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Cat poops tho :D
The substrate / density of most seedum puts them off, it seems - They just don't crap there. They sleep there instead.
The worst I've seen on either of my 2 growing roofs is some sort of owl pellet, and whole eggs / walnuts buried by the local idiot squirrels.
Seedum roofs are heavy though (up to 100kg / m2) - you'll need to check that the roof is able to support it without deflecting too much.
NotThamesWater
Cat poops tho :D
Keeps the plants nourished I guess!
Good shout though.