Raw material

Frequently asked questions


What is hemp fiber insulation?

Hemp fiber insulation is a natural insulation material made from fibers from the industrial hemp plant. It is known for its positive sustainability properties, such as low carbon footprint, low energy consumption, absence of harmful emissions and excellent thermal properties. By using hemp fiber insulation, one can take advantage of its ability to reduce energy requirements and at the same time bind carbon dioxide in the material.

Is it legal to grow industrial hemp?

Yes, it is legal to grow industrial hemp in many countries around the world, including several countries in Europe, North America and Asia. Industrial hemp is a variant of the hemp plant that is intended for industrial use and contains very low levels of the psychoactive compound THC (tetrahydrocannabinol), which is the substance that provides the notorious “high power” associated with recreational purposes.

In Sweden, the cultivation of industrial hemp has been legal since 2003, following a change in the law that allowed the cultivation of the hemp plant for industrial use. To grow industrial hemp in Sweden, it is required that the grower use seed varieties approved by the Swedish Environmental Protection Agency and that a notification about the cultivation be submitted before it starts. The Swedish Environmental Protection Agency then carries out random sampling and checks that the registered seed variety is used. There are also rules and regulations governing the handling and use of industrial hemp to ensure that it is used legally and responsibly.

Regulations and laws surrounding the cultivation of industrial hemp vary from country to country and may be influenced by national laws, international agreements and local regulations. In many cases, a permit or license is required to grow industrial hemp, and there may be regulations regarding the location of the crop, the handling of the plants, and how the hemp plant may be used. It is important for those interested in growing industrial hemp to understand and comply with the specific laws and regulations that apply in their jurisdiction.

How is hemp fiber insulation made?

Hemp fiber insulation is manufactured by processing fibers from the industrial hemp plant into various shapes (sheets, rolls and loose wool) that are adapted for insulation applications. The manufacturing process involves scavenging, crushing and spinning to produce high quality insulation materials.

What are the advantages of using hemp fiber insulation?

The benefits of using hemp fiber insulation are many and extensive. Firstly, it has a low thermal conductivity (lambda), which means that it effectively reduces heat transfer and helps maintain a constant indoor temperature. Its high specific heat capacity also makes it particularly efficient at storing and releasing heat over time, resulting in a more even and comfortable temperature indoors.

Another significant advantage is the ability of hemp fiber insulation to buffer moisture. By absorbing and releasing moisture into the air, it helps regulate indoor humidity levels, creating a more comfortable and healthy environment. In addition, this moisture buffering helps reduce the risk of mold and mildew formation in the building.

Another advantage is that hemp fiber insulation has no harmful emissions and is very pleasant to handle. It does not itch and is therefore often appreciated in the workplace by fitters and craftsmen.

Emission tests show very low emissions of harmful substances, which is due to the fact that the insulation does not initially consist of any harmful substances. This combination of properties makes hemp fiber insulation an attractive and durable choice for insulation needs.

What are the properties of hemp fiber insulation?

Hemp fiber insulation has several outstanding characteristics that make it an attractive choice for insulation purposes. Firstly, the product is certified and carries a CE marking, which guarantees its quality and compliance with current standards. The insulation is distinguished by its low density and low thermal conductivity, which means that it has excellent insulating properties. Its ability to effectively retain heat inside and resist temperature variations makes it particularly suitable for different climatic conditions and construction projects.

In addition to its thermal properties, hemp fiber insulation also has good acoustic and fire resistance properties, which contributes to a safer and more comfortable environment. Another significant advantage is that the insulation is bio-based and made from renewable raw materials. This allows hemp fiber insulation to be carbon negative, meaning it binds more carbon dioxide than is generated during the manufacturing process. As a result, the product has a low climate footprint and contributes to sustainable building practices and environmentally friendly projects.

Is Ekolution hemp fiber insulation certified?

