On Sep 18, 1:22 am, "Pavel314" wrote:
I live in an old farm house that has one section of fairly flat roof, it

Paul its the sun and wind that does the damage.
This time as you redo the roof stick pea shingle to the roof as you go
and the add another two inches of pea shingle right across the roof.
This will stop the ultraviolet rays from killing the roof and make it
last a lot longer, perhaps as much as 15 years.
The stones will also help to stop the wind from lifting the roof as
the suction moves over.
Note: The birds seem to like picking up the stones and dropping them
off the roof so make sure the stones along the edge are well stuck
down.
Perry