c purlin vs z purlin
In architecture, structural engineering or building, a c or z purlin (or historically purline, purloyne, purling, perling) is a horizontal beam or bar used for structural support in buildings, most commonly in a roof. Purlins are supported either by rafters or the walls of the building. They are most commonly used in metal buildings, though they sometimes replace closely spaced rafters in wood frame structures.
http://www.metalrollingmachines.com/blog/the-difference-between-c-purlin-and-z-purlin.html C purlin or Z purlin is shaped like a letter Z. Z purlin shape allows the purlin to overlap with others at the joints. This gives Zed purlins the potential to be much stronger than C purlins. They are mainly used in walls or for large roofing projects.
Z Purlins are made using cold-formed or rolled sheets for supporting roof. The flexible shape of these beams facilitates various designs solutions. These purlins are extensively used in huge roofing solutions such as godowns, workshops, industrials sheds and many more. The range is known for saving up to 50% on structural sheet in comparison with hot rolled angles. Z purlin should be crisp and clean in design and do not allow the scope of inaccurate lengths.