Yes, Ekolution's hemp fiber insulation is certified and carries an ETA (European Technical Assessment) as well as a CE marking to confirm its compliance with the relevant technical standards. In addition to these certifications, Ekolution has conducted tests on RISE to ensure that the product meets the requirements for EPD (Environmental Product Declaration), emissions, fire tests, moisture and other relevant quality tests.

Is Ekolution hemp fiber insulation available as an assessed construction product?

Yes, Ekolution's hemp fiber insulation is a rated construction product and is listed with several authorities and independent comparison platforms. It is approved by Byggvarningen, Sundahus, BASTA and is registered in Svanen's database. In addition, the product can be found on several independent comparison platforms such as Prodict, OneClickLCA, Bidcond, Revalu and Svensk Byggtjenester.

What types of buildings are suitable for hemp fiber insulation?

Ecoluation hemp fiber insulation is an adaptable and versatile product suitable for a variety of applications in construction and insulation projects. For buildings, the insulation is suitable for various parts of the above-ground climate shell, such as interior walls, outer wall, intermediate joists and roof structures. More detailed suggestions for suitable construction parts can be found in the “Building Parts” section to make it easier for users to choose the right insulation solution for their specific needs.

However, there are some designs in which the use of hemp fiber insulation should be avoided. It is especially true for unprotected structures with high moisture pressure, such as external insulation or insulation in basements where the risk of prolonged exposure to moisture is high. In addition, it is less appropriate to use hemp fiber insulation in constructions where the main function of the insulation is fire protection, especially if the fire classification requires an insulation with higher fire resistance than the hemp fiber insulation can offer (e.g. fire class C or higher).

By carefully considering which designs and uses are suitable for Ecolution hemp fiber insulation and avoiding the limitations mentioned above, one can ensure that the insulation works optimally and contributes to the creation of energy-efficient and sustainable buildings.

What is the cost of hemp fiber insulation compared to other insulation materials?

Comparing the cost of hemp fiber insulation with other insulation materials can be complex because it depends on several factors, including region, availability of materials, and the scope of the project. Generally speaking, hemp fiber insulation can be slightly more expensive than traditional insulation materials such as mineral wool, and is more comparable to other bio-based insulation. With Ekolution's latest effort to build a production facility in Skåne and establish a domestic supply chain, the price for hemp fiber insulation is expected to be able to compete more effectively on the market. This can make Ekolution's hemp fiber insulation a more attractive and economical option for insulation needs in construction projects.

An important aspect to consider when comparing costs is also that hemp fiber insulation can offer several long-term economic benefits, including energy savings and reduced operating costs for heating and cooling the building. In addition, hemp fiber insulation may be a more sustainable option given its low environmental impact and ability to bind carbon dioxide during the manufacturing process. In addition, insulation is a volume of product that constitutes a small item in the total cost budget of a construction project, but constitutes a significant part of the total climate budget.

It is always best to contact your dealer or nearest building materials store and request price details to get an accurate comparison between hemp fiber insulation and other insulation materials based on the specific needs and conditions of your project.

What sizes and shapes are available?

Ecoluation hemp fiber insulation is available in thicknesses mm

Wood rulers/Wood Tube s450 b425 and s600 b575
Steel bars s450 b470 and for s600 b620.

Length 1200 mm for all dimensions.

What is the service life of hemp fiber insulation?

The service life of hemp fiber insulation depends on several factors, including proper installation, exposure to moisture, and other environmental factors. Generally speaking, hemp fiber insulation is expected to have a long service life when installed correctly, 60 years.

Thermal Performance

What are the thermal properties of hemp fiber insulation and how do they affect energy efficiency?

Hemp fiber insulation has excellent thermal properties that make it an effective insulation material. Its ability to minimize heat loss and dampen temperature and humidity fluctuations helps create a more stable indoor environment. By retaining heat efficiently, the hemp fiber insulation can help reduce the need for heating and thus lower the energy costs of a building.

