GOT OUT OF BUCKET ON THE LIFT AND STOOD ON A TANK THEN STEPPED OVER ON A 1 1/2"" INSULATED PIPE THAT RAN DOWN THE WALL NEXT TO WHERE THE SIDING WAS BEING INSTALLED. THE BRACE THAT HELD THE PIPE PULLED LOOSE FROM THE WALL AND HE FELL APPROX 11'6"" TO A CONCRETE FLOOR. WE'RE NOT SURE IF HE HIT HIS HEAD ON A METAL TANK OR THE CONCRETE. HE WAS LYING ON THE FLOOR IN A SPOT APPROX 5'6""WID