While the same effect could be done using modelling supplies I wanted to try using cardboard to make a really pointy spire. The long term advantage is that the same technique can be used for round spires or any other non-flat roof element.
Progress so far:
Probably should have started with something smaller but I didn't want to make something smaller.
The overlapping tiles are quite strong though in future I'd start with a stiffer backing to get a neater finish though this will end up looking like an old slightly sagging roof which is also good.
The tiles are punched out using a label punch, mine came from Stampin Up! in the USA. They're then cut to size - these are about 2cm long - and glued with craft glue.
I changed the spacing between the tiles after doing the first skirt as they were overlapping too much (7mm spacing). I'll continue with the overly overlapping tiles on the skirt and use the better spacing (1cm) on the tall part. Tiles also have a slight gap between them so that they'll stand out once painted and the tiles on the playmobil roofs have this gap.