Hempcrete is a biocomposite material that consists of the woody inner particle of hemp stem called hurds, lime based binder and water. Binders might include different additives.

Different formulations produce various density hempcrete insulation with different thermal properties. The lighter the mix the more energy efficient it is.

All ingredients are placed inside a mixer in a specifiс order and within a few minutes a porridge like material is produced and ready to be applied. Hempcrete cures by absorbing carbon dioxide from the atmosphere and eventually turns into porous stone.

Curing times depend on weather conditions, thickness, water content and areas of application.

Application
Areas of Application

New or Existing Walls

Floors

Roof and Attics

Interstitial Space

Advantages
Advantages
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100% Natural material
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Humidity regulator
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Energy efficient
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Low thermal diffusivity
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Fireproof
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Breathable
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Alkaline environment
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Pest Repellent
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Mold resistant
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Earthquake resistant
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Great sound insulator
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Heating/cooling bill savings
Comparison
Comparison to Other Insulation Products
Different Products
Heat Storage
Heavy materials store heat. In winter, the heat stays better in the house, in summer it stays noticeably cooler, similar to old stone houses or churches.
Heat Reflection
The natural lime binder reflects infrared heat, cold and heat. This is very often not taken into account, although this leads to large energy savings.
Thermal Insulation
Due to the low lambda value, hempcrete insulates very well. With a wall thickness of approx. 30–40 cm, depending on the location and construction of the house, you already fall into the class. Without additional insulation.
Permeable
Due to the low lambda value, hempcrete insulates very well. With a wall thickness of approx. 30–40 cm, depending on the location and construction of the house, you already fall into the class. Without additional insulation.
Humidity Regulation
Hemp stones absorb the moisture in the room air, clean and disinfect it and give it back to the room evenly.
CO² Negative
Mainly due to the rapid growth of the hemp plant (50 × faster than wood), the hemp stone has a negative CO² balance.
Reusable - cradle to cradle
In the future, mankind will have to learn to reuse materials instead of disposing of them. Even ecological materials are not very useful if they are waste after a certain time.
Air Hygiene
Thanks to the lime binding material, the indoor air is disinfected, lime has an antibacterial effect. The ionization and condensation energy create a particularly clean room air.
Longevity, Simplicity
Thanks to the monolithic construction, the material can easily be separated and reused later. Furthermore, the longevity is significantly higher than with other materials because aging processes such as moisture etc. cannot harm the material.
Economically
The monolithic design saves construction costs in the form of working hours, later heating costs and cooling are saved.
Hempcrete Concrete Blocks Poroton Blocks (Clay) Thermal Insulation XPS, EPS (Polysterene Insulation)
info table marker check info table marker check info table marker check Most ecological insulation materials have a relatively low bulk density. So they store heat poorly. They cannot be used as either infill or masonry. XPS and EPS are very light in weight and therefore do not store any heat / cold. Also, due to their low weight, they cannot be used for either infill or masonry.
info table marker check Does not reflect Heat Does not reflect Heat Does not reflect Heat Does not reflect Heat
info table marker check Insulation is limited, usually an ETICS must also be installed Insulation is limited, usually an ETICS must also be installed info table marker check info table marker check
info table marker check info table marker check info table marker check Limited. Many thermal insulation boards tend to mold when there is too much moisture and only poorly insulate when damp. XPS and EPS are not open permeable.
info table marker check No influence on air humidity No influence on air humidity No influence on air humidity No influence on air humidity
info table marker check CO² positive Massive CO² emissions in production CO² positive CO² positive, massive CO² emissions in production and disposal
info table marker check Waste after use Waste after use Waste after use After use hazardous waste
info table marker check info table marker check info table marker check info table marker check info table marker check
info table marker check As a monolithic construction also durable for a relatively long time, not with ETICS. Not reusable In the case of a monolithic construction, it also has a relatively long shelf life, but not with ETICS. Not reusable Not very long lasting Sehr kurze Lebenszeit
info table marker check Also time saving with monolithic construction, not with ETICS Also time saving with monolithic construction, not with ETICS Intricately work The material costs little, but the working hours are many.
Benefits
Environmental Benefits
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Carbon Negative
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Needs only three components
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Produced on site with local materials
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Requires one piece of machinery
Information
Technical Information
  • Thermal Conductivity: 0.06(W/mK)
  • R Value: 2.5 per inch
  • Density: ρ = 260 kg/m3
  • Compressive strength: 1MPa
  • Mean Acoustic absorption Coef: 069 NRC
  • Fire test: 15 cm (6 inch) - El 60 min
  • Specific heat capacity: (с= 1700 J/(kg·K)
  • Water vapour permeability: ∂ = 0.131 mg/ m · h · Pa
  • Water vapour diffusion resistance factor: µ = 5.50