Sheep Wool Insulation produces thermal and acoustic insulation products made from natural sheep wool. This insulation product is used to reduce heat loss and sound transfer in a variety of applications.

Distributed widely throughout Mongolia are various breeds of local fat-tailed carpet-wool sheep. Totaling nearly 14 million, the sheep of Mongolia are well equipped to withstand low temperatures, unfavorable ecological conditions and poor vegetation. Sheep in Mongolia may be grouped into five types. The common native sheep are multipurpose and low in productivity.

For thousands of years, sheep have been able to adapt to even the harshest of environments, as their wool protects them through hot, cold, damp and dry seasons. In this time, man has also used wool for this very protective property and for the many other benefits offered by the material. Because of their crimped nature, when wool fibers are packed together, they form millions of tiny air pockets which trap air, and in turn serve to keep warmth in during winter and out in the summer.

Wool's unique advantage is its breath ability. That is its ability to absorb and release moisture from the surrounding air, without compromising its thermal efficiency. When wool fibers absorb moisture, they generate tiny amounts of heat. This warmth acts to prevent condensation in construction cavities by maintaining the temperature above the dew-point in damp conditions. This property creates a natural buffering effect, stabilizing heat changes that occur with relative humidity. Practically, this reduces the need to keep adjusting heating or cooling levels as wool insulation will keep a buildings cooler during the day and warmer during the night.

Crimped wool fibers also give the manufactured product particularly good resilience. This means that insulation made from wool will retain its thickness, one of the main contributors to insulation efficiency. As wool contains moisture, it is fire resistant, extinguishing itself when the source of flame is removed. It is also a very effective airborne and structure borne acoustic insulation, significantly reducing noises that can be heard throughout a building.

Being made from a naturally produced fiber, Sheep Wool Insulation requires less than 15% of the energy required to produce than glass fiber insulation. It can absorb and break down indoor air pollutants, such as formaldehyde, nitrogen dioxide and sulphur dioxide. Wool is a sustainable and renewable resource, that has zero ozone depletion potential and at the end of its useful life can be re-manufactured or biodegraded. Sheep wool insulation is safe and easy to handle and no protective clothing or special breathing apparatus is required to install it.

Material Advantages

  1. Wool is natural, renewable and sustainable
  2. Sheep Wool Insulation is perfectly safe to touch and requires no specialized safety clothing or equipment, making it easy to install
  3. It causes no irritation to the eyes, skin or lungs and wool fibers present no hazard to your health
  4. Wool fibers are breathable, meaning they can absorb and release moisture without reducing thermal performance unlike fiber glass based products
  5. Wool does not support combustion and will extinguish itself in the event of fire
  6. Sheep Wool Insulation does not settle due to the high elasticity of the wool fibers ensuring no loss of performance over time

Saving Energy

  1. Wool is designed by nature to save energy
  2. Sheep Wool Insulation also requires only a fraction of the energy to produce compared to that of man-made counterparts
  3. This means that Sheep Wool Insulation will pay back its energy costs more than 5 times sooner (only 15 kW of energy are used to produce 1 m³)

Performance Benefits

Wool has a higher fire resistance than cellulose and cellular plastic insulation

  • It does not burn, but instead singes away from fire and extinguishes itself (Wool has a very high inflammation point of 560°C due to its high Nitrogen content of ~16%) Wool is self extinguishing because of its high Limiting Oxygen Index (LOI=25.2), which means to completely burn wool an oxygen content of 25.2% is necessary whereas air only has 21%
  • Wool fibers are hygroscopic by nature, meaning the can absorb up to 35% of their own weight from the surrounding atmosphere depending on the humidity, helping to preserve the surrounding timbers.
  • While absorbing this moisture, wool releases energy in the form of heat, thus raising the temperature of its surrounding areas. Naturally releasing this moisture in the warmer seasons, wool creates a cooling effect on the same surroundings.
  • Sheep Wool Insulation rolls are produced to standard width requirements – saving time when fitting
  • Multiple layered wool fibers effectively reduce airborne sound transfer

Comparison of sheep wool thermo-acoustic blanket with normal thermal insulation

Performance Sheep wool Glass wool Rock wool
slag wool
Flexible plastic foam
Thermal conductivity good good normal good
Acoustic good good good bad
Combustibility Class B1,
no toxic gas
Class A/B1 ,
release toxic gas
release toxic gas
Class B1/B2,
release high density toxic gas


Construction easy, comfortable
for the worker
have intense stimulate to the respiratory system and skin of the workers have intense stimulate to the respiratory system and skin of the workers some difficult
Physics/chemistry stable,
no aging
stable, frangibility, pulverization stable, frangibility, pulverization no stable, aging, easy to crack
Economical reusable,
cannot reuse,
cannot reuse,
cannot reuse,

The amount of insulation that you need will depend on the type of your house, where you are insulating and if you have existing insulation in place. For attics in new houses, the regulations require a minimum of 240mm thick (3 layers of 80mm) of Sheep's Wool Insulation which is ample for future performance and comfort. For external walls in a timber frame home, the requirement is 140mm thick (60mm+80mm), which is standard and up to 200mm thick (two layers of 100mm) for super insulated homes. Sheep Wool Insulation is not suitable for use in the cavity of block cavity walls. Internally, Sheep Wool Insulation is usually installed to 80mm or 100mm thick between stud partitions and from 100mm thick upwards between the floors for thermal/acoustic purposes. For roofline installations (dormer/cathedral ceilings where the insulation follows the roof shape) the requirement is 200mm (two layers of 100mm) to achieve the desired performance and comfort.