In the case of raised floors, there are a few factors to be considered: the horizontal alignment of individual tiles and their flanking each other to have no joints. 
The horizontal alignment, where not well executed, will be much more visible where it is then covered with a coating (washable decontaminant mat in our case). This is, in this case, a problem with the general laying of the tiles rather than with the quality of the tile itself. The side-by-side between the tiles, resulting from the laying of the structure, where not well executed usually generates an instability of the flooring at the passage of operators and trolleys and at the time of washing a dripping of water + detergent and dirt residue in the part underneath with the problems that can easily be imagined.
Once the first two points related to the structure and its stability have been resolved, it is suggested that areas (one or more than one) be identified where washable decontamination mat (CZ) should be placed in a size useful for retention of dirt from trampling or light carts (usually 2×3m). 
In this way, decontamination areas are made and, at the same time, it will be possible to descend below in areas not covered by the mat if necessary.
CZ Mat is a high performance contamination control zone designed to attract airborne particles to its surface and decontaminate soles of personnel’s shoes and booties.