Lathe metal roofing?
that type of metal roof is usally sold in 29 gauge, you can get it in 26 gauge if you feel it's worth it. You must tear off the roof on now, even though the sales people say you don't have to. You must have solid decking. I've installed plenty of these roofs mostly in the mountains, on cabins, and summer homes. Their very popular, and come in many colors. Ther are some tricks to know installing this roof, like you must take every nail out that will not lay flat, after you tear off the old roof, as this roof will transfer any bump right through, and you will see it, especialy on a steep pitch. That means no cap nails used on the paper either, you can only use small stapels to install the paper, (hammer tacks), or you will see every nail! The screw pattern is every 9" across and every row is every 2ft. up-follow me? Look at where the screws are to be installed, There is a sheet showing screw placement. The paper you use had better be 30lb type 2 (heavy)