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Exterior, House Building Type, Wood Siding Material, and Gable RoofLine The fire-resistant structure is clad in corrugated Cor-Ten steel that has been left to rust for easy maintenance. Instead of fussy landscaping, the family spread seed for native grasses and wildflowers that they let fill in naturally.  Photo 4 of 7 in Sustainable Retreat on a Fire-Devastated Site in Boulder