Fabral® Hefti-Rib® is a classically designed exposed fastener panel. With exceptional durability and unlimited color options, Hefti-Rib® is the preferred choice for function and creativity. The unique construction of Hefti-Rib® allows panels to follow every curve of your design. And it's suitable for use on both wall and roof applications (in siding only, can be applied in vertical and horizontal orientation). With Hefti-Rib®, your vision is limitless.