Hope this post finds you well and in good spirits today.
After going through several of your posts and members replies, without offence to you and the members, I wish to state. I am surprised by all the posts and your replies.
Your fiduciary obligations, to which are broad: Your duty of loyalty, separate yourself from recommendations. In other words avoid conflicts of interest.
Your duty of care. Report what you know. Referring to professionals.
Building sciences. Simple as that.
Roof covering. Composition shingles.
Symptom. Localized Wet, Damp shingles.
Inadequate roof deck venting.
Poor attic circulation.
Blocked eave vents. Blown in cellulose insulation over eaves.
No insulation eave dams.
Suspect: Microbial growth on sheathing. Microbial growth on rafters.
Recommend: A licensed IAC2 contractor, an indoor air quality contractor, to perform a microbial survey in the attic.
Recommend: A licensed roofing contractor install adequate roof deck vents.
Recommend: A licensed insulation contractor improve eave venting.
Act upon any recommendations therein for all above.