Roofing Felt ?
Sometimes crews run it vertical. Orientation to prevent leaks doesn't work well when run vertically although if you are in a warmer climate and the shingles are done well you shouldn't have any problem. Underlayment of any kind is just cheap insurance should you have leaks down the road. Why didn't you talk to them when you saw it and have them switch it?
Josh Jaros Remodeling in The Woodlands, Texas
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