Do you mean true domed or just curved in one direction, - done the later just a case of choosing the correct mounting systems and aloowing for the curve effect on the wind loading / uplift / overturning which will be much greater than on a single plane or flat roof.
True dome it will require a bespoke mounting system designed by a structural engineer to support / fix.
Worcester, thanks for the reply,
it is a true domed roof (bus garage) I was thinking along those lines but take on board the structural ,wind lift issues.
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