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Exterior, Metal Roof Material, Metal Siding Material, Brick Siding Material, and House Building Type The den, originally and enclosed porch off the back of the house, was one of the biggest energy-sucking culprits. The designers opened it to the rest of the house to improve circulation, added a pentagonal Weather Shiel window, and clad the structure in metal panels matching the roof.  Photo 3 of 5 in Steel Preserve