WHL SURVEYING & ENGINEERING CASE STUDY
Structural Survey & Defect Diagnosis of Period Semi-Detached Property
WHL Surveying & Engineering was instructed to carry out a structural survey of a semi-detached property dating from the early 20th century, including later extensions and a conservatory addition.
Scope of Work
The inspection assessed the condition of the roof coverings, load-bearing masonry, lintels, suspended timber floors, and internal finishes, together with consideration of risks associated with shrinkable clay soils and moisture ingress. A visual inspection of accessible internal and external areas was undertaken, supported by drone imagery for roof areas.
Findings
The property is of solid wall construction to the original structure, with cavity wall construction to later extensions. The building was found to be in generally reasonable structural condition, with defects consistent with age, historic alterations, and maintenance issues. Slight stepped cracking to the left elevation and minor internal cracking were observed, likely attributable to historic settlement and thermal movement. Roof coverings exhibited slipped tiles, weathered mortar to ridge tiles, and aged flat roof coverings, increasing the risk of water ingress. Painted brickwork was noted to be trapping moisture, contributing to spalling and internal dampness, while a kitchen window lintel showed signs of concrete spalling and corrosion of embedded steel. Evidence of past moisture ingress was also observed within the roof void, and localised damp staining internally was linked to defective external elements.
Recommendations
It was recommended that external repairs be prioritised to restore watertightness, including roof repairs, renewal of defective flashings, and replacement of aged flat roof coverings. Painted masonry should be carefully treated to allow the building to breathe, with localised brick repairs and repointing using compatible materials. The defective kitchen lintel should be replaced, and cracking monitored with allowance for reinforcement if movement recurs. Improvements to drainage and surface water management were advised to mitigate risks associated with shrinkable clay soils. Internally, refurbishment works should include investigation of concealed structural elements, renewal of aged plaster finishes, and verification of compliance documentation for extensions and replacement windows.
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