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Hemp wool has insulating qualities equivalent to those of glass wool or rockwool. In addition to this, it is a very good moisture regulator and it presents no risk of irritation. This insulation with many advantages has, in return, a relatively high price.

Hemp wool: presentation of this insulating material

Hemp wool is a natural material made from hemp, the fibrous part of the hemp plant. After mechanical defibration, the fibers are associated with polyester fibers. According to the technique of manufacture, hemp wool is composed of 40 to 80% of hemp fiber, it can also contain additives such as cotton or jute.

Hemp fibers are particularly resistant, the proof being its use, for centuries, for the manufacture of ropes and naval sails.

Hemp wool may be in the form of rolls, semi-rigid panels or bulk. In this last form, it tends to settle over time, so it is advisable to use it only for the horizontal parts of the habitat. In its other forms, hemp wool may be used for insulation of walls, partitions, attics, roofs and floors.

Performance of hemp wool

Hemp wool has good thermal insulation properties, its thermal conductivity (or lambda) is between 0.039 and 0.045 W / m.K.

She also has good acoustic insulation skills even if she prefers denser panels such as wood wool or cellulose.

On the other hand, given their plant structure, hemp fiber is a very good moisture regulator.

Since hemp wool is an insulator of plant origin, it is inherently fire-sensitive but, most of the time, it is enclosed in materials with fire-resistant properties. In addition, some manufacturers prefer to undergo additional fireproof treatment.

Hemp fibers are naturally prone to attack by rodents or insects and they do not fear pests.

Advantages of hemp wool

  • very good thermal insulation
  • good sound insulator
  • hygrometry regulator
  • good phase shift
  • does not present any allergenic or irritant risk
  • ecological and recyclable material
  • easy pose
  • very good behavior over time
  • naturally rot-proof
  • antifungal, antibacterial, insect and rodent resistant

Disadvantages of hemp wool

The main disadvantage of hemp wool is its price, 4 times higher than that of glass wool or rockwool but, given its thermal, hygrometric, environmental and sanitary performance, it still remains profitable on the duration.

Price of hemp wool

Count around 15 € / m² for a thickness of 100 mm.

Video Instruction: amdro VW T5 insulation using sheepswool and hemp