One leg floorboard

An extruded floorboard apparatus comprising:

• an extruded metal body having a cross section perpendicular to a longitudinal length, the cross section including:
• a horizontal floor section having a flat top;
• a stiffening rib extending vertically from a central portion of the horizontal floor section;
• a long leg extending perpendicularly downward from a first end of the horizontal floor section, the long leg having a height and terminating in a foot;
• a short leg extending perpendicularly downward from a second end of the horizontal floor section, the short leg being shorter than the long leg;
• and
• a tongue protruding from one of the legs and forming a tee below the flat top and a U-shaped groove of uniform wall thickness formed in the other of the legs, a portion below the tee or U-shaped groove on the short leg configured to be cut off while preserving said tongue or groove,
• wherein the tongue and groove are configured such that when a tongue and a groove of adjacent extruded metal bodies are mated with each other, the short leg of one extruded metal body intimately follows but only partially extends downward along a surface of a long leg of an adjacent metal body, such that the mated short and long legs terminate in the foot of the long leg,
• wherein the long leg extends vertically down at least 7.6 cm (3.0 inches) more than the tongue, the groove, and the stiffening rib.