What are the three primary designs roofs are constructed in?

The primary designs of roofs include pitched, curved, and flat configurations. Pitched roofs, commonly seen in many residential structures, are characterized by their sloped surfaces that facilitate water drainage and snow shedding, thus preventing structural damage. This design is highly effective in regions experiencing significant precipitation. Curved roofs, which can be found in modern architecture and stadiums, offer aesthetic appeal and structural integrity, allowing for unique designs that can also help with rain and snow runoff. Flat roofs are typical in commercial buildings and certain residential designs, providing usable space on the roof and ease of maintenance, although they require careful consideration for drainage to prevent water accumulation.

The combination of these three types sufficiently covers the vast majority of roofing styles encountered in various buildings, reflecting their essential roles in architecture and environmental adaptation. The other combinations mentioned do not adequately represent the broad range of roofing designs commonly in use today.