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Does Silicone Render Really Help Insulate? The Truth About This Popular Building Material

As energy costs continue to rise, many homeowners are looking for ways to make their homes more energy-efficient. Insulation is one of the most effective ways to reduce energy consumption and save on utility bills. While traditional insulation materials like fibreglass and cellulose are common choices, newer materials like silicone render are gaining popularity in the market.

Silicone render is a type of exterior coating made from a combination of silicone, water, and other additives. It’s often used as a finish for buildings and homes due to its weather resistance and durability. However, some experts claim that silicone renders can also provide insulation benefits, making it a valuable addition to a building’s energy-saving arsenal.

This blog post will dive into the science behind silicone render and its insulation capabilities. We’ll explore the pros and cons of using silicone render for insulation and compare it to other common insulation materials. So, if you’re considering using silicone renders for your next building or renovation project, keep reading to learn more about its insulation benefits.

How Insulation Works?

Insulation is a critical component of any energy-efficient building. The primary purpose of insulation is to create a barrier between the interior and exterior of a building, reducing the transfer of heat and maintaining a consistent indoor temperature.

Heat energy naturally flows from warmer areas to cooler areas, which means that in the winter, heat will escape from a building’s interior to the colder outdoors. In the summer, the opposite occurs, with outdoor heat infiltrating a building’s interior. Insulation helps slow down this heat transfer process, reducing the energy needed to heat or cool a building.

Different materials can be used for insulation, including fibreglass, cellulose, foam, and even natural materials like wool or cotton. Each material has its own insulating properties, including thermal conductivity, R-value, and density. These factors impact the effectiveness of the insulation, as well as its cost and environmental impact.

>> Related Reading: How Much Does Flat Roof Insulation Cost: Complete Guide To Flat Roof Insulation

Thermal conductivity measures how easily heat can travel through a material. Materials with low thermal conductivity are better insulators than those with high thermal conductivity. R-value measures a material’s resistance to heat flow, and higher R-values indicate better insulation. Density also plays a role in insulation effectiveness, with denser materials generally offering better insulation.

Overall, understanding the principles behind how insulation works and the properties of different insulation materials is crucial when considering insulation options for your building. In the next section, we’ll explore whether or not silicone render can offer insulation benefits and how it compares to other common insulation materials.

Does Silicone Render Help Insulate?

The insulation properties of silicone render are a topic of much debate in the construction industry. Some experts claim that silicone render can provide significant insulation benefits, while others argue that its impact is minimal at best.

The thermal conductivity of silicone render is one key factor in determining its insulation effectiveness. The thermal conductivity of a material refers to how well it conducts heat. The lower the thermal conductivity, the better the material’s insulation properties.

Research on the thermal conductivity of silicone render has produced mixed results. Some studies have found that silicone render can have a thermal conductivity as low as 0.19 W/mK. Other studies have found higher thermal conductivity values with some even reporting values above 1.0 W/mK.

Despite the mixed research, many experts agree that silicone render can offer some insulation benefits. It’s thickness and density can impact its insulation properties, with thicker and denser coatings providing better insulation. Silicone render also provides a weather-resistant barrier, which can help prevent air leaks and further improve energy efficiency.

Comparing silicone render to other insulation materials, like fibreglass or foam, can be difficult as each material has its own benefits and drawbacks. Fibreglass is a commonly used insulation material that is cost-effective and easy to install. However, it has a lower R-value than silicone render and can be less durable over time. On the other hand, foam insulation has a high R-value and can provide excellent insulation, but it is more expensive and difficult to install.

Case studies and real-world examples of buildings that have used silicone render as an insulating material provide further insight into its effectiveness. One example is the Richmond Olympic Oval in British Columbia, Canada, which used a silicone render coating as part of its energy-efficient design. The building achieved a 60% reduction in energy use compared to similar buildings by using a combination of insulation materials, including silicone render.

Another example is a residential building in London, England, which used silicone render as part of a retrofit insulation project. The building was able to achieve a 30% reduction in energy use after the installation of the silicone render coating.

