A damp basement in summer: what to establish before insulating

State whether the space is for storage, a workshop, laundry or a proposed change of use. These are not interchangeable functions. The designer needs the actual intention before proposing a solution.

Separate existing contents from planned equipment. Identify access points to services and installations. New linings should not inadvertently block access required for inspection.

Note whether the issue occurs in summer, during the heating season or after particular events. Do not extrapolate one observation to the whole year. Include how the room was being used.

Do not assume that leaving a window open longer on a hot day always helps. Ventilating a cool basement must account for indoor and outdoor conditions, not simply the time on the clock.

Distinguish surface marks from observed water entry in your report. Describe location and circumstances without assigning a cause yourself. These are different pieces of evidence for the investigator.

Where records show a previous repair, provide its scope and date. A coating or lining being installed is not itself evidence that the moisture source was removed.

Look for drawings and descriptions of existing protection and the wall-to-floor junction. Explicitly flag missing documents. Do not reconstruct hidden layers solely from paint or lining appearance.

Photograph accessible areas, but agree any opening-up work with a specialist. Your description should show the limits of what is known, rather than imply the whole building element was checked.

When discussing PIR, separate thermal requirements from water protection and ventilation. Ask what each part of the proposed solution does. One trade name does not describe the complete system.

Do not select board thickness solely from available wall space. Establish who assesses the full build-up and details at openings and services. Keep the agreed version of the solution.

Sequence the investigation, any repair of the cause, substrate preparation and subsequent work. Add start conditions where results are prerequisites. A cost estimate does not confirm building readiness.

Retain checking results and the follow-up observation plan after the agreed work. If symptoms return, compare actual conditions, not just handover photographs. Continued use should account for unresolved issues.