Re: Coating loads.. Hello; It will be more appropriate to use the same pipe profile as the crosses for your stability beams. In these beams, you can model their junction with a cross-end joint. The spacing of your purlins is 260 cm. Depending on the type of your coating, this number of purlins may not be reasonable. The period of your structure is all about stability on the roof, it would be good to increase the cross section in your main beams. For wind loads, you can use the values calculated by the program with TS 498. If the engineers who will control your project especially want to see the TS EN, you can make the calculations and effect on the coating. In the attached project, I increased the number of purlins, but increase the cross-sections of your main beams, model the cross-sections of your cross beams in the same way and the cross-sections of your stability beams as the crosses. After these changes, the period of the structure will be suitable enough. Good work.