I've done this with roofing felt?
I got the idea from Mel.
Take a strip an inch wide and make cuts every inch along one edge half an inch in, to get a 'feathered' look. Glue on the bottom of the roof with Evilstick.
Add more strips as above, over lapping each half an inch so you just see the cuts. Also offset each strip to get the tiled effect.
Do both sides of the roof and cap with a strip that isn't cut.
That's how I did the roof on the building on the left of this photo..
Many thanks for your ideas the felt is like I did it years ago only the pics you posted show red tiles Les..