Exterior, Wood Siding Material, House Building Type, and Butterfly RoofLine WDA demolished a 1950s tract home to built a brand new, two-story, 4,898-square-foot oasis with five bedrooms and four-and-a-half-baths. Topping off this Silicon Valley home is an asymmetrical, Le Corbusier-style butterfly roof that gives the home its distinctive form while creating soaring spaces on the second floor.   Photo 1 of 13 in A Silicon Valley Retreat Sports a Butterfly Roof and Two Indoor/Outdoor Wings