I’m looking at purchasing a home here in Northern Virginia and noticed that it had what I would describe as small (few inches?) ridges or tents along the edge of the roof. I haven’t seen it on any other roof in the area. I was told the owner had a new roof put in within the past 6 years or so. I took a few snapshots to try and show what I’m talking about . . .
First photo shows the distance between them and the placement. The second shows as much detail as I could get.
Can anyone tell me what these are and what purpose they serve? Thanks!