Crap Installed On The Roof Covered With Shingles

Long puzzled, thinking that it is that kind of crap invented by the inventors.

Some incomprehensible crap installed on the roof covered with shingles, it is unclear pursuing a certain goal.

Thus against grassy roofs of these gizmos are also some places stick tufts of grass uncertain. What makes me think that this is not the flower pots, hurt the grass of korytets corresponds dried grass on the roof? Sense then no fuss additionally in some pots when the grass on the roof and can be so easy to grow without any care from the side.

Yes and garden on a sloping roof is as it is not logical, although practical. But inventors knowingly probably get their money, it appears!!! These things come up specifically to protect historic buildings from weed to weed not germinate in the tile roof, destroying its root system to the old buildings, and grew up in strictly designated place for him. And these traps weeds can serve as an additional shelter for homeless cats, which in China by the thousand.