Building materials


How Thick Should External Wall Insulation Be?

External wall insulation is a popular choice for homeowners in the UK who want to improve their energy efficiency and thermal performance. At Renders World, we specialise in external wall insulation. You’re probably wondering how thick it needs to be. In this article, we will explore the factors including energy efficiency and the insulation material used. To learn more, read on.

Regulating the Thickness

The thickness of external wall insulation can vary depending on factors such as the type of insulation material used and the desired level of thermal performance. Typically, external wall insulation ranges from around 50mm to 150mm in thickness.

Building Regulations and Energy Efficiency Standards

In the UK, building regulations set out the minimum standards for energy efficiency in buildings. These regulations specify the maximum U-value that external walls should achieve, measuring how well the wall retains natural heat. To meet the building regulations, external wall insulation should typically achieve a U-value of 0.21 W/m²K or lower.

Insulation Material and Thickness

The specific insulation material used will affect the required thickness of external wall insulation. Common materials include expanded polystyrene (EPS), mineral wool, and phenolic foam. Each material has different thermal properties and insulation values, which can impact the necessary thickness.

Proper Installation and Considerations

While thickness is important, proper installation and the use of a suitable render system are crucial for the insulation to perform effectively. Consulting with a reputable supplier or installer is advisable to assess specific requirements and recommend the most suitable thickness and insulation material.

Invest in External Insulation With Renders World Today

Investing in external wall insulation can significantly improve the energy efficiency and comfort of your home. Meeting building regulations and considering factors such as insulation material and proper installation, could help create a sustainable and comfortable living environment.

To get a free personalised quote and explore our range of external wall insulation products, visit our website or call us on 02382 002442 We look forward to hearing from you.

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