Raw earth plaster: characteristics and advantages

Raw earth what it is


A very old material is the raw earthan unfired clayey earth.
The power of clay is to take on plastic characteristics when it comes into contact with water so as to become a reading.


It can be combined with any type of vegetable fiber, optimizing its performance.
According to the parameters of theLCA (Life Cycle Assessment), raw earth has an extremely low environmental impact, in fact, the amount of energy consumed for its production is minimal.

In the building sector, the material can be used as:

  • masonry of collision;
  • fills;
  • screeds;
  • partitions e dividers;
  • finishes e plasters.


The raw clay in recent years is making more and more space in the field of green buildingthanks to its ecological and sustainable characteristics.

In this article we will focus onraw earth plaster to understand what are the reasons for choosing this material.

Raw earth plaster


Raw earth plasters are able to stick to any support.
In the case of wooden buildings they are able to donate greater thermal inertia and mass, higher humidity regulation and fire protection.

Type of clay plaster
When combined with plant fiber panels, it offers a wide range of solutions for types of ventilated walls.

Raw earth plasters components


Raw earth plasters are characterized by inert e clay.
The latter acts as a binder of the soil and is the smallest part that is formed by the disintegration of the rocks. Unlike the type of rock, a clay with different properties will be created.

The inert minerals they are divided into gravels (up to 6 mm thick), sands (up to 2 mm thick) and silts (from 0.02 to 0.002 mm thick) and their task is to fill voids.

For a lightening of the mix, if you were faced with a thermo plaster, they are inserted vegetable aggregatessuch as straw fibers, which also help to dampen the shrinkage phenomenon.

You can also add additives to improve its characteristics.


The mechanical strength of the plaster is due to an exact proportion between aggregates and clay and to a correct hydration.

The proportion differs according to the thickness of the plaster: a reduction of the latter leads to an increase in the quantity of clay.

Where to apply the clay plasters


It is possible to apply raw earth plaster on any surface following a adaptation if the supports are not suitable.
For example, in the case of reinforced concrete or wood, a background so as to improve the surface.


The most suitable support is the one that ensures perfect adhesion between the plaster and the wall, such as the adobe wall or the pisé, which do not need to use external supports.

Advantages of clay plaster


The raw earth plaster possesses countless advantages which make it an attractive product for sustainable building constructions.

Let’s see what they are in detail.

Ability to absorb moisture


The raw earth plaster is hygroscopicthat is, it has a high capacity to absorb humidity, acting as a real dehumidifier.
In the event that there is a strong excess of humidity, the wall will absorb it and then return it when the air is dry.

Completely natural and plastic material


Raw earth needs low energy for its production process and does not generate any type of waste.
In fact, it is possible to reuse it by wetting it and giving it a new shape.

Furthermore, the clay does not need cooking or chemical transformations as it naturally possesses plastic properties.

High thermal inertia


The clay, thanks to the high volumic densityhas the ability to absorb heat and return it over time, a property known as thermal inertia.
It is necessary that a house has excellent thermal inertia in order to guarantee well-being to the inhabitants.

Reduction of indoor pollution


Often inside our homes the phenomenon ofindoor pollution. In fact, many building materials can release VOC substances that are dangerous to human health.

The raw earth plaster, thanks to its natural components, cancel the danger of becoming a polluting source.

Aesthetically pleasing and elegant


Last but not least advantage is his aesthetic quality.
The raw earth plaster is able to create very beautiful surfaces by integrating the component of healthiness.

Coating with raw earth plaster


The plasters Terracruda from PRIMATE they are in perfect harmony with the environment.
Without any additives, they are capable of regular the internal temperature giving a unique well-being and comfort.

Thanks to plasticity and to workability clay it is possible to create a wide range of finishes.

Terracruda single-layer intermediate plaster
Terracruda offers different types:

  • The base plastersfrom thickness up to 8 centimetersare useful for the construction of structures with high thermal inertia.
  • The intermediate single-layer plastersfrom the thickness between 1,5 e 2 cmon the other hand, they are applied on sight.
  • The finishing plastersthen, have a thickness of 3-4 mm and they are in different colors and effects.

Type of raw earth plaster


A type of clay and aggregate plaster is proposed by clay group.

Installed on walls and ceilings using a trowel, to avoid cracks in the vicinity of different materials or joints, a mesh reinforcement is inserted. glass fiber.

Geosana precious raw earth plaster
The precious raw earth plaster Geosana it has the ability to naturally regulate humidity, avoiding the creation of mold.
It is a completely product recyclable and easy to work with, also excellent for kitchens and bathrooms.

In addition to possessing a finish from the properties breathablehas the power to neutralize odors and not retain mites.


Source: LAVORINCASA.it by www.lavorincasa.it.

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