Buildings of historic significance are not only at risk from water damage but also from inappropriate remedial works carried out by semi- skilled contractors with little appreciation of historic architecture. Over the years we have acquired a detailed background knowledge of historic building techniques and materials used. We fully understand and recognise pre-existing damp issues. Drying objectives are agreed in consultation with conservation officers and architectural historians.

Opening up to investigate potential damp issues should not be confused with ‘stripping out’. Initial surveys are limited to non-destructive and keyhole techniques using specialist equipment including endoscopes, borescopes and moisture meters with deep wall probes.

If circumstances allow, natural ventilation is the preferred method of drying, however this approach should be balanced against the increased likelihood of mould growth and potential timber decay. Controlled mechanical ventilation, using fans can speed up this process by focussing air movement in strategic areas. Modest background heat (preferably around 18–20°C) can be introduced in the final stage of drying however it must be accompanied by adequate ventilation to avoid increasing humidity.