Planned lightweight filling application for the Student Activities and Athletic Facilities (SAAF) was either foam (aerated) concrete or some other sort of lightweight concrete. The area to be filled had various slopes, hence any application was very complicated and required careful planning. After long reviews and discussions, ABS Plus disposable formworks were preferred as the optimum solution for this area. First, ABS Plus disposable formworks guaranteed the lightest solution since the system created a 95% void space under the covering slab concrete. Second, every pipe was cut to the size required by the original design constructing perfectly aligned slopes. Third, using ABS Disposable Formworks was by far the most economical solution.