This has been much on my mind recently as we are having a house built. The old roof had some sort of cementitious 'clay' tiles on it that grew an unbelievable amount of moss and the gutters were always full of it.
It is actually bad for roofs.
Concrete tiles are the worst. As well as looking horrible they also take up twice as much water as clay or slate, so grow more moss generally. They also weigh twice as much as clay or slate to start with. The moss holds even more water and keeps the tiles from drying out which can cause frost damage, wicking and whatnot.
You can get copper tape to put along the ridge lines to prevent moss. Our new roof will have it if I don't forget. I'm going to use clay tiles anyway which shouldn't be anywhere near as bad.
I haven't actually bumped into a lamp post yet but I probably will. I spend most of my daily walk looking upwards at roofs and windows.
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odd solution! new
odd solution! new