The most popular and most versatile of the roofs. By using trusses with different cross-sections can build roof of any size. Using aluminum trusses QUADROSYSTEM 290 can be to roof scene dimensions: 8m x 6m, 8m x 8m, 10m x 8m, QUADROSYSTEM 350 is best suited to the scenes of medium size: 10m x 10m, 12m x 10m, 12m x 12m, while using QUADROSYSTEM 400 and QUADROSYSTEM 750x400 successfully we can get the dimensions 14m x 12m, 14m x 12m, 16m x 14m, etc., until reaching the dimensions of 20m.