Exterior, Metal Roof Material, Metal Siding Material, Wood Siding Material, Flat RoofLine, and House Building Type An exterior shot shows the site-built garage along with two adapted prefabricated modules. The one above the garage houses the kitchen, home office, and living room, while the other contains the home’s bedrooms. Exterior materials include sustainably harvested cedar rainscreen; HardiePanel made from recycled materials; and standing seam metal siding, known for its longevity and energy efficiency.  Photo 4 of 9 in What it Really Means When a Home Has Good Bones from This Green-Minded Prefab Treads Lightly on the Earth