Sheep's wool insulation

Natural insulation material with many talents:

Sheep's wool is the only naturally occurring insulating material that keeps you warm and protects you from heat, cold and moisture. The uniqueness of the raw fibre sheep's wool also makes it a material with unique advantages in its end product.



Sheep's wool has the best insulation values

Thermal conductivity is one of the most important insulation values for assessing the effect of insulation materials. It is measured in W/mK (watts per metre and kelvin) and is also known as the lambda value (λtr). The thermal conductivity indicates the amount of heat that passes through the building material.

For a material to act as an insulator, it should have a value below 0.1 W/mK. The rule is that the smaller the thermal conductivity, the better. ISOLENA sheep's wool insulation has a very good insulation value of 0.034 - 0 .042 W/mK.

The actual thermal conductivity is calculated from the combination of materials used. Wood, for example, has a good thermal conductivity value and thus 'helps' other materials with thermal insulation.


Sheep's wool purifies the indoor air

Sheep's wool naturally creates a healthy indoor climate and thus promotes your health. Our ISOLENA sheep's wool is demonstrably able to break down pollutants and odours, as shown in the measurement below from the German Wool Research Institute:

Minimisation of indoor pollutants using the example of formaldehyde.

The secret behind this excellent ability is keratin, the basic protein building block that makes up sheep's wool. The molecules of the amino acid side branches can absorb pollutants such as formaldehyde and neutralise them. This results in a chemical reaction, whereby the pollutants are bound to these molecules or converted.

The closer sheep's wool is installed to the interior, the better the positive effect on the indoor climate. For example, installation levels, partition walls and false ceilings with sheep's wool insulation have a great effect on the indoor air.

Sheep's wool under the microscope

Sheep's wool regulates moisture

Sheep's wool has a hygroscopic effect, i.e., it binds moisture when the air humidity is higher than the compensating humidity of the wool. If the room air is too dry, it releases the moisture again.

Sheep's wool can absorb up to 33% of its own weight in moisture without losing its insulating properties, without becoming damp. It also retains its bulkiness without having a damaging effect on the building fabric.

The reason for this is the unique structure of the protein fibre: it is water-resistant, i.e., hydrophobic. A property that is very advantageous, for example, for installation environments with high condensation.

Another natural advantage of protein fibre is that it does not provide a breeding ground for mould. Therefore, sheep's wool is naturally protected against mould.


Fire protection with sheep wool Fire protection with sheep wool

Sheep wool insulation with fire protection

Due to the consistent use of 100% virgin sheep's wool, the special ISOLENA processing technology and the innovative, biocide-free wool protection IONIC PROTECT®, our sheep's wool insulation achieves fire classification D according to EN 13 501-1.

The natural fibre of sheep's wool has a self-ignition temperature of 560 - 600° C. This is about twice as high as wood (270° C). It shrivels away from any heat source without the material melting.

ETA Prüfbericht ETA Prüfbericht
Schadstoffabbau giftiger Gase. (Quelle: Benisek Phillips, J. Fire Science, Band 1 Nov./Dez 1983)

Effective sound insulation

Due to a different fibre fineness, sheep's wool has very good sound absorption properties for many acoustic situations with higher vocal demands.

You can equip acoustic ceilings with special ISOLENA acoustic tiles or simply with ISOLENA sheep's wool felts.

For good reason, our acoustic products are increasingly being used by architects, civil engineers and builders for kindergartens and schools, office buildings, function rooms, as well as in private homes.


Sheep's wool is a renewable raw material

Sheep's wool insulation represents the insulation material of the present and future for environmentally conscious and ecologically minded people. Only wool from live sheep is suitable to produce insulation materials with such high quality standards.

Furthermore, only sheep’s wool is and remains the permanently elastic, bulky and lively material that it needs to be to fulfil its many tasks as an insulating material.

Ours is the only natural insulation material that integrates 100% into the natural cycle and is completely compostable.


Resistant to moths thanks to IONIC PROTECT®

IONIC PROTECT® is a biocide-free process developed by ISOLENA and protected by a trademark patent to protect wool.

Plasma ion treatment of the wool fibres protects them from all negative influences that can occur in construction. This gives moths and insects no chance to thrive. In addition, our products can be stored indefinitely thanks to the wool protection.

We present you with these terms in writing with the ECO/CUAP test report ECO-P16002-15017 and our product promise.


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Sheep wool insulation is easy to process

Our ISOLENA sheep's wool insulation is delivered ready-made to size. This makes it easy for you to process.

You don't need a dust mask or protective clothing, because the sheep's wool is very kind to your skin and health during further processing.

Cutting to length is very simple by hand or with the ISOLENA cutting device.

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Certified wool origin and processing

Our sheep's wool comes directly from nature, more precisely from sheeps in Central Europe.

All ISOLENA products bear the nature plus® test mark for sustainable building materials, which stands for health compatibility, environmentally friendly production, conservation of finite resources and fitness for purpose.

Demanding tests and the strictest limit values for substances that are hazardous to health throughout Europe guarantee the harmlessness of the certified products.