Last updated on 14th January 2026 by ProGuard Exteriors

External wall insulation systems need care over time. Cork spray render is now the preferred upgrade choice for many EWI refurbishment projects in Oxfordshire.

At ProGuard Exteriors, we help homeowners in Oxford, Abingdon, Witney, Headington, and surrounding areas extend the life and performance of their EWI systems by applying modern cork spray render. This breathable, flexible coating not only restores tired finishes but improves insulation, durability, and moisture control.

Why Refurbish EWI with Cork Spray Render

Traditional EWI systems can show wear over time. Cracks, fading, moisture ingress, and rigid surfaces are common issues. Cork spray render provides a seamless, flexible coating that can be applied directly over existing insulation without the need for full removal.

Bonds to render, masonry, or previous coatings

Adds weatherproofing and UV resistance

Helps maintain thermal performance

Breathability and Crack Resistance

Unlike traditional acrylic or cement-based renders, cork spray is fully breathable and highly elastic. It allows water vapour to escape while resisting surface cracks caused by movement or thermal change. This makes it especially valuable on older properties or walls that have previously experienced damp or expansion stress.

Low Maintenance and Long-Term Durability

With natural resistance to algae, UV degradation, and cracking, cork spray render requires far less maintenance than conventional render systems. Most homes benefit from a refreshed appearance and increased protection for many years, backed by manufacturer warranties when applied professionally.

Sustainable and Efficient

Cork is a renewable, non-toxic material harvested without harming the trees it comes from. When used in render, it improves insulation, supports indoor air quality, and reduces long-term environmental impact compared to synthetic or cementitious systems.

Local Spray Cork Experts in Oxfordshire

ProGuard Exteriors are certified cork spray applicators serving Oxford, Boars Hill, Cumnor, Eynsham, Headington, Kennington, Radley, Wheatley, Witney and surrounding areas. We offer fast, clean installation and surface preparation for all EWI refurbishments and upgrades.

Full surveys of existing EWI systems

Expert remedial repair and preparation work

Spray application and long-lasting finishes

If your existing EWI system is showing signs of ageing or damage, contact ProGuard Exteriors today. We will provide a free site visit and quote for upgrading with sustainable, breathable cork spray render.