For more detailed information on the thermal performance of hemp fiber insulation, we recommend that you read our technical manual section “Technical Thermal Performance”.

How does hemp fiber insulation work compared to other insulation materials?

Hemp fiber insulation works through its porous structure, making it effective in sound absorption and thermal insulation. Compared to other materials, such as synthetic or fossil insulation, hemp fiber offers a renewable insulation solution with a low carbon footprint.

Bio-based insulation materials, including hemp fiber insulation, utilize air pockets in the material to reduce thermal conductivity (lambda). By trapping air in small spaces between fibers or particles, effective barriers are created that impede heat transfer through conduction, radiation, and convection. This property results in an effective insulation that helps to create an energy-efficient indoor climate.

Ekolution hemp fiber insulation, specifically, is distinguished by its high specific heat capacity. This makes the insulation heat-hazy and less sensitive to temperature variations in the surrounding environment. By minimizing heat transfer through walls and ceilings, hemp fiber insulation can contribute to lower energy costs and a reduced environmental impact.

What is the recommended thickness of hemp fiber insulation for optimal insulating effect?

The recommended thickness for hemp fiber insulation varies depending on specific requirements and building standards. Generally speaking, a thicker insulation can provide higher insulating power. To give an idea of the thermal resistance of different thicknesses of hemp fiber insulation, the following table can be used:

Thermal conductivity (λ) = 0.04 W/ (m K)

Specific heat capacity (c) =2300 J/ (kg K)

Thickness (mm) Heat resistance (R-value)
45 1,125
70 1.75
95 2,375
120 3
145 3,625
170 4.25
195 4,875
220 5.5

What factors can affect the insulating performance of hemp fiber insulation over time?

Factors that can affect the insulating performance of hemp fiber insulation over time include:

1. Moisture absorption: If the hemp fiber insulation is exposed to high humidity or water intrusion, its insulating ability may deteriorate over time.

2. Compaction: If the insulation is compressed or packed together, its insulating properties may decrease as the air pockets within the material decrease.

3. Damage: Physical damage to the insulation material, such as tearing or compaction, can affect its ability to retain thermal insulation.

4th. Degradation: Exposure to UV radiation or chemicals can cause degradation of the hemp fiber insulation over time, which can lead to impaired insulation performance.

5. Installation: Improper installation or lack of coverage of the insulation can create cold bridges or air leaks, reducing its effectiveness over time.


Is hemp fiber insulation sensitive to moisture and what is being done to protect it?

Hemp fiber insulation has a moisture buffering ability, which means it can absorb and emit moisture in smaller amounts for shorter periods of time without losing its insulating properties. To ensure effective installation, the use of a steam brake is recommended to create the required airtightness. This allows the design to become diffusion-open, meaning it can “breathe”.

Evolutions' hemp fiber insulation is tested according to EN ISO 846, method A, B, B', for mold growth with the best results, 0-Growth, on a scale 0-5 (where 0 corresponds to no growth and 5 heavy eutrophication). This demonstrates the insulation's resistance to mold formation, which is crucial for its long-term durability and effectiveness.

In order to further ensure the performance of the insulation, critical moisture conditions have been determined by testing at RISE according to standard SP Method 4927:2013. Furthermore, the critical moisture condition of Ekolution hemp fiber insulation at 22°C has been determined to be 75% ≤ RFKRIT ≤ 80%, which is achieved after 6-8 weeks. This means that the insulation retains its properties within a reasonable level of humidity and is not degraded by normal humidity variations.

However, it is important to avoid direct contact with rain, running water and prolonged exposure to moisture, as this can negatively affect the performance and durability of the insulation.

To protect the hemp fiber insulation, care should be taken to ensure that the structure is well ventilated to minimize the risk of moisture accumulation. It is also of utmost importance to identify and fix any moisture problems in the building before installing the insulation to avoid future damage or deterioration of the insulation material.

