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@Terry53029 wrote:

@TaxGuyBill From IRS. Link. https://www.irs.gov/newsroom/energy-incentives-for-individuals-residential-property-updated-question...

Q. Is a roof eligible for the residential energy efficient property tax credit?

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That IRS statement is wrong.  It does not qualify for the "residential energy efficient property credit" (which is what the OP asked about when he said "building envelope components".

But you are correct that certain solar tiles/shingles qualify for the solar credit.