External Wall Insulation (EWI)

External Wall Insulation (EWI)

Boost Energy Efficiency & Transform the Look of Your Home

At CorkRend, we offer premium External Wall Insulation (EWI) systems designed to dramatically improve the thermal performance, weather resistance, and visual appeal of your property. Whether you’re looking to reduce your heating bills or give your home a fresh, modern finish, our EWI solutions are tailored to deliver long-term benefits with a stylish edge.

Choose from a Silicone Render or Corksol Spray Cork topcoat, both high-performance finishes that combine durability with aesthetic flexibility.

What Is an External Wall Insulation (EWI) System?

EWI involves fixing insulation boards to the outside of your home, then applying a reinforced render system over the top. This improves the building’s energy efficiency by reducing heat loss through the external walls, while providing a weatherproof, low-maintenance finish that upgrades the appearance of your home.

Transform Your Property with EWI

Boost your property’s energy efficiency, weather protection, and kerb appeal with our advanced EWI systems finished in spray cork or silicone. Contact CorkRend today to find out more and book your consultation.

Why Homeowners Choose EWI

  • Keep warmth in and cold out, ideal for solid wall or poorly insulated homes.

  • Lower energy bills and improved EPC ratings.

  • Fully transform dated or damaged facades with a fresh, sharp finish.

  • Protects against rain, damp and frost while allowing the walls to breathe.

  • A warmer, healthier indoor environment all year round.

System Breakdown

  • 50–100mm EPS or Mineral Wool Insulation – bonded and mechanically fixed

  • Full Basecoat System with Reinforced Mesh – for strength and crack resistance

  • Primer Coat – ensures an even and durable topcoat

  • Choice of Finish:

    • Silicone Render: Smooth, clean, water-repellent & available in a wide range of colours
    • Spray Cork Finish: Textured, breathable & thermally efficient with natural cork benefits

Your Finish Options

  • Silicone Render Finish

    • Low maintenance and self-cleaning
    • Highly water-repellent and breathable
    • Sleek and contemporary aesthetic
    • Long-lasting colour without painting
  • Spray Cork Finish

    • Natural thermal insulation built into the topcoat
    • Crack-resistant and ultra-flexible
    • Eco-friendly and sustainable cork composition
    • Great acoustic performance and UV resistance
  • Ideal For:

    • Older solid-wall homes with poor insulation
    • Homes with damaged, painted or cracked render
    • Extensions or full façade upgrades
    • Energy-conscious homeowners looking to reduce bills and futureproof their property