Last updated on 14th January 2026 by ProGuard Exteriors

Many homes across Oxfordshire feature solid walls or heritage construction. For these properties, breathable insulation is essential to preserve character and prevent damp.

Cork spray systems can be applied to both internal and external wall surfaces, subject to the suitability of the existing substrate, property construction, product specification and any applicable regulatory or planning requirements.

At ProGuard Exteriors, we specialise in cork-based insulation systems that allow walls to breathe while still improving thermal comfort. Our spray-applied cork coatings are ideal for older homes where thick insulation boards or vapour barriers are unsuitable.

Whether you live in Oxford, Headington, Witney, Abingdon, or surrounding areas, our breathable solution helps reduce heat loss, regulate moisture, and maintain the health of traditional building materials.

Why Breathability Matters in Solid Walls

Solid brick or stone walls were built to allow moisture to move in and out freely. When sealed with non-breathable insulation, this moisture becomes trapped, leading to condensation, black mould, and deterioration of internal finishes.

Cork insulation allows vapour to escape naturally

Helps prevent internal damp and protects wall integrity

Ideal for Listed and Heritage Properties

Listed homes and buildings in conservation areas often face restrictions on external alterations. Our internal cork system allows you to insulate discreetly while preserving historic features.

No structural changes required

Suitable for lime plaster and other traditional finishes

Ultra thin build up preserves internal space

Thermal and Acoustic Performance

Our spray cork solution not only regulates moisture but also improves comfort and efficiency. U-value testing shows a reduction in heat loss of over 30 percent with only a 6 millimetre coating. It also absorbs sound, reducing unwanted noise from the outside.

Where Cork Spray Insulation Works Best

Our breathable internal system is ideal for:

Solid wall cottages and stone houses built before 1930

Curved walls and uneven surfaces

Cold corners and condensation-prone rooms

Regulatory Requirements and Property Suitability

Any external wall insulation, rendering, spray cork or other external refurbishment works must be considered in the context of the property’s construction, location and applicable statutory requirements.

Depending on the nature and extent of the proposed works, Building Regulations requirements may apply, including considerations relating to thermal performance, fire safety, moisture management and ventilation.

Additional permissions or consents may also be necessary for listed buildings, properties within conservation areas or buildings subject to specific planning restrictions.

Requirements can vary depending on the individual property and proposed works, and should be checked with the relevant local authority or appropriate building control body before work commences.

The suitability of any proposed system, materials or installation method is subject to an appropriate assessment of the existing building and site conditions. Responsibility for obtaining any necessary permissions, approvals and professional design input where applicable should be clearly established before works commence.

Any services, specifications, quotations and installation responsibilities undertaken by ProGuard Exteriors will be subject to the agreed project scope and formal written terms.

ProGuard Exteriors Covers All Oxfordshire

We proudly serve homeowners in Oxford, Boars Hill, Cumnor, Eynsham, Headington, Kennington, Radley, Wheatley, Witney and nearby villages. Every project includes a full moisture assessment, expert application, and a finish that is ready for plaster or paint.

If you are looking to insulate your solid or heritage property without trapping moisture, contact ProGuard Exteriors today. We will help you preserve comfort, character, and value with a breathable solution built to last.