Earth materials
Strengths of unburnt clay:
- Natural material, recyclable, after the end of its lifetime fully returnable to nature;
- Creates healthy internal environment which is favourable not only for asthmatics (keeps the microclimate featuring a steady temperature and humidity – significantly reduces illnesses from cold, in a sufficiently thick layer provides protection from electrosmog, absorbs odours);
- Low energy demands – minimum in-built energy, both for production (40% less than in the case of burnt bricks) and transport (with regard to local availability of materials)
- favourable effects on human psychical welfare (rammed non-plastered walls in hospitals, psychiatric clinics, chapels, etc.);
- Loam constructions are able to accept very quickly a high content of air humidity, and after the cessation of the cause of the humidity release into the atmosphere (e.g. from the bathroom, from the kitchen, etc.) they are able to gradually release water vapours back to the internal environment, whereby it is possible to maintain the microclimate with an optimum humidity of 50%;
- Most loam-based building technologies make it possible to implement the construction in a do-it-yourself manner, which means that only minimum qualified work is necessary to carry out the construction;
- Loam preserves wood thanks to the low equalising humidity which is passed by means of a capillary effect;
- Heat accumulation
Drawbacks of unburnt clay:
- Low resistance to water effects in all physical states, which means that this material is not suitable for inundation areas, it is not a suitable material for outdoor rendering not protected from rain either
- A specific shortage in our country is the fact that building firms usually ignore this material.