It would be wise to do a lot of homework on your home exergy before filling your attic space with an arbitrary amount of insulation, just because it will fit. A 50 x 15 ceiling is just a number that is one factor of many.
Since your home is new, the people who built it should be able to tell you anything you might want to know about it. If you had a hand in the design, you should know what choices were made in material selection and energy efficiency options. For example, if the attic was intentionally not insulated, were the walls and basement also under-insulated? If so, insulating the attic might not help so much.
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