Agreed, not required, however, we added some to control where the runoff went. In our case, we had lots of runoff on the driveway which resulted in some staining. If you add a birdcage, you will get a 'super gutter' along the roof common to the birdcage, once again to control where the runoff goes.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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