Rockwool-470 Mineral Wool – 50mm

£26.81 (incl VAT)

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There are 4 boards in each pack (each board is 600 x 1200mm) so total coverage is 2.88 m2

This 50mm Rockwool Dual Density insulation board is designed for external application. The Rockwool dual density slabs are breathable and non combustible and they also offer unparalleled thermal performance making them the premium choice for external wall insulation works.

Available in several other thicknesses, these 50mm Rockwool boards are specifically designed to survive in exposed environments and under the toughest conditions.


Our 50mm Rockwool dual density insulation slabs are a brilliant, hard-wearing insulating material.

The Rockwool dual density slab is made up of two different density layers of wool – the outer layer is denser giving a firmer surface on which to apply the basecoat and render. These Rockwool external wall insulation boards require metal pin mechanical fixings as well as adhesive to tie them to the wall (a minimum of 5.5 fixings are required per m2).

Why use Rockwool Dual density insulation boards?

Rockwool not only improves the thermal comfort of buildings, it also helps to reduce noise within the building. Another benefit of Rockwool dual density insulation boards is that they are non-combustible – Non-combustible Rockwool insulation acts like fire barrier and does not contribute to fire. Finally Rockwool is also breathable, making it the insulation material of choice for Architects and builders alike.

Technical Specifications of Rockwool:

  • Composition: mineral wool
  • Thermal Conductivity: 0.036W/(m2K)
  • Reaction to Fire: Class A1 (non combustible)
  • Size of boards: 1200mm by 600mm
  • This particular product is 50mm thick (other thicknesses are available – 100mm, 120mm)
  • Coverage in pack: 2.88m2


Use netting on scaffolding as well as protective rainproof covering to reduce exposure to elements such as rain and excess sunlight.


Rockwool insulation slabs should be installed in accordance with the manufacturer’s instructions – these includes guidelines on design and other aspects of application. We recommend the boards are fixed to the substrate with mortar/adhesive and mechanical fixings to ensure maximum adhesion.

Because of the greater weight of mineral wool we advise that you use the EWI-225 Premium MW Adhesive for the application rather than a standard adhesive, which is used on lighter insulating materials. Apply a light, watery based coat of the adhesive to your prepared surface initially. When it is dry, apply the basecoat, then sink in the fibre glass mesh.


Use an industrial hoover to clean-up the mineral wool fibres.


The Mineral wool comes in packs of 4 sheets in 600mmx1200mm slabs


Shelf life: please see the manufacturer’s date of expiry. Keep in a dry place, in the original undamaged packaging, avoid excess heat or UV light exposure.

Safety Measures:

Wear eye protection, gloves and a mask. Take extra caution when using cutting equipment.

Compliance with Standards:

The product complies with BS EN 13162, ISO 14001:2004, LPCB 022e

SKU: ROCK-470-50
Weight 139 kg


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