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Supporting Water Tanks
If water tanks are to be supported on the trussed rafters in accordance with the details shown then the provision for these must be taken into account at the design stage.
Otherwise, the additional loads imposed by the water tanks must be supported independent of the trussed rafters.

Where space is limited this detail may be used between members a & b and b& c in order to gain head room. However a minimum clearance of 25mm above the ceiling lining or truss member must be allowed for possible long term deflection.
Note: Support members may be of any species with a permissible bending stress not less than that of European redwood/whitewood of C16 strength class or better.