Most of our work is standing seam metal roofs. These are roof panels that are generally 16" wide with a 2" tall leg on each side. Clips are screwed to the roof along the leg of the panel and then the next panel put on. This type of roofing has no penetrations, as all fasteners are concealed under the panel. This reduces chances of leaks because there are no screws penetrating the panels for water to follow through.
The BattenLok HS panel by MBCI shown above demonstrates the standing seam panel. The panel shown has both pencil ribs and striations. The pencil ribs are the long narrow raised ribs on the panel surface. Striations are low, wide raised strips on the panel surface. Both make the panel stiffer, reducing oil canning, or warping that may occur after the panel has expanded and contracted from changes in temperature.
Exposed Fastener Panels
There are also screw down panels. These panels overlap on the edges and then are screwed through the panel. This is a cheaper option than the standing seam, but also has a slightly higher chance for leaks. This is a good option for residential buildings and barns. The GrandRib 3 by Fabral is an example of a screw down panel.
Some of the manufacturers for standing seam metal roofs we frequently use are listed below. You can find more information on panel profiles and color charts on their websites. There are also pictures of standing seam metal roofs and wall panels.