If the roof is unheated (under) then ordinary felt will work.
If this way my house would use ice and water shield entire roof.
And get the most durable long lasting roof shingles. Keep the receipt.
I have had 2 batches of roof shingle prematurely fail in 2 different decades. Not the same brand either. The warranty is only for the shingles. But it is something.
Next time out driving view roofs. You will see color fade and darkening on some. Just plain poor quality shingles.
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