The roof of our portico (front porch with columns and a roof) seems to have these horizontal “ridges” (not sure if that is the correct term). I’m not sure if these ridges are normal or a deficiency in the roof. Water seems to pond for a few hours within the areas defined by these ridges. The water does drain when there is enough of it but once the water level gets sufficiently low it stops draining and just gets absorbed into the roof material over the course of a few hours.
I took the below photo outside of the window of the adjacent bedroom. Note that the water in the photo is from a test using a bucket.
Typically when it rains the water doesn’t pond this much because the roof of our home blocks most of it from landing on the roof of the portico.
Should I be concerned or is this level of “ponding” normal? Note that after some hours the water seems to absorb into the roof material.
What are these “ridges”? Are they a feature of the roof - meant to channel the water or something? Or is it a deficiency in the roof?
Basically I want to know if this is something that the builder should fix (it’s new construction) or that I should fix if they’re not going to do it.
Thanks in advance.