What is the load-bearing structure of the roof

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The supporting structure of the roof is part of the roof that ensures its stability, strength, required bearing capacity, stiffness and durability. The load-bearing structure must safely transfer all loads. The supporting structure of the roof must not be damaged or unstable.
The design of the roof or any other structure must be handled correctly, as well as the prescribed materials. Otherwise, the roof of the house is unstable and will fall.