Yes, I agree with wayne, a lot of times they were coated with roofing cement. Now a days, people are actually buying them in certain colors or painting them certain color's however, I think that painting wet roofs would be hard.
They make good roofing material but, what are the prices like? Do you know of any other company/store that provides good materials for a reasonable price. I have been using scraps from when my roofing was done as my material there's a bit...
I really like the way this was done, I also really like how it's so detailed every bit of it, especially the roofing, if I didn't know any better I would've thought it was an small sized building with a perfect roof and everything. What materials did you use to make this?