Quote:
Originally Posted by RobFrost
Paving should always have a slope. Moss and mildew may be because of insufficient slope, resulting in water not running off.
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You did say paving and IDK why "paving" is any different. Ever seen a north facing roof that is not in the desert? Any type. At least in m experience all pitches of roofs of all types can have mildew, moss and algae in shady and damp areas.
Hardscape is no different no matter what material. Bricks and such may have good run off but bricks are like a sponge. Simple maintenance can keep these areas clean.