Older terraces need construction-led diagnosis

Preston City Council describes Deepdale Enclosure as a good example of Victorian terracing and Avenham as containing Georgian town houses and smaller terraced houses using traditional brick and slate. In houses of this period, do not assume that a low damp patch has the same cause as one in a later cavity-wall property.

Ground levels and suspended floors

Front paths and rear yards are often resurfaced over many decades. Where finished ground has crept towards the DPC, low-level moisture can bypass the original arrangement. Suspended timber floors also make sub-floor airflow and joist bearings relevant.

Chimneys and rain exposure

Older terraces with chimney stacks can develop rain-related damp around breasts from flashings, masonry or flue conditions. Compare the internal staining with weather before describing it as rising damp.

Finding the cause before treatment

A local damp specialist should still be able to explain the moisture mechanism in this particular property. Ask how the internal pattern relates to ground level, rainwater goods, wall construction, ventilation or plumbing before agreeing to injection or replastering.

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