I get the point about checking older references, but honestly, even higher-priced roofers can have issues. I've seen premium shingles fail prematurely...

Fair points raised, but I'd caution against overemphasizing ventilation as a universal fix. I worked on a project where the vents were perfectly clear...

I've noticed birds nesting under guards too, especially in early spring. Metal mesh definitely helps with squirrels, but birds seem to find their way ...

The drip edge flashing issue mentioned earlier is definitely worth investigating. I've been on a few jobs where the homeowner was convinced their gutt...