The choice of the right stone is made by four main criteria: the type of home, the type of processing, thermal properties and compressive strength. The process is always glued. The other three criteria are indicated by the specifications drawn up by the architect / engineers. To meet those criteria and stay commercially reasonable priced we have several partners who provide us with a high standard quality and CE approved blocks. Except blocks of different sizes, they can be smooth or ribbed, have high or slightly lower insulating properties and contain from 10N to 30N compressive strength. Together with the client we determine what meets up with the requirements.