Curveline Inc., Ontario, Calif., offers custom-curved mansard systems in dozens of different profile configurations. The customer may select from a wide range of exposed and concealed fastener panels offered by leading panel manufacturers around the country, and then specify the desired radii and angles of curvature. The curving process adds considerable strength and rigidity to the metal, creating mansards with no need for a solid substrate underneath. In most cases panels only require support at either end, with no additional framing in between. Mansard systems in 24- or 22-gauge metal may be used for all types of new and retrofit construction.