Clay roofing materials are commonly ________________, whereas clay siding material is typically _______________.

Clay roofing materials are commonly curved because they are often shaped into tiles, which helps with water runoff and adds an aesthetic quality to the roof. This curvature also contributes to the structural integrity of the roof, helping to withstand environmental elements. On the other hand, clay siding material is typically flat. Flat clay siding is designed to provide a smooth surface that can be easily installed and is often used for wall applications in residential buildings. This distinction in shape is important as it reflects the materials' functions and design considerations in construction and architecture.