Processing the

Hempcrete blocks

Ideally suited for self-application


The all-rounder for your healthy home

The Hempcrete block is used almost everywhere in the house:

As an external wall, directly insulating masonry,
as a partition wall and inner acoustic wall,
as full thermal insulation of existing structures as well as of new buildings,
as floor insulation,
and in the renovation of old buildings.


Hemp stones are not only very easy to process when cutting and milling. The conventional hand saw, circular saw, band saw, saber saw, aerated concrete saw, alligator or a normal milling machine can be used.
A hard metal or iron blade is best for this. An alligator or a band saw are best for efficient and clean work.
Moistening the hemp stones makes cutting easier.

High temperatures and dry air can cause the lime mortar to burn if it is absorbed too quickly. Therefore, when plastering at over 30 ° C, the block is also briefly moistened beforehand. Do not wall at temperatures above 35 ° C or below 5 ° C.

In the case of external walls and walls on a damp subsurface, a wall barrier tape is laid under the wall. The wall must be absolutely and perfectly protected from rising damp.

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Hempcrete blocks in renovation

Since Hempcrete blocks are very moisture-tolerant and moisture-regulating, prevent mold due to the high pH value and have good insulation values, they are particularly suitable for renovations and for energy-efficient renovation measures.

Due to the high diffusion openness and the high pH value of the lime, no moisture barrier is used for interior insulation. The resulting condensation or condensation does not affect the material. The hemp absorbs so much moisture that there will be no loss of condensation - but even then the hemp block would still insulate. Hemp-Lime insulates even when it is damp. The moisture is transported in a capillary manner and by diffusion.

Due to the excellent properties in terms of air purification and moisture regulation, Hempcrete blocks are very suitable for partition walls.
Since the structure of Hemp block is very inhomogeneous, disordered and composed of different densities, sound waves are effectively interrupted and the sound transmission is reduced. Room sound is also absorbed very well due to the coarse surface.With a double wall system you can achieve a sound reduction of up to 57 dB.

Hemp block in a wooden frame


Hemp block in half-timber

Hemp block as a partition

Hemp block walled in support structure     Hemp block walled without                                                                                                                      support structure

Maximum height of the Hemp block wallwithout additional security

Maximum width of the Hemp block wallwithout additional fastening

Plastering the surface

Hemp blocks must be plastered with breathable materials (e.g. the Hessler Lime plaster system). The ideal paints for painting are sump lime paints or clay paints (interiors).
Plaster structure inside:
Moisten the wall before plastering
Plaster Hessler HP 9L Lime base plaster approx. 1.5 cm thick
Hessler HP 90 lime finish plaster as final plaster (approx. 1.5 mm) or equivalent products.
Clay plasters can also be used inside.
The plaster should always be cement-free and be highly permeable.
Plaster structure outside:
Moisten the wall before plastering
Plaster Hessler HP 9L Lime base plaster approx. 1.5 cm thick
Hessler HP 90 Lime finish plaster as final plaster (approx. 1.5 mm)
Exterior paintwork should be done with silicate paint. Prime with Siofix, paint with Siophob (if there is enough weather protection through a roof, Lime paint is also suitable).
The base area must be protected from water, I.e. with an addition of 10% Roman Lime to the HP 9L.
Reinforcement mesh is suggested over the entire surface for renovations; for new buildings only at key points (wall-window, wall-door, etc.). 
The HP 9 L is also used for masonry; thanks to the lightweight aggregate in the mortar, the joint does not represent a thermal bridge here.


In the case of interior and exterior insulation, the hemp blocks must be mechanically attached to the existing wall (insulation dowels, 4 pieces per m²).
The existing wall must be statically stable and bear the weight of the insulation. Note the maximum widths and lengths!

"Normal" size windows can be mounted directly on the Hemp blocks with a wooden frame. The wooden frame is fixed to the wall with 8/80 screws.In the case of "larger" windows, the skeleton is planned to the left and right of the window openings and the windows are attached to them, as are the Hemp blocks.Lintels are made from wood or as conventional brick lintels.

Toilets, sinks, kitchen wall units, radiators and similar heavy objects are mounted on the skeleton.

What else should be noted ...

Hemp blocks must be protected from rain both during transport and on the construction site.
At the end of the day, the last row of bricks at the top is protected from rain, as are open pallets.
During the construction phase, the wall is protected against water from above (ceiling, roof) and the water is directed away from the ceiling, etc. so that the wall is not soaked.
When transporting all hemp stones must be tied under the tension belt.
Angle used to protect the edges.

As easy as it sounds ...

order our sample box with a full-size block and the information brochure now