The slate roofing is a white plastic sheet, that has all the texture and detail of slate roofing. Once painted it is very realistic. I have used this companies brick for flooring and I loved it after it was painted. The roofing area is 14 7/8 wide x 12 3/4" long. Each sheet also includes two ridge cap pieces 14 7/8" long. The entire sheet is 15" x 15"."