such as ease of access, work heights, trip hazards, and electrical safety.

 · Check the construction ensuring it is structurally sound and free from defects such as corrosion, splitting, cracking and look for signs of leaks and moisture which can cause rot and mould.

 · Ventilate the area if possible and clear space to hold the insulation, if installing into floors below, or in a loft, use a kneel board and protective knee pads.

 · When installing overhead wear protective eyewear.

 · If installing into spaces higher up, out of reach, it is recommended this is done from a suitable structure such as scaffolding, rather than a step ladder, so that both hands can be used to safely fit the insulation.

 · Assemble tools such as an insulation saw, tape measure and PPE (personal protective equipment) such as gloves, long sleeves, mask and eye protection when working overhead.

 · Refer to the EURIMA health and safety guidelines for guidance on suitable PPE.

 · Using a tape measure, measure the internal aperture of the frame, rafter or joist you are fitting the insulation into.

 · Note that frame centre measurements (i.e. 400mm or 600mm) include the thickness of the stud or joist, and that they may not always be consistent.

 · It is best to measure the internal aperture accurately to ensure the best possible fit, particularly when installing into older structures.

 · Use an insulation saw, or knife with a serrated blade, for cutting the insulation to size.

 · Do not over cut the insulation.

 · Allow an extra 10mm on both dimensions (width and length) of the insulation, over and above the aperture dimensions.

 · The density and dimensional stability of Rockwool stone wool allows a tight friction fit.

 · It will not require pinning or fixings.

 · To install, simply push the slab in one side of the structure and let the insulation go so it tightly butts into the other side and holds in place.

 · Ensure there are no visible gaps, as this will negatively affect the installed performance.

 · To meet fire, acoustic and thermal regulations cavity barriers must be installed at the interface junction between the steel frame party wall with the external cavity wall.

 · If in doubt in any area, please call Rockwool prior to commencement of work.

 · The mechanical effect of fibres in contact with skin may cause temporary itching.

 · When working in an unventilated area, wear a disposable face mask.

 · Waste should be disposed of according to local regulations.

 · Rinse hands in cold water before washing.

 · Ventilate the working area if possible.

 · Wear goggles when working overhead.

 · Clean area using vacuum equipment.


*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 4.32 m2
Colour Light brown
Density 80kg/m3 
Length 1200mm
Material Stone Wool ǀ Aluminium Foil
Pack Coverage 4.32m2
Pack Quantity 6
Profile Square Edge
R-Value 1.45m2K/W
Thermal Conductivity 0.034W/mK
Thickness 50mm
Width 600mm
Fire Classification Class 'O'
Vapour Resistivity Negligable, Water Repellent
Slab Coverage 0.72m2
Building Regulations Approved Document B
Coverage 4.32m2
Fire performance Euroclass A1 (non-combustible)
Finish Foil faced one side
Quantity 6 slabs per pack
Shipping method Articulated Vehicle ǀ Courier
Applications Walls ǀ Ceilings ǀ Floors ǀ Roofs
Foil faced One Side (FFx1)
ETA Notification Yes
Features RW4 Fire Barrier Slab Foil Faced 1 Side
Manufacturer Rockwool RW4®

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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.
50mm Foil Faced Rockwool RW4 Class A1 Slab (pack of 6)
50mm Foil Faced Rockwool RW4 Class A1 Slab (pack of 6)
£ 275.88