Metal floors are grouped into two distinct categories, gratings (forge-welded and pressure-locked gratings) and perforated metal planks.

Gratings consist of a plurality of vertically aligned flat bearing bars, held upright, apart and parallel to each other at regular spacing. The arrangement of bars as described would normally provide a free space area, in excess of 70% of the plan area. 

Perforated metal planks are C-profiles formed from sheets with different formed patterns on their surfaces. These patterned profiles provide varying levels of serration on their top surfaces which in turn provides increased levels of stability to the user.