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Natural Jute Insulation: Thermal Performance With Added Eco Advantages

Fintan Wallace

By Fintan Wallace

Thursday 14th March 2019

Fintan Wallace from Ecological Building Systems, a specialist in high performance, environmentally-friendly building materials, discusses the benefits and eco credentials of natural jute insulation.

Natural Jute Insulation: Thermal Performance With Added Eco Advantages Natural Jute Insulation: Thermal Performance With Added Eco Advantages Natural Jute Insulation: Thermal Performance With Added Eco Advantages
Thermo jute is made from using recycled jute fibres from cocoa and coffee bags
Thermo jute is made from using recycled jute fibres from cocoa and coffee bags

 For many self-builders, environmental responsibility is not simply an element that they aim to build into their new home; it’s the whole motivation for building a house in the first place.  With so much mainstream property development overlooking the need for a more environmentally-focused approach to improving thermal performance, reducing waste and enhancing sustainability, the self-build sector is showcasing innovation and best practice. 

However, it’s not always easy to find products that deliver genuine environmental credentials alongside credible building fabric performance, and eco-benefits should never be prioritized over the build quality and service life of a finished property. That’s why natural jute insulation has become such a hero product for selfbuilders across Europe, because it combines an inspirational story of sustainability, upcycling and recyclability with properties that defend against mould and insects and provide excellent indoor climate advantages all year round.

Love at first bite

A sustainable crop that requires only low-level processing, jute has been used for centuries to protect delicate and high-value food items during transit. Fabricated into lightweight, open weave ‘gunny bags’, jute fabric protects commodities like cocoa beans and coffee. Because jute contains no proteins, it is not affected by damp and cannot support insect life, protecting cargo from mould, fungus or infestation during transit.  

Jute gunny bags are still used in this way today and the jute used to make thermo jute insulation is upcycled from bags that transport cocoa used to manufacture Ritter Sport chocolate bars. Produced using a thermo-bonding process that involves 100% eco-electricity, the extremely durable insulation is designed to last for the lifetime of the building and is then totally recyclable, completing the circle of sustainability that starts with a seed in the ground.

Thermo jute is available in batt-form in a range of thicknesses from 30mm-220mm and two widths of 375mm and 580mm
Thermo jute is available in batt-form in a range of thicknesses from 30mm-220mm and two widths of 375mm and 580mm

Self-builder friendly

Overlapping lengths of Jute fitted between rafters on a roof.
Installation of Jute between on a roof

Unlike conventional PIR board insulation, Thermo-Jute is a flexible, fibrous material that can be installed quickly and easily, making it an ideal solution for the hands-on self-builder. Free from harmful ingredients, it will not cause any skin irritation, itching or respiratory discomfort during installation, so no special protective wear is required. The material is suitable for installation between rafters and ceiling joists, between floor joists and in partition and stud wall build-ups, enabling it to be designed into different areas of the construction. This flexibility also maximizes compatibility with a broad spectrum of design styles, including conversion, refurbishment projects and new builds.

During the upcycling process from gunny bag to insulation, Thermo-Jute loses none of the natural properties that makes jute such a useful and versatile material. No mould, mildew or fungus can grow on Thermo Jute, earning the insulation a top rating of ‘0’ (according to EN ISO 846). Protein and starch-free, it is resistant to any insect infestation, helping to protect the fabric of the building and the home environment throughout the lifetime of the finished project. Functionality without compromise. Perhaps the most compelling reasons for installing natural jute insulation are the performance benefits this price competitive solution can provide. With a lambda value of just 0.038, Thermo Jute offers very low thermal conductivity, providing an excellent barrier to cold air during the winter months.

The soft, flexible nature of the insulation material also ensures it can be packed tightly into voids, enhancing airtightness and therefore maximizing the benefits of its thermal performance. When selecting an insulation solution for a self-build project, it’s also important to consider the product’s impact on indoor comfort during the summer months. Thermo Jute’s excellent thermal storage capability significantly reduces the possibility of a home over-heating during warmer weather. Meanwhile, its hygroscopic qualities also help to regulate humidity

The high-density structure even acts as an acoustic buffer, helping to keep a property quieter, as well as supporting a more comfortable, ambient indoor climate.

Specification win-win

Having committed to environmental principles when starting a self-build project, it can be hard to reconcile those aims with the need to create a durable, energy-efficient and comfortable home; but it’s not impossible. The use of natural jute insulation enables selfbuilders to actively protect the environment by using a material that is produced from renewable sources using green energy, in the knowledge that it can ultimately be recycled again.

When all of those environmental benefits are balanced by a price-competitive solution that offers excellent thermal performance for a home that’s warmer in winter and cooler in summer with no risk of mould or insect infestation, it’s a true specification win-win. We may not be able to offer you a calorie free chocolate bar, but upcycled gunny bags insulating your walls, floors and roof is surely as close to guilt-free as it gets!

Image showing the smooth texture of Jute insulation.
Jute can be used on conversions, refurbishments and new builds.

Blog author

Fintan Wallace

Fintan Wallace

Architectural Technologist (Bsc Hons, CEPHC, CEPHT)

Fintan Wallace is an Architectural Technologist at Ecological Building Systems. Graduating from Dublin Institute of Technology in 2011 with a B.Sc (Hons) in Architectural Technology, it was here in D.I.T’s Bolton Street where Fintan developed a strong interest in low energy and Passivhaus design. From here he continued his studies becoming both a Certified European Passivhaus designer and tradesperson. Fintan has travelled to Baden Württemberg in Germany to study passive housing and sustainable energy technology, gaining significant knowledge regarding the use of natural insulations in timber frame and solid wall constructions. Fintan has been involved extensively in a deep energy retrofit of a property to the Enerphit standard in the west of Ireland and now advises on numerous projects throughout the UK for newbuild and retrofit.

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