Verified by manufacturer 7 days ago
A rock mineral wool insulation slab with the highest mechanical performance in the range, developed for flat roof insulation in mechanically-fixed applications onto all types of roof deck.
Rocksilk® Flat Roof Slabs are used for the thermal insulation of flat roofs.
Rocksilk® Flat Roof Slabs are suitable for use under all kinds of single ply membrane, hot applied bitumen systems and mastic asphalt and are suitable for maintenance foot traffic only.
Rocksilk® Flat Roof Slabs are suitable for use as an upstand board in warm roof applications when installed with the fixings and waterproof layer as detailed by the membrane manufacturer.
Knauf Insulation Rocksilk® Flat Roof Slab Extra is a rock mineral wool insulation slab with the highest mechanical performance in the range, developed for flat roof insulation in mechanically-fixed applications onto all types of roof deck.
It is non-combustible with the best possible Euroclass A1 reaction to fire classification, and is manufactured using Knauf Insulation's Krimpact® Technology.
Features and benefits:
Standards and Certification:
Rocksilk® Flat Roof Slabs have been assessed by the British Board of Agrément (BBA) under Certificate 08/4526 for use as a thermal insulation layer on limited access flat roofs with concrete, timber or metal decks. The certification offers contractors and specifiers utmost confidence that Rocksilk® Flat Roof Slabs are fit for their intended use and will have a life equivalent to that of the roof structure in which it is incorporated, provided that it is stored and installed correctly. Rocksilk® Flat Roof Slabs are manufactured in accordance with BS EN 13162, ISO 50001 Energy Management Systems, ISO 14001 Environmental Management Systems, and ISO 9001 Quality Management Systems, as certified by TÜV Nord.
Glass and Rock Mineral Wool are easier to install correctly than other insulants such as rigid boards because they adapt to any slight imperfections in the substrate and knit together, eliminating any air gaps. Evidence shows the absence of air gaps is crucial to achieving real performance in the relevant application.
Rocksilk® Flat Roof Slabs contain no ozone-depleting substances or greenhouse gases. For further environmental information consult the relevant Environmental Product Declaration, available on our website.
The physical and chemical characteristics of the fibres are unaltered by wetting. Therefore the thermal properties of Rocksilk® RainScreen Slab are not affected by exposure to moisture and the product will perform as expected once dry.
Handling and storage:
Rocksilk® Flat Roof Slabs are easy to handle and install, being lightweight and easily cut to size, where necessary. Rocksilk® Flat Roof Slabs are supplied loose on a hooded (4-LDPE) pallet which is designed for short term protection only. For longer term protection on site, the product should either be stored indoors, or under cover and off the ground. Rocksilk® Flat Roof Slabs should not be left permanently exposed to the elements.
Rock mineral wool
J42/425 Mineral wool (MW) insulation
J42/27 Thermal insulation
J42/23 Mineral wool insulation boards
To BS EN 13162.
BBA Certificate 08_4526 Rocksilk Krimpact Flat Roof Slab.
Thermal conductivity (maximum)
Euroclass A1 to BS EN 13501-1.
Short term water absorption, WS: <1kg/m2, Tested in accordance with BS EN 1609.
Tested in accordance with BS EN 1603, stable.
Compressive strength (mean value)
Concrete, Metal, Timber, Plywood; OSB.
Refer to manufacturer for fixing details.
Rainfall 37-45.6LiA dB, Airbourne 39-52Rw dB.
Refer to manufacturer for guidance.
Approval Identification: 0003063483/ RR229016.
Environmental Product Declaration (EPD)
In accordance with BS EN 15804+A2.
Green guide rating
Calculations should be created using 2D or 3D modelling programs which comply with the methodologies detailed in BS EN ISO 10211.
Odourless, rot proof, non-hygroscopic, do not sustain vermin and will not encourage the growth of fungi, mould or bacteria.
The product will have a life equivalent to that of the wall structure in which it is incorporated.
Country of material origin
Country of product manufacture
A1-A3 (production stage) as defined in BS EN 15804
26.9 kg CO₂ eq/kg
1m² of Rock Mineral Wool Rocksilk® Flat Roof Slab Extra with a thickness of 105 mm with R value of 2.69 m2K/W.
Mineral wool products from Knauf Insulation can be and in some cases are partly recycled at their end of-life, please contact supplier for more information.
NBS BIM object standard
This BIM object has been authored to meet the requirements of the NBS BIM object standard.
Find out more about the NBS BIM object standard.
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