When should I double skid plates?

With load-bearing dry fillers, you can use a single OSB plate of at least 22 mm. . With non load-bearing dry fillers such as glass wool, you are obliged to place a double OSB in 2 directions. Due to the double plating, it rests completely on the legs and there is almost no force on the flexible battens of the Staenis grid. Screw the first plate 12 mm thick into the Staenis grid. The second plate 18 mm thick is screwed into the first plate afterwards. The screws must be 2 cm longer than the thickness of the wooden plate and be 3.5/4/4.5 mm in diameter.