Corrugation
Corrugation is multiple parallel folds or ridges that gives extra strength to a material. It is used in siding and roofing. The first known corrugated metal was made in the 1820s. Corrugation is used in making cardboard. It protects items that are being shipped.
![Picture](/uploads/5/0/7/1/50715611/624444724.jpg?354)
Why it is important
Corrugation lets you keep your material lightweight with a high strength-to-weight ratio.
Photo used under Creative Commons from Alan Langford