Internal Wall Insulation in South East England

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South East Coverage

25-Year Guarantee

20 Years Experience

 CERTIFIED CORKSOL APPROVED INSTALLERS

Internal Wall Insulation

ProGuard Exteriors specialise in ultra-thin, breathable internal wall insulation using Corksol spray-applied coatings—designed for comfort, performance, and moisture control in solid wall and heritage properties.

Corksol is a next-generation natural cork solution applied directly to internal walls to enhance thermal insulation, regulate moisture, and reduce noise—all without the disruption or thickness of traditional insulated plasterboard or stud systems.

Compatible with multiple finishes, Corksol can be left as a decorative surface, finished with a smooth plaster skim, or painted using vapour-open emulsions. Hybrid systems are also available, combining Corksol insulation with specialist breathable finishing plasters for enhanced thermal and aesthetic performance.

Ideal for older buildings, small rooms, or areas prone to condensation, our internal spray cork insulation provides lasting benefits with minimal loss of space or aesthetic compromise…

✅ Ultra-thin thermal insulation with just 8 to 12mm build-up to preserve room size

✅ Breathable and moisture-regulating to prevent condensation and mould

✅ Seamless spray application applied directly onto existing plaster or masonry

✅ Acoustic comfort with natural sound dampening qualities

✅ Eco-friendly and sustainable made from 100% natural cork

Perfect for solid walls, heritage properties, curved surfaces, and small or awkward spaces, Corksol is the smart modern alternative to bulky internal insulation boards. Every installation is carried out by our Corksol Approved Applicators with attention to detail, clean finishes, and full aftercare.

Book your free survey today and discover how Corksol internal insulation can improve warmth, comfort, and moisture protection—without compromising space or character.


Internal Wall Insulation

Traditional internal wall insulation systems such as insulated plasterboard or studwork can reduce room size, trap moisture, and cause disruption during installation. Corksol offers a modern, ultra-thin alternative that solves these problems.

Spray-applied directly to internal surfaces, Corksol creates a continuous, breathable layer just 8 to 12mm thick. It improves thermal performance without compromising space, appearance, or the health of your walls. Especially suited for solid walls, heritage properties, and rooms affected by condensation, Corksol regulates humidity naturally and helps prevent mould growth.

Unlike rigid boards, Corksol is flexible and ideal for curved walls, chimney breasts, and other awkward spaces. The seamless coating eliminates cold bridging and can be finished with plaster, paint, or decorative textures to suit any interior.

Made from 100% natural cork, Corksol is fire-resistant, hypoallergenic, and one of the most sustainable insulation materials available. It also improves acoustic comfort, making it a smart solution for both thermal and sound insulation.

Upgrade your interior walls with breathable, space-saving Corksol insulation. Request your free quote today and discover the benefits of natural cork for comfort, efficiency, and indoor air quality.

 

How Corksol Compares to Traditional IWI Systems

A staggering 35% of heat escapes through the walls of an uninsulated property, resulting in freezing walls and chilly rooms. Many homeowners attempt to combat this issue by cranking up their heating, which can lead to exorbitant costs.

When heating a home with solid walls, warm indoor air often meets cold internal surfaces, leading to condensation. Over time, this moisture builds up due to temperature fluctuations, causing mould and damp problems. Our internal spray cork wall insulation tackles this issue by creating a breathable, thermally insulating barrier that helps regulate moisture and maintain a healthier indoor environment…

Feature / Consideration Corksol IWI Traditional IWI (Boards / Studs)
Thickness 8–12mm build-up 60–120mm typical thickness
Space Loss Minimal to none Significant loss of floor area
Breathability Fully breathable Often requires vapour barrier; can trap moisture
Moisture / Mould Risk Very low – cork regulates humidity Higher – moisture can get trapped behind boards
Installation Disruption Low – sprayed on, no major construction Moderate–high: battening, boarding, plastering, socket adjustments
Cold Bridging None – continuous layer Common around fixings and frame edges
Adaptability to Curves / Uneven Walls Excellent Difficult or impossible
Acoustic Improvement Good Good–very good depending on board type
Eco-Friendliness Natural, renewable material Boards often include plastics, foams, adhesives
Cost Mid-range Wide range; cheaper basic options but more labour-intensive overall
U-Value Improvement Moderate (best for space-constrained or breathable wall projects) High (can achieve very low U-values with thicker boards)

