Very slight pitch flat room (no peaks)

You will need to use a special type of metal roofing which is specially-seamed once the panels are on the roof. There are a number of names attributed to this type of product including "Field-seamed," "Mechanically-seamed," "Double Lock," and "Triple Lock". You can use this website to look for a metal roofing contractor in your area who does Vertical Seam panels and then see whether they offer these types of products. Or you could use other resources to find someone specializing in commercial "flat" metal roofing.