Clay is a mixture of clay and sandy components that can be considered a natural mortar. It is composed of tiny platelet-shaped particles that, when mixed with water, slide over each other, becoming plastic. When water evaporates, the platelets attract each other, creating a natural resistance sufficient for many applications in construction.
A large part of the construction materials used each year are used for this purpose, especially in new construction, renovations and modernizations, which is known as construction in existing structures.
Indoors, clay building materials are used in the form of bricks, mortars, base and finishing plasters, as well as clay panels. All of them are regulated by modern DIN standards. Other relevant uses are decorative coatings and plasters.
In addition, load-bearing construction with clay is gaining momentum: the new DIN 18940 standard regulates the use of load-bearing earth blocks for buildings up to 13 meters high (four floors).
Clay is an almost inexhaustible raw material, naturally present in the soil. In the case of ClayTec, no specific pits are dug to extract it: secondary clay is used, a surface layer that is generated during the extraction of gravel and sand. A potential waste that becomes a resource.
A large part of the planet’s soils contains clay. It is an abundant natural resource that, if not exploited, would end up being discarded. ClayTec uses materials that are already available, avoiding the creation of additional impacts.
The raw materials used in ClayTec’s products come mostly from the areas close to its production sites.
This means very short transport routes, which translates into:
This approach favors a more favorable environmental profile for the final product.
Compositional simplicity is another advantage: many products are made with just three basic ingredients – clay, sand and straw – without the need for chemical additives.
This guarantees:
Clay is, today more than ever, a construction material with a present and a future. Its versatility, sustainability and availability make it a real alternative for those looking to build in a healthier, more efficient and environmentally friendly way.
Energy consumption in the manufacture of building materials represents one of the main sources of greenhouse gas emissions and largely determines its carbon footprint. Time is of the essence: according to the United Nations Environment Programme’s Global State of Building and Construction Report , the construction sector generates 40% of global CO₂ emissions.
In this context, natural building materials, such as clay, are positioned as a more ecological alternative. Some ClayTec products go even further, as thanks to their plant-based fibre content, they not only reduce emissions, but also act as carbon sinks.
Mortar made from natural clay and other clay materials can be manufactured, stored and applied without the need for industrial drying. The moisture content of the raw material – what we know as moist soil – is preserved, reducing energy consumption throughout the process to a minimum.
The mixture of clay with sand and straw can be done using electric motors powered by renewable energies, such as solar energy, making this solution one of the cleanest and most sustainable on the market.
In cases where the clay mortar needs to be dried – depending on the type of machinery or application method – this process can be carried out at low temperatures. Unlike materials that require intensive firing or heat treatments, clay does not need high temperatures to harden.
In addition, this drying can be carried out outdoors or with solar energy, avoiding the use of fossil energy and significantly reducing the carbon footprint of the production process.
One of the most decisive factors in achieving sustainable construction is the potential for recovery of the materials used. Unlike many mineral materials that, after their lifetime, can only be crushed for secondary uses (which would technically be downcycling), clay-based building materials can be reused or recycled directly, maintaining their quality and properties.
Clay-based building materials are water-binding, which means that even after decades of use they can be rehydrated, reshaped or reused. This solubility in water gives them a unique recovery potential, and makes them ideal products for a true circular economy such as C2C (cradle to cradle ).
In this respect, ClayTec’s clay products make it possible to build without residues. The reversibility of clay-based construction systems is one of their greatest advantages compared to other materials.
Unlike traditional mineral binders such as cement, which require intensive firing processes, clay hardens simply by drying. There is no combustion or destructive chemical transformation: the clay retains its structure and, as it is not altered, it can be returned to its initial state just by adding water.
This avoids the energy expenditure of the typical cycle of calcination, milling and chemical re-setting, making clay a truly low-emission option.
Clay is a completely recyclable building material with great versatility. Not only can it be reused directly, but it can also be converted into other compatible building materials. For example, you can transform a greasy clay mortar into a lean one by adding sand or recycled aggregates, or prepare a compact clay plate from a dry mortar.
This cross-compatibility allows the material to be adapted to new functions and projects without generating waste. If the remains are recovered dry, you can even get a ready-to-apply reusable premix.
Another great advantage of clay is that it allows for completely reversible joints. A clay plaster can be removed with water without damaging the base surface; Bricks laid with clay mortar can be dismantled and reused, which is not the case with cement mortars.
In addition, even the finest components, such as sand, can be separated and recovered after decades of use. This pure separability allows not only to reuse the clay, but also to facilitate the recovery of other materials, promoting circularity throughout the construction system.
Clay building materials stand out not only for their sustainability, but also for their health-promoting properties. In a context where we spend more than 80% of our time indoors, a healthy indoor climate is a necessity and not a luxury.
