Why retrofit and insulate with hemp blocks from the inside ?

Comfort, breathability, and performance: hemp blocks adapt to all renovation projects.

Whether it's a listed building, a historic residence, a timber-framed house, or a stone building, they guarantee optimal interior insulation for future generations.

Their versatility meets current challenges: thermal protection, reduction of energy consumption, remarkable longevity, and low carbon footprint.

Choosing hemp blocks means opting for insulation that respects heritage and the environment.

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Insulating from the inside with hemp blocks, a complete solution.

A complete and easy-to-implement solution for unique interior comfort and incomparable durability:

  • Hemp blocks: Choose from a wide range of thicknesses from 7 to 36 cm.
  • HL Mix: Fill the irregularities of your old walls with our insulating plant-based granulate.
  • Lintels: Facilitate your openings and passageways.
  • Finish: Choose the finish that suits you.

Our complementary products

A recognised and certified material.

A material recognised and certified by numerous labels and technical approvals.

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The advantages of hemp blocks for interior insulation.

  • High thermal performance: Reduce heat loss and improve the energy efficiency of your building.
  • Moisture regulation: As a breathable material, hemp naturally regulates humidity, preventing condensation and mould problems while preserving old buildings.
  • Acoustic comfort: Enjoy superior sound insulation for a peaceful indoor environment.
  • Bio-based and durable material: Made from renewable raw materials, hemp blocks are part of an ecological and sustainable construction approach.
  • Easy implementation: Their lightness and size facilitate quick installation, ideal for renovation sites.
  • Exceptional lifespan: A lifespan of 150 years, which is 6 times longer than conventional insulation.

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The technical performances of a renovation with hemp blocks.

Hemp blocks ensure excellent thermal regulation thanks to their ability to absorb and diffuse heat. This helps maintain a constant indoor temperature, limiting variations due to external conditions.

Key technical data :

  • Lambda value (λ): 0.071 W/mK

  • Thermal resistance (R): up to 5.37 m²K/W for 36 cm blocks.

  • Thermal phase shift: up to 23.6 hours for 36 cm blocks, reducing the impact of temperature variations.

Thanks to their permeability to water vapour, hemp blocks naturally regulate humidity, creating a healthy and consistent indoor environment.

Key technical data :

  • Water vapour resistance factor (μ): 2.8.

  • Equivalent diffusion thickness Sd: up to 1 m for a 36 cm block, promoting wall breathability.

Hemp blocks offer remarkable acoustic insulation, effectively absorbing and attenuating noise, for a quieter indoor environment protected from sound pollution.

Key technical data :

  • Acoustic absorption (α): Coefficient of 0.85 (high sound absorption).

  • Acoustic attenuation (Rw): up to 44 dB for a 36 cm block, significantly reducing external noise.

Hemp blocks are highly fire-resistant, emit no toxic fumes, and offer increased safety in case of fire.

Key technical data :

  • Fire resistance: from 240 minutes for blocks of 30 cm or more to 45 minutes for 7.5 cm blocks.

  • Fire reaction class: B, S1, d0. The hemp block does not emit toxic fumes or flaming droplets.

Hemp blocks are the epitome of a sustainable solution, combining remarkable longevity with a reduced environmental footprint. This bio-based material ensures reliable and environmentally friendly construction.

Key technical data :

  • Bio-based and low-carbon material: Hemp is a renewable resource that helps reduce CO₂ emissions during construction.

  • Exceptional lifespan: Thanks to their robustness, hemp blocks maintain their performance for decades without needing replacement.

Implementing hemp blocks in interior retrofitting.

  • Time-saving: Implementation is faster than with loose-fill insulations or systems requiring a framework.
  • Thermal bridge management: Thanks to their moisture-regulating capacity, the thermal weaknesses inherent in interior renovation projects are perfectly managed, unlike conventional insulations.
  • Stability and durability: The performance of hemp blocks remains constant over time, without settling or degradation.

Our DIY videos

Technical documentation.

Find here all the technical resources you need to better understand interior insulation with hemp blocks and its specifications.

Folder - Renovation - IsoHemp

Hemp blocks for naturally efficient masonry , PCS, our natural interior plaster, Complementary products for hempcrete blocks.

Folder

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Installation guide - Hemp Blocks - IsoHemp

Hemp blocks for naturally efficient masonry , Hempcrete, Complementary products for hempcrete blocks.

Installation guide

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Technical data sheet - Hemp block - IsoHemp

Hemp blocks for naturally efficient masonry.

Technical data sheet

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Technical Approval - ATG

The Technical Approval ATG, issued by the UBAtc, is a certification that confirms our products meet the highest standards of the Belgian market.

Technical data sheet

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Other sections and schematic diagrams are also available upon request.

Do you have any other questions? Contact us!

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Each project is unique.

Contact us to define the most suitable solution for your renovation.

Our team is at your disposal to advise you and together find the ideal solution.

Our achievements retrofitting by the inside.

Discover our projects successfully completed thanks to IsoHemp hemp blocks in interior insulation.