Lintel or other solution for skillion roof?

Hi
I am building an extension that has a skillion sheet roof off the side of our house. Where the rafters(probeams) are to be attached there is an existing lintel that I can attach joist hangers to and double studs at other points. This is the case for all but 2 of the probeams, each of which both end up between 2 studs(at 450mm) at different points of the wall . Do I need a lintel between the 2 studs to attach the joist hanger to, or is there another solution? If a lintel is the best solution what size lintel would be needed.
Thnaks, mark


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