Back Yard, Exterior, Concrete Siding Material, House Building Type, and Flat RoofLine The defining gesture of a house on the Big Island of Hawaii by architect Craig Steely is a 139-foot-long, four-foot-tall concrete beam spanning the roof. Owners Craig Mayer and Rick Penland relax on the lanai, or porch.  Photo 2 of 25 in 25 Modern Homes That Kill it With Concrete from This House Conquers the Big Island in Hawaii