Rockwool External Wall Insulation High Density Slab is a robust stone wool insulation solution, purpose-built for use in external wall insulation (EWI) systems where enhanced mechanical performance is essential. Engineered for areas that demand higher tensile strength, this high density slab offers exceptional durability and thermal performance.
With a Euroclass A1 fire rating in accordance with BS EN 13501-1, the slab is non-combustible, making it ideal for applications requiring the highest level of fire safety. The slab delivers thermal conductivity values of 0.038 W/mK (30–40mm) and 0.039 W/mK (>40mm), helping improve the energy efficiency of the building envelope. It also boasts excellent mechanical properties with ≥15 kPa tensile strength perpendicular to the face and ≥10 kPa compressive strength, ensuring reliable performance in demanding conditions.
Applications
Perfect for use in EWI systems across various building types, especially where increased impact resistance and structural integrity are required.
Thicknesses and Coverage Rates
| 30mm (Pack of 5 Slabs) |
3.66 (m²) |
| 40mm (Pack of 64 Slabs) |
46.08 (m²) |
Technical Data
| Product Type |
Stone Wool (Rock Mineral Wool) |
| Application |
External Wall Insulation Systems |
| Thermal Conductivity (λ) |
0.038 W/mK (30–40mm), 0.039 W/mK (>40mm) |
| R-Value |
30mm: 0.79 m²K/W, 40mm: 1.05 m²K/W |
| Fire Classification |
Euroclass A1 (EN 13501-1) – Non-combustible |
| Tensile Strength |
≥ 15 kPa |
| Compressive Strength |
≥ 10 kPa |
| Water Vapour Resistance (μ) |
Typically < 1 (highly breathable) |
| Moisture Resistance |
Water repellent |
| Density |
Approx. 120–150 kg/m³ |
| Slab Dimensions |
1200mm x 600mm |
| Thickness Range |
30mm – 40mm |
| Weight |
Approx. 2.2–3.6 kg per slab (based on 50mm) |
| Facing |
No Facing |
| Product Standard |
EN 13162:2012+A1:2015 |
| Declaration of Performance (DoP) |
UK-WER-0130 |
| CE Certificate Number |
0751-CPR-393.0-01 |
| Compatibility |
Suitable with EWI systems using mechanical fixings and render finishes |
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For external wall insulation works, EWI Pro strongly recommends obtaining a full EWI Pro system specification, particularly where warranties or compliance are required.
Individual products purchased without an EWI Pro system design do not constitute a warranted EWI system.
Insulation products may be used independently for repairs, maintenance, flooring, or other non-EWI applications.