Eco-Friendly & Sustainable

Cork is a renewable, eco-conscious insulation material harvested from the bark of cork oak trees, making it a responsible environmental choice.

Improved Energy Efficiency

Spray cork offers excellent thermal insulation, reducing heat loss through walls and helping regulate the internal temperature of your home.

Save Money on Heating Bills

Naturally resistant to moisture, damp, and mould, cork helps protect your home from weather damage, UV rays, and other external factors, lowering maintenance costs.

Reduce Noise Pollution

Cork’s natural sound-absorbing properties help reduce external noise, such as traffic and neighbours, creating a quieter living environment.

Our spray cork insulation installation experts are fully insured and accredited, and approved applicators of CorkSol, boasting over 20 years of experience. We design custom residential spray cork packages for homeowners throughout South East England.

Wherever you are in our service area you can trust ProGuard Exteriors to enhance and protect your property with expert care and quality workmanship. If you’re considering internal wall insulation reach out to our team for a free, no-obligation spray cork insulation quote today…

 


Why Choose Proguard Exteriors?

ProGuard Exteriors are trusted insulation and rendering specialists offering guaranteed, accredited services across the South East…

Over 20 Years Of Experience

Benefit from our extensive industry knowledge built over 20+ years of hands-on experience

Up To 25 Years Guarantee

Enjoy peace of mind with our long-term guarantees of up to 25 years

Wide Coverage Across South East England

Serving a broad range of areas throughout South East England with local teams ready to assist

Free Survey, Quote & Expert Advice

We offer free on-site surveys, quotes, and tailored expert advice with no obligation

Highly Recommended By Previous Customers

Trusted and praised by homeowners and businesses for professionalism, quality, and outstanding service

All-In-One Insulation & Rendering Packages

Streamline your project with comprehensive, all-in-one solutions for insulation and exterior rendering

Endorsed Standards & Protection

Trusted for meeting rigorous industry standards, with extra peace of mind from independent protection schemes

Manufacturer Approved

Trusted by leading insulation and rendering system manufacturers for our proven quality and expertise

Residential & Commercial Tenders

Equipped to handle both residential jobs and large-scale commercial or public sector tenders

Looking for Spray Cork Insulation Specialists In South East England?

ProGuard Exteriors are trusted interior wall specialists delivering solutions to protect buildings and enhance energy efficiency

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ACCREDITED & FULLY INSURED

Our installers are fully insured and accredited by leading industry bodies. Whether working on residential rendering, external wall insulation, or large commercial projects, our highly trained team ensures reliable results with complete safety and compliance.

TRUSTMARK APPROVED

ProGuard Exteriors is endorsed by Trustmark and QualityMark Protection, guaranteeing that our services meet the highest industry standards. These recognitions provide assurance of quality, reliability, and professionalism across all our insulation and rendering solutions.

FREE QUOTES

ProGuard Exteriors offers free, no-obligation quotations for all spray cork, wall coating, insulation, and rendering projects. Whether you’re refreshing a home facade or upgrading a large commercial property, our experts are ready to help you achieve lasting protection and style.

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    ProGuard Exteriors Ltd

    🇬🇧 Registered Office: 4 Cromwell Court, New Street, Aylesbury, Bucks HP20 2PB
     Registered in England and Wales No. 10352234 | VAT Number: 265 6002 17

     enquiries@proguardexteriors.co.uk
     03316 300 082
     Monday to Friday 8:00am - 6:00pm / Weekends - Closed

        


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