ground protection boards 4×8 100 tons load capacity us. 2’x8′ blue ground protection boards 100 tons load capacity That means the total width of the first supported load area extends from the end of the beam to the 3.25′ mark along the beam (1.5′ + 1.75′). The dimensions of load area 1 are 4’x3.25′ and equals 13 square feet.