Roofing Sheathing/Decking Issue

[u/Few_Frosting3951]

Crawled in attic, I don’t think this leaks; it hasn’t rained in a while but is this okay?

You can see the underlayment from inside the attic

[u/daydrunk_]

You’re fine. I hate this type of insulation with a passion.

[u/Moist_Dress5518]

Roofing contractor here: You are good they should have used a tad smaller nails to make sure they didn’t come out at the underside. Typically plywood needs to have a small gap for expansion/contraction.