They may be using OSB with foil (aka radiant barrier) already attached to one side for the roof sheathing. It is installed with the foil facing the attic. Felt, peal and stick in the valleys, and shingles are installed on top of the roof sheathng.
Quote:
Originally Posted by Jima64
I have to think it is not part of the shingle but put on from the attic after the roof is done.
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