Record where moisture appears and whether it also occurs on dry days. Describe heating, room use and recent changes without deciding the cause yourself. Mention new insulation, windows or roof work and keep the related documents. Ask which parts can be inspected and whether more investigation is needed. A suitable response should follow the assessment rather than simply covering a damp mark.
Do not diagnose from one mark
A damp patch can have different causes. Describe its position, extent and when it appears rather than naming a cause immediately. Rain timing, indoor conditions and the roof build-up may all matter to the assessment.
Record indoor conditions
Mention how the room is heated, ventilated and used. Note activities such as drying washing and any changes in use. These observations help the specialist understand conditions without assuming the occupants caused the problem.
Include recent building changes
Report recent insulation, window replacement or roof repairs. Share available layer descriptions and photographs. A change in one component can affect the assessment of the whole situation, even when the damp appears somewhere else.
Let the findings determine the response
Ask the assessor to separate observations, possible explanations and recommended investigation. A repair should follow those findings. Ventilation advice, further moisture investigation and repairing an external connection are different interventions.
Keep a room-use log
Alongside photographs, note occupancy, heating, ventilation and weather at the relevant time. Use a consistent place and date for each observation. The aim is useful context, not an attempt to prove a diagnosis yourself.
Ask for an explanation before approving repairs
Request the reason the proposed work addresses the findings, and ask what remains uncertain. Keep the assessment with the quotation. If another specialist is needed, clarify that responsibility before combining several unrelated repairs.