Insulation Boards EPS & XPS — Lightweight Thermal Performance for EWI

Our insulation boards provide dependable thermal performance for external wall insulation (EWI) across refurbishments and new builds. Moreover, this range covers graphite EPS insulation boards for high efficiency and robust XPS insulation boards for moisture‑resistant, high‑strength applications. Therefore, you can select precise thicknesses and formats to hit U‑value targets and speed up site installation. In addition, for plinths and DPC lines we also stock 100×50 XPS boards for neat detailing and high compressive strength.

EPS vs XPS — when to choose each

Firstly, graphite EPS delivers excellent lambda values (for example 0.031 W/mK) in a lightweight, easy‑to‑cut board that suits most façades; see EPS 20 mm, EPS 30 mm, EPS 50 mm, EPS 80 mm and EPS 90 mm. Secondly, XPS foundation boards resist water uptake and compressive loads around DPC/plinths; choose XPS 30 mm (100×50 cm), XPS 50 mm (100×50 cm), XPS 90 mm (100×50 cm) or XPS 100 mm (100×50 cm). Finally, both options integrate cleanly with approved EWI mortars for a durable, vapour‑managed façade build‑up.

Formats, thicknesses and handling

Typically, EPS boards cover large areas fast thanks to low weight and straightforward cutting, while XPS panels in 100×50 cm format simplify plinth detailing. In addition, stepped thickness selection (20–100 mm) lets you meet project‑specific U‑values without over‑specifying adhesives or fixings. Consequently, installers can balance performance, budget and programme with confidence.

System integration for long‑term performance

For reliability, pair the external wall insulation boards with compatible system components. Specifically, use adhesives & basecoats for fixing and mesh embedding, reinforce with fibreglass mesh, then prime with wall primers before finishing in your chosen render system. Therefore, the complete EWI build‑up remains impact‑resistant, dimensionally stable and ready for UK weather.

Applications and planning guidance

Use graphite EPS across typical façades for the best cost‑to‑performance ratio, and specify XPS at splash zones, DPC lines and high‑impact plinths. Moreover, plan thickness early to coordinate reveals, sills and fixings; see What Is External Wall Insulation? and How Thick Should External Wall Insulation Be? for context. Finally, confirm substrate readiness and exposure class before ordering to streamline installation.

Popular insulation boards

• Graphite EPS Board — 20 mm
• Graphite EPS Board — 30 mm
• Graphite EPS Board — 50 mm
• Graphite EPS Board — 80 mm
• Graphite EPS Board — 90 mm
• XPS Foundation Board — 30 mm (100×50 cm)
• XPS Foundation Board — 50 mm (100×50 cm)
• XPS Foundation Board — 90 mm (100×50 cm)
• XPS Foundation Board — 100 mm (100×50 cm)

Expert support and UK‑wide delivery

Need help selecting thicknesses, fixings or compatible mortars? Our team can size external wall insulation boards for target U‑values, advise on EPS vs XPS plinth detailing and coordinate reliable UK delivery. In addition, every order includes access to system guidance so crews can move from substrate prep to finished façade efficiently.