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Condition
It was determined that the site has generally remained stable, with minor erosion and movement damage, consistent with the natural deterioration of exposed archaeological excavations. It was noted that the timber floorboards also appeared stable.
Following the 2021 monitoring visit, ICS conservators developed a pest management assessment report, where the pests were identified as mud wasps. This report included recommendations for trapping and deterring the pests, and also recommended ways of breaking the pest cycle.
In 2021-2023, ICS was further engaged by Strata Plus to implement the pest strategy.
Treatment
First stage
- Three different types of traps were laid around the site
- Inspections were conducted every two weeks to determine peak period for the target insects
Second stage
- A controlled spray of residual insecticide was carried out
- Trial mortar stabilisation works were undertaken
Third stage
- Wasp burrow holes were stabilised and consolidated to blend well with the original fabric
Treatment Outcomes
The trials confirmed the type and habits of the insects, and the most appropriate actions to take.
The trials also demonstrated that the application of the insecticide did not change the appearance of the archaeology, and that filling the burrow holes imparts enhanced physical strength to the damaged mortar.
Before treatment
During treatment
After treatment
