External Wall Insulation Board (1200 x 600 x 50mm)
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Product Details
External Wall Insulation Board is a rigid insulation panel used to improve a home's thermal efficiency by applying it to exterior walls. These 1200 x 600 x 50mm boards are typically made from materials like Rockwool or polystyrene, providing excellent sound and heat insulation properties while helping reduce energy bills. The boards are secured to external walls using special adhesives and mechanical fixings in a brick-pattern layout, creating a continuous insulation layer that eliminates cold spots and thermal bridging. Once installed and properly secured, these boards serve as the foundation for a render system that gives your home a fresh appearance while significantly improving its energy performance.
As of August 2026, PriceNailer data confirms that the cheapest price for External Wall Insulation Board (1200 x 600 x 50mm) is £5.36 from Insulation UK across 5 suppliers. Prices have increased by 25.8% over the last 9 months.
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Frequently Asked Questions
How many External Wall Insulation Boards do I need per square metre?
Each 1200 x 600mm board covers 0.72 square metres, so you'll need approximately 1.39 boards per square metre. Always add 5-10% extra for cutting waste and future repairs.
What R-value does a 50mm External Wall Insulation Board provide?
A 50mm board typically provides an R-value of 1.25-1.85 m²K/W depending on the material (higher for PIR/polyurethane, lower for EPS). This significantly improves your wall's thermal performance and helps meet building regulations.
Can External Wall Insulation Boards be installed on all wall types?
These boards work best on solid masonry walls including brick, block, and concrete. They're not suitable for timber frame construction or walls with structural movement issues without specialist assessment.
What adhesive and fixings do I need for External Wall Insulation Boards?
You'll need EWI-specific adhesive (typically 4-6kg per m²) and mechanical fixings like screw-in anchors or hammer-in fixings (5-8 fixings per board). The exact specification depends on your wall type and wind exposure.
Do External Wall Insulation Boards require planning permission?
Most EWI installations fall under permitted development rights, but check with your local authority first. Listed buildings and conservation areas typically require planning permission or listed building consent.