Z Scale - Coal Loading Facility. Supports on roof to install the type roofing you wish. Corrugated metal, tar paper, etc.
Go to:
https://www.shapeways.com/product/Z7K7UZ7WA/z-scale-coal-loading-roofing-panels if you'd like to use corrugated panels for the roof.
Not intended for children 14 years of age or younger.