Exterior, Concrete Siding Material, House Building Type, and Curved RoofLine To further reduce the possibility of water seepage, a vaulted structure was used for the third floor extension, so rainwater flows down from the roof and drains away.  Photo 12 of 13 in 12 Projects Perched at the Cutting Edge of Chinese Architecture from A Vaulted Concrete Addition Protects This Sea Captain's Home