When should I double stagger panels?

For load-bearing dry fillers, you can use a single OSB board with a minimum thickness of 22 mm. For non-load-bearing dry fillers such as glass wool, you are required to install double OSB boards in two directions. Due to the double boarding, it is fully supported on the legs and almost no force is exerted on the flexible slats of the StaenisGrid. The first board, 12 mm thick, is screwed into the StaenisGrid. The second board, 18 mm thick, is screwed afterwards into the first board. The screws must be 2 cm longer than the thickness of the wooden board and may have a diameter of 3.5/4/4.5 mm.