Certificates and Standards
Rocksilk® Flexible Slab
- Single slab can be used for multiple applications.
- Tested to achieve up to 60 minutes fire resistance when used in the floor of a loft conversion.
- Engineered to adapt to minor imperfections in the substrates and friction fits between studs, joists and rafters.
- Enables existing ceilings to be retained on a loft upgrade whilst meeting building regulations.
Applications
Rocksilk® Flexible SlabRock Mineral Wool
Description & Details
Rocksilk® Flexible Slab is a rock mineral wool slab, designed for use in multiple thermal and acoustic applications as well as the fire protection of a loft conversion floor. It is non-combustible with the best possible Euroclass A1 reaction to fire classification, and is manufactured using our unique bio-based binder, ECOSE® Technology.
- Single slab can be used for multiple applications.
- Tested to achieve up to 60 minutes fire resistance when used in the floor of a loft conversion.
- Engineered to adapt to minor imperfections in the substrates and friction fits between studs, joists and rafters.
- Enables existing ceilings to be retained on a loft upgrade whilst meeting building regulations.
- Manufactured from mineral wool which provides the best levels of sound absorption and reduction compared to other mainstream insulants.
Multi-Application
Ground floors
Internal floors
Separating floors
Pitched roofs at rafter level
Internal walls / partitions
Light steel frame walls
Timber frame walls
Documents
EN
| Product Data Sheet | ||
|---|---|---|
Rocksilk® Flexible Slab Datasheet.PDF /
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990.00 KB /
5 pages | ||
| Brochure | ||
|---|---|---|
Acoustic Insulation - What You Need to Know.PDF /
Jan 2025 /
3.47 MB /
3 pages | ||
Knauf Insulation Solutions Guide UK.PDF /
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29.26 MB /
167 pages | ||
| Manual | ||
|---|---|---|
Knauf Insulation One Hour Floor Upgrade Leaflet.PDF /
Jan 2025 /
2.21 MB /
2 pages | ||
Knauf Insulation Fire Protection Guide Loft Floor Refurb.PDF /
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2.97 MB /
4 pages | ||
| Safety Data Sheet | ||
|---|---|---|
Rock Mineral Wool with ECOSE® Technology - Safety Data Sheet.PDF /
Sep 2023 /
240.00 KB /
8 pages | ||
| Environmental Product Declaration | ||
|---|---|---|
Knauf Insulation Rocksilk Flexible Slab EPD S-P-03832.PDF /
May 2021 /
1.26 MB /
16 pages | ||
| Sustainability | ||
|---|---|---|
Rock Mineral Wool - BREEAM Helpsheet.PDF /
Feb 2025 /
40.00 KB /
1 page | ||
Declaration of Performance
- Declaration of performance: R4208JPCPR
- Declarations of performance (DoPs), safety data sheets (SDS), and environmental product declarations (EPD) for our offered products can be found via a central Knauf Insulation database.
Technical Data
| Description | Value | Unit | Norm |
|---|---|---|---|
Thermal conductivity declared | 0.037 | W/(mK) | |
Reaction to fire | A1 | EN 13501-1 |
Product Variants & Packaging
Rocksilk® Flexible Slab
| Material number | EAN / GTIN | Thickness | Width | Length | Pieces per pack | m2 per pack | Pieces per pallet | Packs per pallet | m² per pallet |
|---|---|---|---|---|---|---|---|---|---|
531594 | 5012061956344 | 40 mm | 600 mm | 1,200 mm | 14 pc/pac | 10.08 m²/pac | 168 pc/pal | 12 pac/pal | 120.96 m²/pal |
457995 | 5012061902136 | 50 mm | 600 mm | 1,200 mm | 12 pc/pac | 8.64 m²/pac | 144 pc/pal | 12 pac/pal | 103.68 m²/pal |
457996 | 5012061902167 | 60 mm | 600 mm | 1,200 mm | 10 pc/pac | 7.20 m²/pac | 120 pc/pal | 12 pac/pal | 86.40 m²/pal |
2411408 | 5012061827200 | 70 mm | 600 mm | 1,200 mm | 8 pc/pac | 5.76 m²/pac | 96 pc/pal | 12 pac/pal | 69.12 m²/pal |
457997 | 5012061902198 | 90 mm | 600 mm | 1,200 mm | 6 pc/pac | 4.32 m²/pac | 72 pc/pal | 12 pac/pal | 51.84 m²/pal |
457994 | 5012061902105 | 100 mm | 600 mm | 1,200 mm | 6 pc/pac | 4.32 m²/pac | 72 pc/pal | 12 pac/pal | 51.84 m²/pal |
2411335 | 5012061826647 | 140 mm | 600 mm | 1,200 mm | 3 pc/pac | 2.16 m²/pac | 36 pc/pal | 12 pac/pal | 25.92 m²/pal |