While the effectiveness of silicone render as an insulation material may vary, it’s clear that it can offer some insulation benefits when used correctly. Its weather-resistant properties, durability, and versatility make it a valuable addition to any energy-efficient building design. However, it’s important to work with a professional and conduct thorough research before choosing silicone render as an insulation material for your building.

Factors to Consider

In addition to insulation, several other factors can impact a building’s energy efficiency. One key factor is air sealing. Air leaks in a building can account for up to 40% of energy loss, so sealing gaps and cracks around windows, doors, and other openings can help improve insulation and reduce energy consumption.

Another important consideration is the building’s orientation and design. South-facing windows, for example, can help capture solar heat in the winter and reduce the need for heating, while shading devices can help block the sun’s rays in the summer and reduce the need for cooling. Passive solar design principles can also be incorporated into a building’s design to take advantage of natural light and heat.

Energy-efficient lighting and appliances can also help reduce energy consumption. LED light bulbs use less energy and last longer than traditional incandescent bulbs, while Energy Star certified appliances are designed to use less energy and water than standard models.

Finally, renewable energy sources like solar or wind power can reduce a building’s reliance on traditional energy sources. Solar panels, for example, can generate electricity for a building while reducing the need for grid-supplied energy.

When considering the insulation and energy efficiency of a building, it’s important to take a holistic approach and consider all factors that can impact energy consumption. By combining insulation with other energy-saving strategies, homeowners and builders can create more sustainable and energy-efficient buildings that save money on utility bills and reduce their carbon footprint.

Pros and Cons of Using Silicone Render for Insulation

One of the biggest advantages is its durability. Silicone render is resistant to weather and moisture, which means it can withstand harsh conditions and maintain its insulating properties over time. It’s also easy to clean and maintain, saving time and money in the long run.

Another advantage of silicone render is its ease of application. It can be applied directly to various surfaces, including brick, concrete, and timber, making it a versatile option for new construction and renovation projects. It’s also available in a wide range of colours and finishes, which can enhance a building’s aesthetic appeal.

On the downside, silicone renders can be more expensive than other insulation materials. While the cost can vary depending on the size and complexity of the project, homeowners and builders should factor in the price of materials, labour, and any additional equipment needed.

In addition, while silicone render can contribute to a building’s overall energy efficiency, it may not be the most effective insulation material. However, when used as part of a larger energy-saving strategy, it can still provide meaningful benefits.

>> Related Reading: Does External Wall Insulation Add House Value?

Final Word

While silicone renders may not be the most effective insulation material on the market, it can still be a valuable addition to a building’s energy-saving strategy. Its durability and ease of application make it a popular choice for many homeowners and builders.

Combined with other energy-saving measures, it can contribute to a more sustainable and comfortable living environment. As with any building decision, weighing the pros and cons and considering all available options is essential.

ProGuard Exteriors are your local experts for external wall insulation, exterior wall coatings, coloured render systems, and exterior painting for your home.

ProGuard Exteriors are your first choice for quality local workmanship throughout the South East of England.

Call us today on 0800 612 5254 to arrange a free quote or get in touch for more information on how to protect and transform your home!

Silicone Render


How does silicone render insulation compare to other types of insulation?

Silicone render insulation has a thermal conductivity value similar to expanded polystyrene insulation, a commonly used insulation material. However, other types of insulation, such as fibreglass and spray foam insulation, have better insulating properties.

Can silicone render insulation be used in all climates?

Yes, silicone render insulation can be used in all climates. It is resistant to weather and moisture, which makes it suitable for use in areas with high humidity or rainfall.

How thick should the silicone render insulation layer be?

The thickness of the silicone render insulation layer will depend on various factors, including the climate, the desired level of insulation, and the type of substrate being used. Generally, a thickness of at least 20mm is recommended for adequate insulation.

How long does silicone render insulation last?

Silicone render insulation is a durable material that can last for many years with proper maintenance. It is resistant to weather and moisture, which helps to prevent deterioration over time.

Can silicone render insulation be applied to existing buildings?

Yes, silicone render insulation can be applied to existing buildings. However, it is important to ensure that the existing substrate is suitable for using the insulation and that any necessary repairs or preparation work is completed before the insulation is applied.

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