Timber Decay & Moisture Investigation

Consurv was appointed as an independent consultant to investigate reported wet and dry rot within a substantial 19th century protected building. Previous investigations had attributed the decay largely to a defective rainwater connection, with extensive removal and treatment of affected building fabric proposed.

Consurv was asked to independently assess the cause and extent of the deterioration and determine an appropriate approach to remediation.

Through detailed inspection, moisture testing, selective opening-up and laboratory analysis of fungal samples, Consurv established that the deterioration was associated with a wider moisture problem rather than a single isolated leak. Defective gutters and downpipes, failed external weathering details, poor drainage and high ground levels were among the contributing factors identified.

The investigation also found that watertight internal linings were restricting ventilation and creating a damp microclimate in which fungal growth could thrive. Consurv recommended opening these areas to improve airflow and allow the building fabric to dry naturally.

Consurv challenged the extent of removal being proposed, particularly where historic fabric was considered suitable for retention. This included recommending the retention and repair of the original parquet flooring rather than unnecessary replacement.

Consurv’s approach focused on addressing the cause of the decay rather than simply treating its symptoms.

Our recommendations prioritised stopping sources of water ingress, improving external weathering and drainage, increasing ventilation and allowing the building to dry. Chemical treatment was not considered a substitute for resolving the underlying moisture problem.

This approach addressed the underlying cause of the timber decay, helping to prevent further problems while retaining as much of the original building fabric as possible.