Обрушение навеса. Ошибки строительства

Collapse of the canopy. Mistakes in the construction of carports.
The canopy collapsed. Installation of polycarbonate.

A) There are two options for supporting polycarbonate with a frequent run (the joint of sheets anywhere) or on the upper belt of trusses, then the joint should be strictly along the belt.
B) The weak point of polycarbonate is the deflection perpendicular to the slope, because
there is no rigidity there, and with improper installation (design), this will primarily lead to its destruction.