As a practical matter, roofs are no longer eligible for any energy efficiency tax credits.
The law was changed to remove roofs. There is still a credit for "a system that is designed primarily to reduce heat loss or gain" but this is intended for insulation and air sealing, not roofs, since the primary purpose of a roof is to keep out the weather. And the item must meet the criteria of the International Energy Conservation Code (IECC). So you would have to see if your roof is listed as meeting IECC criteria, and I think the answer is going to be No.
