In pre engineered buildings have all its structural components manufactured in a factory, following which they are transported to the construction site for assembly and installation. This ensures that construction process happens faster.
The structural design of a PEB consists of a primary frame which is made from steel. Then there are secondary frames like girts, purlins, etc which provide support to the primary frame. The wall and roof panels on the other hand are made of single skin steel sheet or insulated sandwich panels, depending on the requirement.