2-½” Corrugated is a light gauge through fastener panel system available in 29 or 26 gauge steel with a 24″ wall net coverage and 21-1/3″ roof net coverage and is ½” deep. The paint finish is DuraTech™XL. 2-½” Corrugated is one of the oldest shapes in metal roofing. It is mostly used today to replicate the style of days gone past or to match existing projects. There are a variety of applications inside and out where this profile is used but not so much for roofs anymore.