Sustainability in construction has never been more critical, with architects, builders, and homeowners increasingly seeking materials that enhance energy efficiency while reducing environmental impact. One of the most important aspects of sustainable building design is insulation, which plays a crucial role in regulating a building’s energy consumption, thermal comfort, and carbon footprint.
At Allan Corfield Architects (ACA), we champion a ‘Fabric First’ approach that prioritises the use of high-performance, eco-friendly materials to improve long-term building efficiency. In collaboration with Ecological Building Systems , a leading provider of sustainable insulation solutions, we explore the benefits of natural insulation, its impact on energy efficiency, and how it contributes to achieving low-energy building standards such as Passive House.
How does Ecological Building Systems promote sustainable construction?
At Ecological Building Systems, sustainability is at the heart of everything we do. We focus on a ‘Fabric First’ approach, ensuring that natural materials enhance building performance, durability, and energy efficiency. Since our establishment in Ireland in 2000 and expansion into the UK in 2007, we have supplied high-performance ecological products alongside expert technical support to help builders and designers make informed choices. Our mission is to advance sustainable construction through innovative, environmentally friendly materials that improve both comfort and efficiency in homes and buildings.
At Ecological Building Systems, sustainability is at the heart of everything we do. We focus on a ‘Fabric First’ approach, ensuring that natural materials enhance building performance, durability, and energy efficiency. Since our establishment in Ireland in 2000 and expansion into the UK in 2007, we have supplied high-performance ecological products alongside expert technical support to help builders and designers make informed choices. Our mission is to advance sustainable construction through innovative, environmentally friendly materials that improve both comfort and efficiency in homes and buildings.
What are the advantages of sustainable insulation compared to conventional materials?
Sustainable insulation materials provide significant benefits over synthetic alternatives. While conventional insulation options may offer low U-values, their production is often highly energy-intensive, resulting in a large environmental footprint. In contrast, natural insulation solutions such as wood fibre, hemp, grass, and recycled fibres are renewable and have a much lower carbon footprint. Additionally, these materials regulate moisture more effectively, preventing condensation and improving indoor air quality. They also deliver excellent thermal performance, leading to lower energy consumption and reduced heating and cooling costs over time.
What are some of the most effective natural insulation products?
We offer a range of sustainable insulation solutions designed to enhance both performance and sustainability. Gramitherm, made primarily from grass and recycled jute fibres, is a carbon-sequestering insulation that helps lock in carbon for the lifetime of the building. Diathonite Evolution, a breathable insulation plaster, provides superior thermal and soundproofing properties. Gutex Thermoflex, a wood fibre insulation, ensures excellent indoor temperature regulation, while IndiBreathe Flex, made in the UK from hemp and jute fibres, offers outstanding breathability and humidity control. These products contribute to healthier, more efficient buildings while supporting long-term sustainability goals. More details can be found on our website: Ecological Building Systems.
Why is Gramitherm considered a revolutionary insulation material?
Gramitherm is an innovative and highly sustainable insulation option. It is composed mainly of grass, with over 90% bio-based content, actively sequestering carbon and reducing the building's overall carbon footprint. Each hectare of grass used for Gramitherm can produce approximately 200m³ of insulation, and its production process is powered by renewable biogas energy, further minimising environmental impact. Gramitherm’s versatility allows it to be installed in walls, floors, and roofs, making it suitable for both new builds and retrofit projects. Its combination of flexibility, durability, and exceptional thermal performance makes it a standout choice for eco-conscious builders.
How does the choice of insulation influence energy efficiency and heating costs?
The choice of insulation directly impacts a home’s energy efficiency and ongoing operational costs. High-quality insulation serves as a thermal barrier, reducing heat loss in winter and preventing overheating in summer. This leads to lower energy bills by reducing the reliance on artificial heating and cooling. Our natural insulation solutions, including Gutex and Gramitherm, not only provide excellent thermal resistance but also allow buildings to breathe, maintaining a stable and comfortable indoor environment. Their durability ensures long-term efficiency, eliminating the need for frequent replacements, making them a cost-effective and environmentally responsible choice.
What insulation options support low-energy building standards like Passive House?
Achieving Passive House and other low-energy building standards requires insulation that minimises heat loss while maintaining airtightness and effective moisture control. Wood fibre insulation, such as Gutex Thermoflex, is ideal due to its high thermal mass, which helps regulate indoor temperatures. Cellulose insulation is another excellent choice, as it provides high thermal resistance and helps achieve low U-values. To ensure airtightness, we recommend advanced vapour control membranes such as Pro Clima Intello Plus, which intelligently regulate moisture levels to prevent condensation and ensure long-term durability.
For retrofit projects, Gutex Thermoroom internal insulation boards offer an effective solution for improving thermal performance while preserving the building’s character. Additionally, Gutex Thermofibre, a loose wood fibre insulation, is ideal for loft spaces, ensuring complete coverage while reducing thermal gaps. These solutions help meet rigorous low-energy standards while enhancing building comfort and efficiency
Why is airtightness important in sustainable construction, and how can insulation contribute to this?
Airtightness plays a crucial role in reducing uncontrolled heat loss and improving the efficiency of a building’s heating and ventilation systems. While insulation provides thermal resistance, airtightness ensures conditioned air stays inside, reducing energy wastage. Our insulation materials work best when combined with airtight membranes and tapes such as Pro Clima Intello Plus, which create a continuous airtight layer while allowing moisture to escape safely. This combination is especially important in Passive House projects, where airtight construction is essential for meeting energy efficiency requirements.
As the demand for sustainable construction continues to grow, selecting the right insulation is one of the most effective ways to reduce a building’s environmental impact while enhancing performance and comfort. Natural insulation materials provide numerous benefits, from superior thermal efficiency and moisture regulation to carbon sequestration and long-term durability. By incorporating Gramitherm, Gutex, and Pro Clima Intello Plus into building designs, architects and builders can achieve high-performance, low-energy homes that support a healthier environment.
At Allan Corfield Architects, we are proud to work alongside fellow partners at the NSBRC, Ecological Building Systems, an industry leader in sustainable insulation. Through collaboration and informed material choices, we can push the boundaries of energy-efficient construction and ensure that sustainability remains at the core of every project.
If you would like to talk to one of the team about your project, contact us now.
