External Wall Insulation Board (1200 x 600 x 100mm)
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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 100mm 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 100mm) is £10.72 from Insulation UK. Prices have increased by 4.1% over the last 17 months.
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Frequently Asked Questions
What coverage does a 1200 x 600 x 100mm external wall insulation board provide?
Each board covers 0.72 square metres (1.2m x 0.6m). You'll need approximately 1.39 boards per square metre when accounting for cutting waste and overlap requirements.
What R-value does 100mm external wall insulation board provide?
The R-value depends on the material - polystyrene boards typically provide R-2.5 to R-2.8, while mineral wool boards offer R-2.5 to R-3.0. This thickness significantly reduces heat loss and improves energy efficiency.
Can I install 100mm external wall insulation boards myself?
While possible, external wall insulation requires specific skills including proper adhesive application, mechanical fixing, and weatherproofing. Professional installation is recommended to ensure thermal performance and weather resistance.
What's the difference between polystyrene and mineral wool external insulation boards?
Polystyrene boards offer better moisture resistance and are lighter, while mineral wool provides superior fire resistance and acoustic performance. Both materials offer similar thermal insulation properties at 100mm thickness.
How many fixings do I need per external wall insulation board?
Typically 6-8 mechanical fixings per board are required, depending on wall height and exposure conditions. Additional fixings may be needed for areas subject to high wind loads or on upper floors.