Terra cotta roof tiles are smooth in surface, and made in a variety of shapes, patterns, textures, and colors, to cover a flat or sloped roof. More decorative terra cotta roof tiles are used to cover the roof s peak. Sometimes, the field tiles may include patterns, or a variation of clay colors.Terra cotta roof tiles are most commonly available in the famous red/orange, blue, green, deep purple, deep brown, and pale pink.erra Cotta roof tiles, although kiln baked, can be extremely delicate at times, especially during installation or after many years of weathering. For this reason, any terra cotta roof tile related services should be handled only by professionals.