What are Radial metal roofs? Radial is another word for spiral, or curved metal roof. This can be seen in the picture to the right. Radial metal roofs simply have a curve in the design. Although they can be difficult to install, IronClad Roofing has plenty of professional experience and knowledge to ensure a specialty roof like this is installed correctly. We can ensure that your curved metal roof will provide the protection it should while inspiring awe with its beautiful design. They are typically installed over archways, canopies or as walkway covers, but they may cover the entire roof. These specialty roofs demand esteem with their wonderful aesthetic appeal.