Billboard with steel structure

Angle steel can be used as advertising rack material. The design of advertising rack needs structural calculation, mainly wind load.

According to your request, my thoughts are as follows:

Using expansion bolts or planting steel bars (I recommend planting steel bars) and then making embedded parts waterproof, in fact, it has little effect on roof waterproofing. Or if the roof has enough bearing capacity, press the advertising rack with heavy objects.