For more detailed information on how the hygroscopic properties of hemp fiber insulation affect its thermal performance and to obtain recommendations on handling and installation, it is recommended to turn to Ekolution's technical manual and section on moisture. There you can get specific advice and guidelines adapted to the current insulation project.

Can hemp fiber insulation be used in damp areas such as bathrooms?

Yes, Ekolution hemp fiber insulation can be used in bathrooms and other wet rooms, provided that the insulation is protected from direct contact with water according to industry standards. This means that the insulation should be installed with a waterproofing layer to prevent moisture ingress, and moisture-resistant boards are used for additional protection. By following these guidelines, the hemp fiber insulation can ensure optimal performance and durability even in humid environments such as bathrooms.

Can hemp fiber insulation be used in cold climates where the risk of condensation is higher?

Yes, hemp fiber insulation can be used effectively in cold climates where the risk of condensation formation is higher. To ensure optimal operation of the insulation and prevent possible condensation formation, it is important to take the following measures:

1. Ensure that there is adequate ventilation in the building to reduce humidity and allow evaporation of any condensation.

2. Install vapor barriers or steam brakes as needed to control moisture transfer and prevent moisture from entering the insulation.

3. Ensure that the insulation is properly installed and covers all surfaces evenly to minimize cold bridges and thus the risk of condensation formation.

By taking these measures into account, hemp fiber insulation can be used effectively and safely even in cold climatic conditions.


Is hemp fiber insulation fire rated and safe to use in various construction environments?

Yes, Ekolution's hemp fiber insulation is fire rated and safe to use in various construction environments. It has been tested according to EN 13823+A1 and EN ISO 11925-2_2020 standards for fire performance, ensuring that the insulation meets the necessary safety requirements for use in various construction projects.

What fire grade does hemp fiber insulation have?

The Evolutions hemp fiber insulation has fire class D, s1 d0. For further information on fire classes and fire characteristics, it is recommended to consult the Ekolution technical manual and the section on fire.

Hemp fiber insulation is organic, how come it achieves such a high fire rating?

The hemp fibre insulation achieves a high fire rating thanks to the use of a fire-retardant additive in the form of a food-grade mineral salt. The fire retardant effect of the mineral salt helps to reduce the risk of fire and spread of fire in the insulation material, resulting in a higher fire rating for the hemp fiber insulation.

How does hemp fiber insulation contribute to fire safety?

Hemp fiber insulation contributes to fire safety by resisting fire and delaying its spread because hemp, like wood, is charred during combustion, inhibiting fire progression

Can hemp fiber insulation be used in ordinary houses considering fire safety?

Yes, hemp fiber insulation can be used in ordinary constructions, together with ordinary sheet cladding, fire resistance equivalent to EI30-120 can be achieved.


How are Ekolusions hemp fiber insulation properties?

Yes, Ekolution's hemp fiber insulation has undergone rigorous sound absorption tests according to European standards such as EN ISO 354 and EN ISO 11654. In addition, its airflow resistance has been tested according to EN 29053, method A, to ensure its overall acoustic performance and quality.

Are the acoustic properties tested according to a standard?

Yes, Ekolution's hemp fiber insulation has been tested for sound absorption according to European standards EN ISO 354 and EN ISO 11654 and air flow resistance according to EN 29053, method A.

What noise reduction can be achieved?

Evolutions' hemp fiber insulation has been classified as sound absorption class B, indicating its ability to effectively absorb sound. At a thickness of 100 mm, the insulation has been shown to achieve the following values of sound reduction at different frequency bands:
Hz to ap
125 0.40 0.35
250 0.65 0.60
500 0.82 0.80
1000 0.81 0.85
2000 0.89 0.90
4000 1.03 1.00

Is Ekolution hemp fiber insulation used as a sound absorber?

