Non-metal building materials, namely, casting forms for cementitious material for use in the construction of drainage and drainage trench forming systems, namely, drains, grated line trenches, trench drains, drop inlets, catch basins, utility chases, oil-water separators and other voids in cementitious placements; concrete drainage channels, vertical drainage channel extensions for surface drainage; and components of non-metal drainage channels, namely, locking inserts