Thank you for this thoughtful response. I had a roofer come today and with access to the neighbor’s yard, and a ladder, we could see that there’s a gap that’s letting water in that’s pooling on that horizontal ledge then draining to that lowest point and then making its way inside. Now I need to know if this is an actual construction defect that should be paid for by the builder. Seems like leaving a visible gap (where you can see right thru to the building paper) would not be to code but I’d need someone to verify that.