Got a new roof 3 weeks ago. Cleaned up the garage floor after the new roof was installed. But then every few days I used to see some granules or wood shavings on the garage floor. First few times I thought they might have swept in from corners where I did not clean. But then eventually found that the shiplap around one of the new furnace vents the installed seems to be deteriorating (Pic -
Imgur: The magic of the Internet ). How concerning is this? Roof has a GAF golden pledge warranty.