In house assembling a divider is generally developed from an internal leaf and an external leaf with a cavity therebetween in which a protecting layer can be organized. The inward leaf and external leaf can be shaped from laid squares or blocks, in spite of the fact that it is additionally normal these days to encapsulate the internal leaf as a substantial piece, which is generally produced in a production line. In this last case the made substantial chunk is shipped to the building site, raised there, after which the protecting layer is orchestrated and the brickwork of the external leaf is laid.