The grey slate roof has been painted. I have used a variety of different acrylic paints to get a mottled finish and then drybrushed and washed the roof before adding streaks and mould.
In addition I have painted the grey stone steps to the side in a pale grey colour with other details such as the down pipes and hand rail painted white.
The small manhole cover to the rear was modelled from some textured plastic card and painted dark grey with graphite pencil used to add a metallic sheen.
I will be looking to sell this model - if any reader is interested in purchasing it, please contact me via the Blog.