Steel structures for roofs and canopies are among the most requested products in fabrication, but their apparent visual simplicity hides technical variables that, if not properly accounted for, produce quotes a long way from the real cost.
The span determines the sections
The wider the distance between supports, the heavier the structural sections must be to carry the load without excessive deflection. Applying the same standard section regardless of the span is a mistake that can compromise both the cost and, more seriously, the safety of the structure.
Snow load is not uniform across the country
Design snow load varies significantly by geography and altitude, and a structure sized for a low-load area can be wholly inadequate elsewhere. That technical figure should always be verified for the specific location of the job, never assumed generically.
The roofing chosen changes the supporting structure
Lightweight polycarbonate roofing needs a different supporting structure from heavier insulated sheeting. The weight of the roofing the customer chooses adds to the load the steel structure must carry, and always belongs in the sizing before a price is fixed.