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Camber in Glulam

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Title: Camber in Glulam

Is it required to camber the glulam to 1.5 x the dead load deflection.  The roof slope is 1/2": 1 ft.  If I satisfied the minimum required slope of 1/4":1ft, can I eliminate the camber?  Even if it deflect by 1.5 x DL deflection the slope will still be greater than the minimum slope. 

Is there any other criteria aside from ponding that will require cambering of glulam beam?

Thanks a lot in advance,

Alfonso S. Quilala Jr., P.E.