How to build a small terrace on an existing metal roof

[Novisfixaren]

Well, but they become moisture plugs and not so durable in the long run.

Ok but having some in the middle with pressure-treated wood, is it a bad idea or does it actually serve a purpose?

 

[justusandersson]

I think you should avoid it. With c/c 600 on the roof beams, it can't be that difficult to find them.