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40mm Black Tissue Faced One Side Rocksilk RS60 Slab (pack of 12)

40mm Black Tissue Faced One Side Rocksilk RS60 Slab (pack of 12)
40mm Black Tissue Faced One Side Rocksilk RS60 Slab (pack of 12)
40mm Black Tissue Faced One Side Rocksilk RS60 Slab (pack of 12)
40mm Black Tissue Faced One Side Rocksilk RS60 Slab (pack of 12)
40mm Black Tissue Faced One Side Rocksilk RS60 Slab (pack of 12)
  • Black Tissue Faced Knauf Rocksilk RS60 Insulation Slab A1 (40mm)
  • Density 60kg/m3 Thermal conductivity (lambda) of 0.034W/mK
  • Class A1 Non-combustible Rock Mineral Wool Insulation Slab
  • Provides from 30 minutes up to 240 minutes fire protection
  • Used for structural elements such as concrete car park soffits
Estimated delivery:
In Stock
£ 320.63
Ex VAT: £ 267.19
  • Brand: Knauf®
  • Model: 40mm RS60 Black Tissue x1
  • Weight: 18.41kg
  • Dimensions: 1,200mm x 600mm x 40mm
  • SKU: 40mm RS60 Black Tissue x1
  • Product code: P1-2884
  • MPN: 40mm RS60 Black Tissue x1

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40mm Black Tissue Faced One Side Rocksilk RS60 (60kg) Slab is a soffit insulation slab, an A1 class rock mineral wool core faced with black tissue on one side, used for roofs, concrete car park soffits and similar applications.

Knauf Rocksilk RS60 is a medium density (60kg/m3) insulation slab with a certified lambda value (thermal conductivity) of 0.034 W/mK and excellent sound absorption characteristics providing high levels of sound reduction.

Black tissue facing on 1 side helps to avoid the slab edges from showing as shadows through the perforated inner sheet and assists in preventing fibre migration, providing approx. four times less fibre migration-bullet.

The 40mm x 600mm x 1200mm Knauf Rocksilk RS60 Soffit Insulation Slab faced with black tissue on one side can provide from 30 minutes up to 240 minutes fire protection to the underside of concrete soffits.

Rocksilk RS60 Soffit Linerboard 40mm is non-combustible with the best possible Euroclass A1 reaction to fire classification, and is manufactured using Knauf Insulation's unique bio-based binder, ECOSE® Technology.

Knauf Rocksilk RS60 Black Tissue Faced 1 Side Insulation Slabs are used for the thermal, fire and acoustic insulation of soffits in a wide range of both residential and non-residential buildings.

This special Black Tissue Faced on One Side Knauf Rocksilk RS60 Insulation Slab is suitable for use as an insulated underlining solution in structural soffits such as underground car parks.

Rocksilk RS60 Black Tissue Faced 1 Side Soffit Slabs are odourless, rot proof, non-hygroscopic, do not sustain vermin and will not encourage the growth of fungi, mould or bacteria.

Achieved absorption coefficient of the product will vary according to thickness and density of the slab and application where it is used.

Black Tissue Faced Knauf RS60 (60kg) will have a life equivalent to that of the structure in which it is incorporated.

Knauf Insulation products made with ECOSE Technology contain no formaldehyde binder, dye or artificial colours.




Thickness: 40mm

Width: 600mm

Length: 1200mm

Pack Quantity: 12

Slab Coverage: 0.72m2

Pack Coverage: 8.64m2

Finish: Black Tissue Faced

Density: 60kg/m3

R-Value: 1.15m2K/W

Thermal Conductivity: 0.034W/mK

Vapour Resistivity: Negligable, Water Repellent

Building Regulations: Class ‘O’ 

Fire performance: Euroclass A1 (non-combustible)


Black Tissue Faced Knauf RS60 Insulation Slab Features:

 · Medium Density 60kg/m3.

 · Highest fire rating for non-combustible material.

 · Euroclass A1 Fire classification.

 · Black Tissue Faced 1 Side Slab.

 · Formaldehyde binder free.

 · Providing high levels of sound reduction.

 · Acoustic, Fire and Thermal insulation slab.

 · Excellent thermal performance.

 · Non-combustible material.