Ekolution hemp fiber insulation can be used as a sound absorber in the form of boards suitable for mounting on walls or ceilings to reduce reverberation and improve the acoustics of various rooms. Although the insulation is primarily intended for thermal insulation, Ekollution strives to develop specialized sound absorbers to better meet the needs for noise reduction in different environments.

Climate impact

What gives industrial hemp such good climate properties?

Industrial hemp, used as raw material for Ecolution's hemp fiber insulation, is a fast-growing plant that requires minimal pesticides and no artificial fertilizer. Its cultivation helps absorb carbon dioxide from the atmosphere and improve soil health. Hemp is also a resource-efficient material, in which all parts of the plant can be used for different purposes, minimizing waste and resource consumption. This gives industrial hemp excellent climatic characteristics compared to other crops and creates a renewable resource used in a circular bioeconomy.

What does it mean for Ecoluation hemp fiber insulation?

For Ekolution's hemp fiber insulation, the use of industrial hemp as raw material means that the product is renewable and has a low climate impact. By choosing an insulation made from industrial hemp, users can reduce their environmental impact and help promote sustainable and climate-smart construction projects.

What does GWP mean and how does Ekolution hemp fiber insulation perform

GWP stands for Global Warming Potential and measures the long-term climate impact of greenhouse gas emissions. Ekolution's hemp fiber insulation has a low GWP thanks to its renewable source and minimal processing. By choosing Ecolution's hemp fiber insulation, users can reduce greenhouse gas emissions and help slow climate change.

What are the additional climate indicators and how does Ekolution's hemp fiber insulation perform there?

In addition to GWP, additional climate indicators may include energy consumption during production, use of renewable resources, waste management, and the possibility of recycling or degradation at the end of the insulation lifecycle. By evaluating these factors, users can get a more complete picture of the environmental impact of Ekoluction hemp fiber insulation and how it compares to other insulation materials.

Ecolution's hemp fiber insulation performs well in terms of additional climate indicators. It is produced with low energy consumption and uses industrial hemp which is a renewable resource. In addition, the insulation is biodegradable and can be recycled, reducing its footprint on the environment. By harnessing these positive qualities, Ekolution's hemp fiber insulation can help promote sustainable and environmentally friendly construction projects.

What is an EPD and does Ecolution have one?

An Environmental Product Declaration (EPD) is a standardized report that quantifies the environmental performance of a product based on a comprehensive analysis of its life cycle. Evolutions' hemp fiber insulation has an EPD available, providing users with transparent information about the product and its environmental impact. By providing an EPD, Ekolution demonstrates its commitment to being transparent and helping customers make informed choices for their construction projects. Link to EPD


How does the use of Ecolution hemp fiber insulation affect the working environment of installers?

Yes, Ekolution's hemp fiber insulation is safe for health. It is made from natural hemp fibers without the addition of hazardous chemicals or allergens. This makes it a safe and sustainable choice for both humans and the environment.

Are there any allergenic substances in the hemp fiber insulation?

No, the hemp fiber insulation does not contain any allergenic substances. It is made from pure and natural industrial hemp, recycled textile fibers and a food-grade mineral salt, making it suitable for people with sensitive airways or allergies.

Is Ecolution hemp fiber insulation tested for emissions of harmful substances?

Evolutions' hemp fiber insulation has been tested for emissions of harmful substances according to SS-EN ISO 16000-9:2006 and ISO 16000-3:2011 after 28 days. Below are the specified test results:

Requirements Result
VOC < 0.2 0.022 Approved
Formaldehyde < 0.05 0.001 Approved
CMR 1A+1B < 0.001 < 0.001 Approved
Single VOC (μg/m3) EU-L CI < EU-LCI Approved

How does the use of Ecolution hemp fiber insulation affect the working environment of installers?

The insulation is easy to handle with just the right tool (see cutting tools) and its natural composition and soft texture make it pleasant to handle and does not cause inconvenience. Fitters and handlers are always advised to use appropriate protective equipment such as goggles, gloves and a protective mask.