Clay has the ability to absorb water vapor from the environment and release it when the air is dry, helping to maintain optimal relative humidity. This hygroscopic quality is due to its microplatelet structure with a huge active internal surface area.
Another crucial advantage is its ability to act as a natural filter: it retains and neutralizes pollutants and odors, contributing to improving indoor air quality. This feature is especially important for people with allergies, asthma, or multiple chemical sensitivity.
In addition, its porous surface and open to diffusion allows constant exchange with the environment, reducing the risk of mould formation. Thanks to this, clay is an ideal ally to create healthier and more breathable homes and spaces.
The thermal mass of clay materials acts as a heat store, regulating indoor temperatures throughout the year. In summer, it cools the spaces, and in winter, it retains heat for longer.
This ability to equalize thermal oscillations allows for a thermally stable environment, reducing the need for artificial air conditioning and improving comfort naturally.
All this is achieved without additional energy consumption, and without complex systems. It’s a perfect example of what’s known as effective “low tech.”
The interior acoustics also directly influence the feeling of well-being. Clay building plates allow you to build dry walls with excellent sound insulation, reducing the spread of noise between rooms.
In addition, clay surfaces reflect less noise than rigid materials such as concrete, helping to create calmer and more pleasant spaces.
Clay is also an excellent support for wall heating and radiant cooling systems. Its natural diffusion capacity and thermal mass allow for uniform heat distribution.
These systems operate with low supply temperature, which significantly increases the energy efficiency of heat pumps and reduces overall consumption. The result: thermal comfort with minimal environmental impact.
For centuries, clay has been a key material in traditional construction in almost every region of the world. This natural resource has been part of walls, fillings, ceilings, plaster and interior finishes, and is still present today in a large number of historic buildings.
In many cases, their use is hidden from the naked eye, for example as a roof filler or behind modern cladding. Construction with raw earth has been essential to build homes, administrative buildings, warehouses, granaries and even religious buildings, combining functionality, low environmental impact and durability.
For more than four decades, ClayTec has been working intensively in the field of architectural heritage conservation, especially in the rehabilitation of half-timbered houses. His expertise and commitment to respectful restoration earned him the prestigious German Prize for the Protection of Monuments in 1997, in recognition of his work.
Thanks to its specialisation, ClayTec has developed a technical and authentic catalogue for the renovation of historic structures with clay, including specific solutions for plastering, filling, insulation and finishing, always with the utmost respect for the original materials and techniques.
The rehabilitation of wooden structures requires compatible, stable and durable materials. ClayTec’s products, such as raw clay bricks and specific filler mortars, have been used for decades in successful conservation projects, proving both technical and aesthetic effectiveness.
For exterior façades, the company offers custom-made lime plasters, while for interiors it offers complete thermal insulation solutions and clay plasters that respect traditional aesthetics and improve thermal and acoustic comfort.
In addition, there are products suitable for renovating roofs and horizontal elements in houses with wooden structures, ensuring cohesion between old construction elements and current solutions.
In many buildings with historical value, the conservation of the original façade with exposed lattice is a legal or heritage requirement. In these cases, interior insulation becomes the best alternative to improve energy efficiency without compromising the exterior image.
ClayTec offers various interior insulation techniques designed specifically for this type of structure. These solutions are safe, effective, and fault-tolerant, both in planning and execution. In addition, its hygrothermal behaviour helps to regulate humidity, which prolongs the useful life of the wood and avoids common pathologies in poorly insulated buildings.
A notable advantage of interior insulation is its ability to quickly heat spaces, which is especially useful in traditional homes. They also integrate perfectly with surface heating systems in walls, providing uniform and natural comfort.
The restoration of historic buildings must be done with the utmost care, always looking for solutions that are both effective and reversible and respectful of the original building. ClayTec’s clay products perfectly meet this need.
Thanks to the fact that clay is soluble in water, the construction elements can be dismantled, readapted or removed without damaging the structure or altering its original characteristics. This is especially valuable in interventions where reversibility is a requirement, as it allows for flexible and precise action on sensitive elements.
In addition, the malleable nature of clay allows it to be adjusted to the particularities of each building: properties of the support, legal requirements, compatibility with existing materials, etc. This versatility makes clay one of the best options for heritage rehabilitation.
ClayTec not only offers clay-based building materials, but also provides architects, technicians and restorers with a comprehensive approach to the conservation of built heritage. Its products and solutions are designed to improve energy efficiency, guarantee interior comfort and respect the historical value of each property as much as possible .
The combination of effective insulation, technical compatibility and low environmental impact makes ClayTec products indispensable allies in interventions on protected buildings, traditional houses or historical monuments.
In short, renovating with clay is today more than ever a way of building with memory, responsibility and future, keeping alive an ancient technique that continues to offer efficient and sustainable responses to contemporary challenges.
