Wet Roof Purlin In Attic
While inspecting the roof structure in the attic
you will be looking for wet spots like this.
This is a wet roof Purlin and it means there is a roof leak somewhere.
Try to find a roof leak and repair the roofing before it starts to damage the roof framing and other parts of the house.
If you run into a situation like this, while doing your home inspection, notify the homeowner as soon as possible, as a common courtesy. Sometimes this is the first they will have heard about it.
Always be courteous and kind when inspecting someone else's home.