(1) Structural steel sections used in foundations shall have a concrete cover with thickness of at least 75 millimeters, and all spaces between adjacent sections shall be filled with concrete, Grade 20.

(2) Except where a foundation comprising structural steel members surrounded by concrete has been specifically designed to act as a reinforced member as a whole, the concrete casing shall not be taken into account in determining the stresses in the structural steel members, which shall be designed in accordance with the provisions of Chapter 3.

(3) Structural steel beams used used in a grillage foundation shall rest on at least 200 millimeters of concrete of the grade specified in subsection (1).