Different investigative methods provide different kinds of evidence. A survey may identify areas needing further evaluation, while selective openings can reveal actual layers and conditions. The method's limitations should be explained in the report.
What to do next
Ask what the assessment can and cannot establish, how suspected areas will be verified, and how openings will be restored. Use the results to define the scope rather than treating a colored survey map as a complete diagnosis by itself.
Related Perkins guidance
Contact Perkins Roofing to discuss your roof and the appropriate next step.