also called “floating floors”, are modular systems traditionally used for the flooring of interiors and that today are also being used for outdoor applications. Devised to solve the problems relating to office planning and to create an easily accessible gap below the treading surface, this system consists of: a bearing structure, a support panel and surface cladding, for which rectified porcelain stoneware slabs prove to be perfect. These floors are often completed using 60×60 cm slabs, but they can also be made to adapt to other sizes, ranging from 30 cm to 120 cm. 

the rectification is a process in which the tile edges are perfectly squared. In this way it is possible to install adjacent tiles with minimum grout lines. Rectified single work-size tiles mean that the tile edges are perfectly straight and with a single size of sides regardless of different production lots.

it determines the resistance of the glaze surface (glazed porcelain stoneware) to withstand wear and tear. According to ISO 10545-7 standard, tiles are divided into five grades depending on their destination of use:

1. PEI 1: Products destined for areas exposed to light traffic with no abrasive dirt, for example: bathrooms, bedrooms.
2. PEI 2: Products destined for areas exposed to medium traffic in presence of abrasive dirt, for example: study, living rooms
3. PEI 3: Products destined for medium-high traffic in presence of strong abrasive dirt, for example: halls and kitchens in residential venues.
4. PEI 4: Products destined for areas exposed to high traffic, for example: restaurants, offices, shops, public offices (except for floors that are installed below cash desks and public paths).
5. PEI 5: Products destined for particularly high traffic venues.