Building construction system

A construction system apparatus comprising:

• a horizontal first structural beam comprising a vertically oriented first side leg integrally joined to a first base plate, the base plate adapted for abutting a structural ground surface with the first side leg extending upwardly therefrom, the first structural beam further comprising a plurality of horizontally spaced apart, first tabs extending outwardly from the side leg and joined thereto by a vertical bend line;
• a vertical second structural beam comprising a second side leg integrally joined to a second base plate, a first end of the second structural beam abutting the first base plate and the first side leg, the second side leg providing a plurality of vertically spaced apart, second tabs extending outwardly therefrom in parallel formation with the first tabs and joined to the second side leg along a horizontal bend line;
• the first and the second tabs each derived as a cut-out portion of the first and the second side legs respectively such that a major surface area of each of the first tabs is positioned vertically and a major surface area of each of the second tabs is positioned horizontally;
• and
• a vertical concrete wall poured so as to abut the first and the second side legs and embed the first and the second tabs therein such that the concrete wall and the tabs are integral for transferring forces between the concrete wall and the structural beams.