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The Best Type of Thermal Cladding for Houses

Last modified: 12.02.2019
The Best Type of Thermal Cladding for Houses

Often, when people hear the term' thermal cladding,' it sounds more complex than it actually is. In reality, thermal cladding is simply another name for external wall insulation, a proven method of improving a home’s thermal performance and reducing heat loss. Therefore, it helps to ease the ongoing battle between keeping your home warm and keeping costs down. 

At EWI Store, we specialise in complete thermal cladding systems designed to improve comfort, efficiency and appearance. As well as supplying materials, we can also help connect you with approved installers to ensure the system is fitted correctly and performs as intended. 

External wall insulation (thermal cladding) consists of insulation boards that are fixed to the outside of your home using a combination of specialist adhesive and mechanical fixings. A reinforced basecoat and decorative render are then applied on top to protect the system from the weather and provide an attractive finish. 

This creates a continuous insulation layer around the building, significantly reducing heat loss through external walls. 

Installing a thermal cladding system can offer a wide range of benefits: 

  • Improved thermal comfort: Warmer internal walls and more stable indoor temperature 

  • Reduced energy bills: Less heat loss means lower heating demand 

  • Enhanced external appearance: Modern renders can transform tired facades 

  • Reduced condensation and damp risk: Warmer walls prevent moisture build-up

  • Extended building lifespan: Protection from weathering and thermal stress 

  • No loss of internal floor space: Insulation is added externally 

  • Lower carbon footprint: Improved energy efficiency reduces emissions 

  • Improved acoustic and fire performances: Particularly with mineral wool systems 

We stock a range of insulation boards suitable for thermal cladding systems, each with different performance characteristics. The best option for your home will depend on factors such as breathability, fire performance, compressive strength and budget. 

Our insulation options include: 

  • Wood Fibre Insulation: A breathable, natural insulation that lets the building work as it should while keeping heat in 

  • XPS Insulation: A tough, high-density board that handles moisture and load without fuss 

  • Mineral Wool Insulation: Top-tier fire performance with solid acoustic benefits to match 

  • EPS Insulation: A cost-effective, proven insulation that does the job on most residential buildings

  • Kingspan K5 Insulation: High thermal performance where you need serious results without adding bulk 

Depending on the property size and weather conditions, a typical external wall insulation installation can take between 2 to 3 weeks. All work is carried out externally, allowing minimal disruption to daily life. 

A cement-based adhesive is mixed with water and applied to the back of the insulation boards using a trowel. The boards are fixed to the external walls in a staggered pattern, allowed to cure and then secured with mechanical fixings for long-term stability. 

Once the insulation is fixed, a basecoat adhesive is applied (typically 6-8mm thick). A fibreglass reinforcing mesh is embedded into this layer to provide tensile strength and crack resistance. 

The final step is the application of a thin coat decorative render. This provides a durable, weatherproof finish while allowing the system to perform effectively. Our EWI Pro thin coat renders are ready-mixed and can be tinted to almost any colour, ensuring both performance and visual appeal. 

Thermal cladding is particularly suitable for properties with solid walls or poorly insulated cavity walls. In most cases, it does not require planning permission, though exceptions may apply for listed buildings or properties in conservation areas. 

If you’re unsure whether thermal cladding is suitable for your property, our EWI Pro team can provide guidance on your building type and requirements, including how it interacts with UK Building Regulations.

Choosing the right thermal cladding system, from insulation type to render finish, is key to achieving long-term performance. At EWI Store, our experienced team is on hand to help you select the correct materials and, if required, recommend approved installers. 

Browse our full range of thermal cladding systems or contact us for expert advice before starting your project. 

 

Yes. Thermal cladding lowers the amount of energy required to heat your home by significantly reducing heat loss through external walls. This can lead to noticeable reductions in annual energy bills, particularly in older or solid-wall properties. 

 

Yes. Thermal cladding is simply another term for external wall insulation (EWI). Both terms refer to the same system of externally applied insulation boards finished with a reinforced basecoat and decorative render. 

 

In most cases, thermal cladding does not require planning permission. However, permission may be needed for listed buildings or homes located in conservation areas. It’s always advisable to check with your local authority before starting work. 

 

When installed correctly, a high-quality thermal cladding system can last 30 years or more. Regular visual inspections and basic maintenance will help ensure long-term performance and appearance. 

 

Yes, thermal cladding can be installed year-round, but weather conditions must be suitable. Cold, damp or wet conditions may slow installation and installers may use additives such as render accelerators to aid curing when temperatures are lower. 

 

The best insulation depends on your property type, budget and performance requirements. For example, mineral wool offers excellent fire and acoustic performance, while EPS is a cost-effective option for many residential homes. Our team can help you choose the most suitable insulation for your project. 

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