Example independent damp and timber survey - London

Independent Damp and Timber Survey

Company History

Harbour Building Pathology is a fictional independent practice specialising in evidence-led damp, timber and traditional-building investigations. Recommendations are directed first at observed moisture sources, ventilation defects and affected materials.

Legal Disclaimer

This report records a non-destructive inspection of the accessible areas described. It is not a structural design, drainage test, invasive timber survey, valuation or guarantee that concealed defects are absent. Conclusions apply to the evidence available on the inspection date and should be reviewed if opening-up or repair outcomes provide different evidence.

Client Instructions

Investigate reported staining and mould at the front cellar and ground-floor external wall; inspect associated accessible timber and ventilation; record environmental conditions; identify the best-supported moisture mechanism; and provide proportionate next actions and budget allowances.

Executive Summary

The primary working conclusion is localised rainwater penetration. Internal staining, failed paint and the highest comparative moisture readings align with external staining below a cracked hopper and a downpipe joint that leaked during rainfall. Minor mould at the cooler cellar-wall junction is considered secondary to the persistently damp surface.

Elevated pin readings and localised softening were recorded at accessible joist ends beside the affected wall. The concealed extent cannot be established without targeted opening-up. The kitchen extract fan operated; the bathroom fan did not operate when tested.

No distinct low-level moisture profile, generalised raised ground level or accessible plumbing leak was identified. Repair the rainwater defect, restore bathroom extraction, inspect the joist bearings and allow drying before deciding whether plaster replacement or any damp-proofing treatment is justified.

Scope and Definitions

Accessible internal and external areas were inspected visually and with non-destructive moisture, temperature and relative-humidity measurements. Furniture, fixed finishes and stored contents were not removed. The cellar ceiling limited direct inspection of some joist bearings.

Energy Performance Certificate (EPC)

The EPC is recorded as contextual evidence. It does not diagnose dampness, and any insulation recommendation must be considered with the traditional solid-wall fabric and ventilation strategy.

Description of Property

Two-storey mid-terraced dwelling with cellar, solid brick external walls, suspended timber ground floor, pitched slate roof and a later rear addition. The front elevation faces north-west. Occupancy was normal for the property size at the inspection.

External Observations

• Local staining and algae below a cracked front rainwater hopper.
• The adjacent downpipe joint leaked during rainfall and discharged partly over paving beside the cellar wall.
• Pointing was locally weathered but generally intact away from the rainwater defect.
• No generalised high external ground level was recorded at the inspected front elevation.

Adequacy of Ventilation

The kitchen intermittent extract fan operated. The bathroom intermittent fan did not operate when tested. Background ventilators were present and unobstructed in the inspected rooms.

Inspection Restrictions

Stored contents restricted parts of the cellar perimeter. Floor finishes and the cellar ceiling prevented full inspection of concealed joist bearings. No destructive opening-up, drainage test or laboratory salt analysis was included.

Structural Timber

Accessible front ground-floor joist ends beside the affected wall returned elevated pin readings, with local surface softening to one bearing. No fungal species identification was attempted. Targeted opening-up and assessment by a competent timber or structural specialist is required before repair or treatment is specified.

Damp and Mould

The moisture pattern was focal rather than a continuous low-level band. Surface mould was confined to the cooler cellar-wall junction. No active plumbing leak was visible in the inspected area. The observed rainwater defect and matching internal distribution provide the strongest current explanation.

Atmospheric Conditions

Spot readings describe conditions at the inspection only. They may change with weather, heating, occupancy and ventilation. The internal vapour pressure was modestly above the external reference, but room-wide humidity was not sufficient by itself to explain the focal masonry wetting.

Damp Survey Methodology

• Visual inspection of accessible internal and external fabric.
• Comparative electrical moisture profiling, interpreted against substrate and distribution.
• Pin readings to accessible timber where appropriate.
• Air temperature, relative humidity, dew point and surface-temperature comparison.
• Correlation of internal findings with weather, drainage and external defects.

Floor Plan

Environmental Conditions

Condensation Risk Analysis (BS EN ISO 13788)

A steady-state screening calculation was completed for the front solid-brick wall using the recorded construction and selected climate assumptions.

HHSRS Hazard Assessment (Assessor-entered)

A damp-and-mould entry was requested as a separate assessor-owned record. The likelihood and harm outcomes below are fictional inputs for this example.

Weather and Property Orientation - North-West

Light rain occurred during part of the inspection, allowing active leakage at the hopper/downpipe joint to be observed. Weather data and site observations refer to the same inspection period.

Subsoil and Drainage Details

External Analysis

Internal Room Findings

Indoor Air Quality Assessment Overview

The assessment combines the recorded internal air temperature, relative humidity, external reference and surface temperature. Scores describe the inspection snapshot and a sensitivity model; they do not diagnose the source of localised building moisture.

Environmental Sensitivity Matrix

Independent Surveyor Disclosure

Harbour Building Pathology has no financial interest in the contractor appointed to complete the work. Figures are budget allowances, not quotations. Competitive quotations against an appropriate specification should be obtained before instruction.

Essential Summary of Costs

Important Notes

• Repair the identified moisture source before replacing finishes.
• Open timber under a safe system of work and assess structural significance before specifying repair or treatment.
• Allow masonry to dry and repeat the moisture profile; remove plaster only where it has lost integrity or further evidence justifies removal.
• Do not specify a chemical damp-proof course, cavity membrane or wholesale replastering without evidence that it addresses a confirmed cause.
• Review any applicable landlord or housing duties separately for the actual tenure and instruction.

Declaration

I confirm that this report records the observations, measurements, limitations and working conclusions stated. The primary conclusion is based on the accessible evidence at the inspection date. Further opening-up, repair outcomes or monitoring may require the conclusion and recommendations to be revised.

I have reviewed the report for internal consistency, distinguished observed evidence from inference, and identified where specialist assessment or further investigation is required. Any HHSRS inputs shown are assessor-owned judgements and do not represent a local-authority determination.