This Level 3 damp survey evaluated a modern apartment in Canary Wharf (E14). The property owner arranged an independent health check after noticing wall finish failure and mould growth in the living area. The objective was to secure an authoritative, objective report on the building’s moisture status.
About the Issue
Discolouration, flaking wallpaper and heavy black mould patches appeared along one wall in the living room. The homeowner grew anxious that water was migrating through shared structural walls or leaking from internal drainage pipes.
The Challenge
Executing a complete Level 3 damp survey required testing internal wall surfaces, assessing microclimate conditions, inspecting sanitary seals in adjacent rooms and checking structural timbers.
The investigation produced key physical measurements and visual findings:
- Ambient relative humidity registered at 54.5% at the time of inspection.
- Moisture meters recorded high readings isolated to the lower section of the living room wall, where plasterboard was actively wicking water upward from floor level.
- Visual inspection of the bath on the reverse side of the living room wall identified defective, failing silicone sealant around the bath edges.
- Showering was permitting water to pass behind the bath, discharge onto the floor slab and soak directly into the base of the adjoining plasterboard.
- Ceiling and wall marks in the bathroom from a previous overhead leak tested entirely dry, confirming no active ingress from the flat above.
- Structural joinery, floor elements and plumbing runs were inspected and confirmed free from dry rot, woodworm, structural defects and pipe leaks.
Secondary checks noted that shower silicone sealant in the second bedroom was starting to deteriorate, requiring proactive replacement to avoid future leaks.
The Solution
The survey report detailed a practical, step-by-step action plan to reinstate the property:
- Strip away the damp and mouldy plasterboard from the affected living room wall.
- Provide sufficient time for the underlying wall structure and floor to dry out completely.
- Re-board, plaster and redecorate the living room wall.
- Strip out and replace all failed silicone sealant surrounding the bath to establish a watertight seal before using the shower again.
- Replace the deteriorating shower silicone sealant in the other bedroom area as a preventative measure.
- Keep the dry historic bathroom ceiling stains under observation, repainting once satisfied no further moisture appears.
- Ensure effective home ventilation habits to maintain low internal humidity levels.
The Outcome
The homeowner received total reassurance that the apartment’s structure and pipework were in good working order. Armed with an independent diagnosis, they avoided costly damp-proofing quotes and resolved the issue by renewing the bath sealant and replacing damaged plasterboard.
Why This Case Matters
Water escaping past degraded bath sealant frequently travels along floor slabs before being absorbed by lightweight plasterboard partitions. Specialist independent surveys trace these hidden water pathways, ensuring property owners target the exact leak origin rather than treating surface symptoms.
Did the survey find any active plumbing or drainage leaks?
No active plumbing or drainage pipe leaks were found. The moisture source was bath water leaking past defective surface silicone sealant during shower use.
Is the bathroom ceiling stain an active issue?
No. The ceiling and wall staining in the bathroom represents a historic, short-term leak from the flat above that was completely dry at the time of the survey.
Why does the damaged living room plasterboard need complete removal?
Plasterboard that has drawn up moisture and developed black mould loses structural integrity and harbours fungal spores, making full replacement necessary for long-term health and decoration.
Gain complete confidence in your building’s health with an independent diagnostic survey.
