One of the state standards of practice, in Washington state, is that an inspector must traverse the roof if it can be done safely and without property damage. The idea is that the inspector, in so doing, will have a better idea of the condition of the roof.

While in theory that is a good concept, sometimes Pacific Northwest reality and trees interfere with good intentions -- see photo below. 

Even though I got on that roof, the organic debris was so thick that I really could not see much. I did have this to report:

The roof is heavily obscured by organic debris. This makes it impossible to assess the condition of the roof. Additionally, heavy debris keeps a roof from drying and blocks runoff water making it more prone to leakage. Recommend that qualified party, such as a roofer, remove all debris from roof and, at that time, evaluate surface and make necessary repairs or replacement as is required.

This is further proof that, sometimes, we home inspectors cannot see the roof for the trees.

Thanks for stopping by,

Steven L. Smith