Deductions & credits

Please clarify. Some contractors are claiming the roof expense would  quality if it has the reflective coating, but my reading of the instructions says I would only be able to take a credit under the Nonbusiness Energy Property Credit in form 5695 line 19c which is used to calculate at most a 10 percent credit. And this is further limited by the need to not include costs for "onsite preparation, assembly, or original installation of the components", whatever that actually means.  I do not know if that means you cannot include the cost of stripping off the old roof, or the cost of actually installing the shingles on the decking.