Spray Cork Insulation – Natural, High-Performance Thermal & Acoustic Protection
What is Spray Cork Insulation?
Spray Cork Insulation is a revolutionary, sustainable, natural wall and roof coating derived from granulated cork mixed into a specialised sprayed solution. Once applied, it forms a breathable, seamless insulating membrane that delivers thermal efficiency, acoustic comfort, weather protection and long-lasting performance for UK homes and commercial properties.
Unlike traditional insulation boards, foams, or renders, spray cork wraps the building in a continuous layer, eliminating heat loss through cold bridges and dramatically improving energy efficiency without bulky materials.
Why Choose Spray Cork Insulation?
Superior Thermal Performance
Spray cork uses the natural insulating properties of cork to regulate indoor temperatures throughout the year—warm in winter and cool in summer. Its micro-structure traps air and reduces heat transfer, lowering heating bills and improving comfort.
Independent studies and applicator data show spray cork coatings can reduce heat loss through walls by up to 30% and significantly improve U-values even at a thin application (typically 3–8mm).
Exceptional Sound Insulation
Cork insulation isn’t just thermal — its natural structure also absorbs sound. With a Noise Reduction Coefficient (NRC) around 0.7 and up to ~38dB noise reduction, spray cork can quieten traffic noise, reduce room reverberation, and create a more peaceful living environment.
Breathable, Moisture-Controlled & Hygienic
Unlike rigid, vapour-tight materials, cork insulation is vapour-permeable, allowing moisture to escape. This helps prevent condensation build-up, mould, and damp problems, especially in older, solid-walled UK homes.
Weatherproof & Durable Exterior Protection
Applied externally, spray cork acts as a weather-resistant protective coating, handling rain, freeze-thaw cycles, UV exposure, and coastal environments without cracking or delaminating. Its flexibility accommodates natural building movement.
Fire Resistant & Environmentally Responsible
Cork is naturally fire resistant and safe; it does not produce harmful off-gases. As a renewable harvested material, cork has excellent eco-credentials — cork bark regrows without harming trees and supports sustainable forestry.
How Spray Cork Works – Technical Explained
Spray cork consists of tiny cork granules infused with binders, applied via specialist spray rigs to create one continuous insulating membrane. This layer:
- Eliminates thermal bridging by covering the full surface without gaps
- Enhances breathability to support moisture regulation
- Delivers multi-functional performance with very low thickness
- Bonds directly to brick, stone, plasterboard and more surfaces
Compared with conventional insulation (e.g., fibreglass, rigid boards), spray cork offers unique advantages — continuous coverage, moisture control, acoustic performance and sustainability — though traditional materials may require greater thickness for similar thermal resistance
Where Spray Cork Is Used
Internal Wall Insulation
Ideal for retrofit projects or solid-walled homes where insulation space is limited. Spray cork is applied internally to walls and skimmed for decoration, boosting thermal efficiency and reducing noise without bulky panels.
👉 Great for homes, apartments, loft conversions and refurbishment projects.
External Wall Insulation & Coating
Spray cork can be applied externally as a decorative thermal coating that replaces or upgrades traditional render systems. It improves weather resistance while adding insulation, enhancing curb appeal and minimising future maintenance.
👉 Perfect for period properties, heritage homes and coastal buildings.
Sound & Thermal Comfort Upgrades
From townhouses near busy roads to open-plan living spaces, spray cork provides acoustic comfort alongside insulation, making homes calmer and more comfortable.
Asbestos Encapsulation & Protective Membranes
Spray cork can encapsulate asbestos roofing or wall surfaces, providing a sealed protective layer that immobilises hazardous fibres while adding insulation and weatherproofing — an ideal solution for roof and exterior applications where removal is risky.
Why Use Approved Spray Cork Applicators Like Us
As accredited spray cork applicators, we ensure:
✅ Correct substrate preparation
✅ Even, high-performance application
✅ Full warranty-compatible installation
✅ Professional finish and long-term performance
We specialise in internal wall insulation, external wall insulation & protective coatings, delivering results that look great and perform even better.