In March 2019 we had a new CertainTeed Landmark Pro roof installed. They replaced the OSB decking with new plywood and installed a CertainTeed synthetic underlayment.
We live in the Seattle area and have noticed - 2 months later- several areas where a shingle bulge has developed and is going up coursing towards the second story. It is not exactly a straight line as you can see from the photos. The bulging in the shingles seems connected - that is, it isn’t an isolated shingle here and there showing a bulge.
Is this due to a recent couple of weeks of very high heat we experienced here, or, is this due to poor install issues? We had a Tamko roof for 20 years installed with roofing felt as the underlayment and had not seen this bulging in the old roof.