How to build a single-board shed with a span of12m? Under the guidance of the teacher.

Are you going to make a simple house or a color steel shed? Veneer or composite sandwich panel? For veneer, herringbone beams and purlins, 40*80*2 square steel pipes can be used, and for columns, 80*80*4 square steel pipes can be used, with a span of 5 meters and a color steel thickness of 5 mm If it is in the north, the specifications of snow-loaded trusses can be increased.