(1) Every building or portion of a building shall be designed and constructed to sustain the most adverse combination of dead loads, superimposed loads and forces to which it may reasonably be expected to be subjected, which loads and forces shall be taken to be not less than minimum set out in C.A.S. 160, Loads and forces.

(2) The design of every building or portion of a building shall make provision for the combination of loads and forces producing the most adverse conditions of induced stress, deflection and structural instability.