Exterior, House Building Type, Green Roof Material, Metal Siding Material, and Concrete Siding Material The home’s front façade features an anodized aluminum and glass curtain wall by Kawneer that's framed by Vic West black corrugated metal panels. The board-formed concrete on the exterior enables passive solar absorption, allowing optimal heat retention on cold winter days. The metal and concrete exterior cladding offers cohesive dialogue with the neighboring industrial sheds and commercial buildings.  Elgin House from The Architect Next Door