What is a good natural insulator?

Types of natural insulation Animal-based insulators: sheep wool, feathers and more. Plant-based insulators: hemp, cotton, cellulose, wood fibre, cork and more. Mineral-based insulators: clay, pearlite and vermiculite.

energuide.be - What are the benefits of natural insulation materials? - Energuide

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Natural insulation materials respect both the environment and your health, and are becoming increasingly popular. A further reason for their popularity is that their efficiency is comparable to industrial materials.

Types of natural insulation

There are three types of natural insulation:

Animal-based insulators: sheep wool, feathers and more. Plant-based insulators: hemp, cotton, cellulose, wood fibre, cork and more. Mineral-based insulators: clay, pearlite and vermiculite.

All are beneficial for our health and the environment

Since they do not contain irritating fibres, natural materials are generally not harmful to health. They are also easy to install, as no particular precautions need to be taken. The environmental impact they produce is also much smaller than that of synthetic insulation, even though it is not completely non-existent. Indeed: you must take into account the energy consumption required to manufacture and transport them. and them. you also need to be vigilant with regard to possible synthetic products (e.g. varnishes and anti-insect treatments) which may be used in processing them.

A €15/m2 bonus on energy grants in Brussels

If you live in Brussels and use natural insulation materials made from plant and animal fibres, you are entitled to a bonus grant of €10/m2 in 2019. There is one condition: more than 85% of the layer(s) of insulation must be made from renewable materials, and the material's thermal conductivity must be 0.055 W/mK or below.

Find more details on the 2021 bonus grants in Brussels here.

Each material has its advantages

In addition to the benefits that all natural insulation share, each natural material can boast its own advantageous characteristics. Some are more flexible and can fit perfectly into unusually-shaped spaces, while others come in rigid forms, making them perfect for insulating vertical surfaces.

Hemp (€10 to €25/m2)

Hemp is sold as blocks, rolls and also granules, and is a useful material for a number of reasons:

It is produced in Europe

It is an excellent acoustic insulator

As a moisture-regulating material, it prevents the risk of mildew and fungi

It is fire-resistant: hemp does not catch fire and does not give off toxic fumes A hemp pallet captures approximately 100 kg of CO 2 in the atmosphere

Sheep wool (€10 to €15/m2)

Sheep wool is most frequently purchased washed and treated against mites. However, you can also buy it in untreated form, directly from farmers. It is packaged into rolls of different thicknesses.

It has low flammability

As it is a moisture-regulating material, it can absorb up to 30% of its weight without losing its insulating properties As it is flexible, it can fit into irregular shapes within building structures

Cork (€20 to €40/m2)

Cork is made from tree bark (the cork oak) which is reduced into granules, then heated and agglomerated. It is sold as tiles or granules. Avoid boards which have been reinforced with synthetic adhesives, which give off toxic substances!

Cork is very lightweight

It is rot-proof and waterproof

It is fire-resistant and termite-resistant

Cellulose wadding (€10 to €25/m2)

Cellulose wadding is made from recycled paper and is sold loose (which is less expensive) or as boards.

It has a similar insulation coefficient to glass wool

It is a very good acoustic insulator

It is easy to install

Coconut wool (€25 to €30/m2)

Coconut wool comes from the fibres surrounding coconuts. It is sold as flexible rolls, semi-rigid boards, and also loose.

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