01
State what must be learned
Write down the unresolved question before choosing an opening: deck condition, fastening, a concealed flashing junction or the extent of an earlier patch. Distinguish observations needed for pricing from those needed for design. An opening with no defined purpose can cause disruption while producing photographs that still do not answer the owner's decision.
02
Choose representative and contrasting locations
Ask the consultant why each location was selected and which roof conditions it represents. A single dry area cannot establish the condition behind every valley or wall. Include contrasting locations when justified by visible evidence, repair history or interior symptoms. Record the limits of the investigation so the eventual report does not imply complete knowledge of concealed construction.
03
Record the layers and restore promptly
Agree on safe access, weather conditions, replacement slate and temporary protection before opening work. Photograph the sequence with location labels and measurements where useful. Name who will make the permanent reinstatement and when. Do not leave responsibility for closing an investigative opening between a consultant, general contractor and roofer with no clear owner.
04
Turn findings into a decision
The report should say what was observed, what remains uncertain and whether the proposed scope changes. Link each recommendation to the relevant opening. If additional investigation is proposed, explain the specific uncertainty it would resolve. Keep original images alongside the summary so later designers can assess the evidence without repeating avoidable removal.