External Wall Insulation

External wall insulation (EWI) wraps the outside of a building in insulation boards, which are then finished with a render system. It cuts heat loss without taking any room space from inside, so it suits solid-walled homes from Victorian terraces to post-war semis.

This range covers two board types. Graphite EPS boards (20–100mm) are light, easy to cut and a cost-effective way to reach a target U-value. Kingspan Kooltherm K5 phenolic boards (25–70mm) give a much thinner build-up where reveals, eaves or boundaries are tight. All EWI boards are sold as full packs, and each product page shows the pack size and coverage.

Free delivery from £400 ex VAT, England & Wales. Questions about thickness or quantities? Call 03330 908479.