How does Ecolution hemp fiber insulation contribute to a better indoor environment?

Ecolution hemp fiber insulation contributes to a better indoor environment by creating a more comfortable temperature and humidity. Its natural properties help regulate humidity. This creates a more healthy and comfortable environment for residents and can reduce the risk of airborne allergies and respiratory problems.

In The Workplace

Transport and offloading

Ecoluation hemp fiber insulation is transported on sea pallets (1200x1200) and is on average about 2.5 m high. On MEGA trailers for it place 22 pallets. For more information logistics please see logistics file

Storage at construction site

After unloading from transport, they should be immediately placed in a weatherproof place with protection from direct precipitation. Longer storage in poorly ventilated environments where moisture can accumulate is not recommended, such as a tarpaulin.


Evolutions' hemp fiber insulation contains industrial hemp 87%, recycled textile fibers 10% and 3% fire retardant. Sorted as hemp on construction site

How to install hemp fiber insulation?

Hemp fiber insulation can be easily installed thanks to the flexibility of the insulation material and is user-friendly for workers to handle. It is recommended to cut the insulation with approximately 20 mm overdimensions to ensure a good abutment to the structure and thus achieve optimal performance.

To install hemp fiber insulation, follow these steps:

1. Measure the area where the insulation will be installed to determine how much hemp fiber insulation you need.

2. Be sure to take into account any gaps or spaces between the insulation and the wall or ceiling structure.

3. Prepare the area for installation by removing any old insulation or debris and making sure the surface is clean and dry.

4th. Use a joint tail with a wavy blade or an insulating saw from FESTOOL to cut the hemp fiber insulation with approximately 20 mm oversize so that it can be easily flexed into the space.

5. Position the insulation between the joists and gently compress both sides. This allows the insulation to take advantage of its “springy effect” and fit snugly between the joists. When it returns to its original shape, it will fit snugly against the joists and reduce the risk of cold bridges.

Be sure to install the necessary steam brakes or thermal barriers to ensure that the insulation works effectively. Consult local building codes and professionals to choose the right type of steam brake.

In summary, installing hemp fiber insulation is a relatively simple process that most home owners with basic craftsmanship skills can perform. It is important to follow instructions and take appropriate safety precautions when installing any type of insulation. For more information on mounting please refer to the assembly instructions for Ekolution hemp fiber insulation.

What preparations are required before installing hemp fiber insulation?

Preparations may include ensuring that the workplace and construction is dry and for, for example, exterior wall structures that the façade is fitted to minimize seepage of precipitation. See assembly instructions for more information

Do you need any special protective measures when using cutting tools for hemp fiber insulation?

The use of goggles and a respirator may be recommended to protect against dust and particles when using cutting tools.

Cape Verkyg

Which cutting tools are most suitable for cutting hemp fiber insulation?

For thinner dimensions 45-95 mm, a jointed tail with a daring blade is recommended. For thicker dimensions, FESTOOLS Insulating saw ISC 240 is recommended. For more information please refer to the assembly instructions.

Are there any accessories that facilitate cutting and handling insulation in the workplace?

In addition to the above-mentioned cutting tools, antigenic standing or lying isolating tables with an adjustable rail should be used. The adjustable rail shall be adjustable to any thickness and equally directly to the insulation when cutting. This facilitates cutting detachably and creates a straight and sharp cut. See installation instructions for more information on insulating tables.

How can cutting tools be used to create precise cuts to fit irregular surfaces?

By using templates and accurate measurements, cutting tools can be used to create precise cuts and adapt to irregular surfaces as well as circular blade electric saws see assembly instructions for more information.

Is it possible to rent cutting tools to install hemp fiber insulation?

Yes, many DIY stores and tool rental sites offer the possibility of renting cutting tools to facilitate the installation of hemp fiber insulation.

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