With most available modular wall forming systems offering pressure ratings no higher than 1650 psf, EFCO made news at World of Concrete 2001 when it introduced a new modular form system designed to handle 2400 psf lateral pressure.
How can this system be so stiff and strong, yet weigh only 20 pounds per square foot? First, the entire form is made of 50 ksi steel. Then, the supporting edge walers and internal stiffeners are designed with numerous holes through the ribs and that are carefully sized to permit them to develop the required strength with less weight. Ties are set back from the perimeter of the form, another factor contributing to its lower weight.