Special bidirectional fabrics are open mesh fabrics made with spikes (including in all four sides) that allow both drastically reduce the incidences of reinforcement due to the overlaps, as highlightened in the data sheet below, and also to respect the alignments of the reinforcement planes.

In addition, the contractor no longer needs additional processing, such as cutting panels in the areas where they overlap in order to comply with casting thickness, with a significant reduction of installation times.