JDC1, appreciate the response. The more reading i do on this topic the more common i find it is. Seems air getting in a seal can also cause this. As well as a poor install job at the time of the roof install. do you think its worth cutting into or wait to see if they grow or is just the way the roof is? Also, about 5 feet back from the front, in 4-6" from the sides on both sides, the material that they bring around the sides under the roof seems to have let go slightly. I can push it down 1/4 to 1/2" where you can tell it meets a firm surface it seems to be intended to be adhered to. Any thoughts on that?