EPS Insulation Boards UK – High-Performance Expanded Polystyrene for EWI Systems

Renders World is a leading UK supplier of premium EPS insulation boards, specifically engineered for External Wall Insulation (EWI) and professional construction applications. Our range features high-density graphite EPS boards (Grey Polystyrene) with a superior thermal conductivity of 0.031 - 0.032 W/mK, providing up to 20% better thermal performance than standard white EPS. Available in thicknesses from 10mm to 200mm, our expanded polystyrene insulation is the professional choice for achieving Part L 2025 compliance in both domestic and commercial retrofits.

Thermal Performance & Part L Compliance

In response to the updated UK Building Regulations, choosing the correct eps thermal insulation UK is critical. Our graphite-enhanced boards reflect radiant heat, significantly reducing the thickness required to achieve target U-values. Below is a reference for thermal resistance (R-Values) across our core range:

System Compatibility & Durability

• Fully Certified: Our boards are manufactured to EN 13163 standards and are compatible with BBA/ETA certified systems.
• Adhesive Ready: Perfect for use with Ceresit ZU, Atlas Hoter U, and CT84 adhesive foams.
• Biological Resistance: Naturally resistant to fungi, mould, and bacteria, ensuring no decomposition within the wall cavity.
• Fire Safety: Classified as Euroclass E (Self-extinguishing), suitable for residential properties under 11m/18m (refer to local building control).

Why Source EPS from Renders World?

As an official UK distributor, we provide eps board solid wall insulation at trade prices with nationwide next-day delivery on 98% of in-stock orders. Whether you are insulating a timber-frame extension or a masonry renovation, our EPS boards provide the dimensional stability and compressive strength (70kPa) required for a long-lasting, crack-resistant render finish.

For detailed installation techniques and U-value calculations, please visit our EPS Insulation Boards Ultimate Guide 2025 or browse our compatible insulation fixings and base tracks.

Frequently Asked Questions

Can I use Graphite EPS for floor insulation?

Yes, due to its high compressive strength, our EPS boards are ideal for floor insulation under screed, provided the load requirements meet the 70kPa specification.

What is the difference between EPS and XPS?

While EPS is the standard for breathable wall insulation, XPS (Extruded Polystyrene) is denser and more water-resistant, making it better suited for below-DPC (foundation) applications.