The ultimate long-term biological prevention. A professional roofing technician utilizing specialized low-pressure soft-wash equipment to safely apply highly effective algaecide to a stained asphalt roof in Toronto.
I have a building in which there are rooftop structures that are enclosed by a 14ft high wall on all four sides. The wall is going to be supported off of vertical members with kicker braces going back to points on the roof. The mean roof elevation is around 22ft.

GRiT and Green Roofs for Healthy Cities Greenroofs.com.

Furthermore, visual representations like the one above help us fully grasp the concept of High-Rise Green Roof Lateral Freeze Prevention Methods.
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Green roofs make happier, more productive workers : TreeHugger.