Rockwool External Wall Dual Density Slab 1200 x 600 x 80mm | EWI Insulation Board

The Rockwool Dual Density Slab (1200 x 600 x 80mm) is a high-performance stone wool insulation board specifically engineered for use in external wall insulation (EWI) systems. Designed with two layers of density — a tougher outer surface and a softer inner layer — it offers outstanding thermal performance, acoustic insulation, and fire resistance for rendered facade systems.

✅ Dual density construction – rigid outer layer resists impact and improves fixings
✅ Designed for EWI systems with thin coat or dash render finishes
✅ Excellent thermal conductivity: 0.036 W/mK
✅ Euroclass A1 non-combustible fire rating
✅ Water repellent and vapour permeable – allows buildings to breathe
✅ Size: 1200mm x 600mm x 80mm (0.72m² per slab)

Rockwool slabs are easy to handle, cut, and install with standard fixings and are compatible with a wide range of basecoats, mesh, and render systems including silicone and acrylic finishes.

✔️ Ideal for new builds or retrofit EWI projects
✔️ Reduces energy loss and improves U-values
✔️ UK-wide delivery available in full or mixed pallet quantities