 · A+ BRE Green Guide rating.

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

 · Free from CFCs, HCFCs.

 · Standard slab size 1200mm x 600mm.

 · Odorless, non-hygroscopic, and rot proof product.

 · Easy to handle and install.

 · Available in a wide range of densities.

 · Free of dye or artificial colours.

 · Can provide from 30 up to 240 minutes fire protection.

 · Providing approx. four times less fibre migration-bullet.

 · Excellent sound absorption characteristics.

 · Provide high levels of sound reduction.

 · Manufactured using revolutionary Knauf ECOSE® Technology.


Knauf RS60 (60kg/m3) Black Tissue Faced One Side Installation Guide:

 · When fixing a tile or modular system, it is advisable to start with a focus reference slab in the centre of the soffit with subsequent slabs being fixed working towards each edge.

 · The use of string lines or laser alignment equipment will assist in ensuring alignment and squareness of the installation.

 · If installed into concrete or steel composite deck, a pilot hold should first be drilled prior to the fixing being screwed into place.

 · Knauf RS60 Soffit Slabs should be fixed directly to the concrete soffit using Ejot DDS fixings with the Ejot DDT70 washer or similar.

 · Care should be taken not to over-tighten fixings to prevent damage to the Knauf Rocksilk RS60 slab surface.

 · For further information on fixing type and suitability for the substrate, please refer to the fixing manufacturer.

 · It is recommended that all board joints should be staggered and tightly butt jointed.

 · Soffit insulation products should not be used for supporting light fittings or services.

 · Such installations should be supported from the concrete soffit.

 · Where penetrations occur, the boards should be cut locally to ensure a tight fit around the penetration.

 · RS60 Insulation Slabs can be cut slightly oversized to ensure a tight fit under slight compression around the penetration.

 · Any small gaps that result from cutting can be infilled using the Acoustic Intumescent Sealant.


RS60 Slab Black Tissue Faced 1 Side Safety:

 · Knauf Rocksilk RS60 Soffit Liner Slabs (Boards) are easy to handle.

 · Care should be exercised to avoid crushing the edges or corners.

 · Damaged, contaminated or wet products must not be used.

 · During construction exposed areas of slabs should always be covered at the end of a day’s work or in heavy rain.

 · Polyethylene covers should be used to provide protection and prevent work from becoming saturated.

 · It is recommended that the Personal Protective Equipment (PPE) should be used while handling the product.

 · Dust mask (FFP1 minimum), gloves, safety glasses.

 · Knife or fine-toothed saw, tape measure.

 · It is recommended that dust masks, gloves and long-sleeved clothing should be worn during cutting and handling of the product.


*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 8.64 m2
Colour Dark brown ǀ Black
Density 60kg/m3 
Fire Protection (Resistance to Fire) from 30 up to 240 minutes
Length 1200mm
Material Rock Mineral Wool ǀ Black Tissue
Pack Coverage 8.64m2
Pack Quantity 12 slabs
Profile Square Edge
R-Value 1.15m2K/W
Size 40mm x 600mm x 1200mm
Thermal Conductivity 0.034W/mK
Thickness 40mm
Weight/m2 2.13kg
Width 600mm
Fire Classification Class 'O'
Vapour Resistivity Negligable, Water Repellent Slab
Slab Coverage 0.72m2
Building Regulations Approved Document B
Black Tissue Faced Yes, One Side
Coverage 8.64m2
Fire performance Euroclass A1 (non-combustible)
Finish Black Tissue Faced 1 Side ǀ Unfaced (Plain)
Quantity 12 slabs per pack
Durability Insulation slab should last the lifetime of your building
Shipping method Articulated Vehicle ǀ Courier
Grade Rigid Insulation Slab 60kg/m3
Sound insulation reduction Up to a factor of eight
Applications Structural elements such as concrete car park soffits
ECOSE Technology Yes, ECOSE® (unique bio-based binder)
ETA Notification Yes
Features Assists in preventing fibre migration
Manufacturer Knauf Rocksilk RS60®

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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.
40mm Black Tissue Faced One Side Rocksilk RS60 Slab (pack of 12)
40mm Black Tissue Faced One Side Rocksilk RS60 Slab (pack of 12)
£ 320.63