Mineral Wool EWI Slabs
Non-combustible stone wool insulation slabs for Licata external wall insulation systems, in dual density and high density grades. 1200 x 600 mm, thicknesses from 30 mm to 250 mm.
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Stone wool insulation for render and brick slip EWI systems
Made from volcanic rock spun into fibres, stone wool gives a rigid, dimensionally stable slab that does not burn, lets water vapour pass through and resists water penetration. Supplied in two grades: the dual density slab for standard render and brick slip systems on masonry and framed substrates, and the high density slab where a firmer board is specified. Both are fixed with Licata adhesive and mechanical fixings as part of a certified Licata EWI build-up.
Non-combustible
The slab achieves Euroclass A1, the highest reaction-to-fire class. The classification of the full wall build-up is confirmed by the relevant Licata system certificate.
Dense Outer Face
A firm, even surface for the reinforced base coat that also resists over-driven fixings.
Vapour Open
Vapour resistance close to still air, with water-repellent fibres that keep liquid water out. Suited to breathable systems on solid-wall refurbishment.
Continuous Insulation
Tightly butted slabs knit together into an unbroken insulating layer, cutting heat loss through gaps.
Acoustic Improvement
Test evidence shows up to 8 dB improvement in weighted sound reduction, depending on the substrate.
Easy to Install
Standard 1200 x 600 mm format, cut with a hand saw, laid in brick bond. Thicknesses over 250 mm are built up in two layers.
Two grades to suit the system
Dual Density (DD) Slab
The standard EWI slab. A denser outer layer gives a solid face for the base coat, while the softer underside takes up unevenness in the substrate. The outer face is marked THIS SIDE UP.
| Reaction to fire | Euroclass A1 |
| Thermal conductivity | 0.036 W/mK |
| Tensile strength | ≥ 10 kPa |
| Compressive strength | ≥ 10 kPa |
| Size | 1200 x 600 mm |
| Thickness | 50 to 250 mm (10 mm steps) |
High Density (HD) Slab
For external wall insulation systems where a higher density board is required.
| Reaction to fire | Euroclass A1 |
| Thermal conductivity | 0.038 W/mK (30 to 40 mm) 0.039 W/mK (over 40 mm) |
| Tensile strength | ≥ 15 kPa |
| Compressive strength | ≥ 10 kPa |
| Size | 1200 x 600 mm |
| Thickness | 30 to 200 mm (10 mm steps) |
Dual density slab thickness by target U-value
Indicative thicknesses for two typical substrates. Ask the Licata technical team for a project-specific U-value calculation.
| U-value (W/m²K) | New build steel frame DD slab (mm) | Refurbishment 215 mm block DD slab (mm) |
|---|---|---|
| 0.30 | 50 | 110 |
| 0.28 | 60 | 120 |
| 0.26 | 70 | 130 |
| 0.24 | 80 | 140 |
| 0.22 | 90 | 150 |
| 0.20 | 100 | 170 |
| 0.18 | 120 | 190 |
| 0.16 | 140 | 210 |
Steel frame: 12 mm cement particle board, 100 mm steel frame fully filled with mineral wool, 2 x 12.5 mm plasterboard. Block: 215 mm dense concrete block, 13 mm plaster. Full table in the technical data sheet.
Specify mineral wool EWI slabs
Technical data sheet, U-value calculations, fixing calculations and system certificates from the Licata technical team.