The Palace of Westminster Courtyards Project: Sourcing Stone for Repair and Conservation

Research on the Palace of Westminster, part of the UNESCO World Heritage Site, reveals that magnesian limestone—despite its reputation for poor durability—can be highly durable when properly selected and used correctly. The study identified suitable sources for replacement stone, offering both immediate and long-term solutions for repair and conservation. To achieve this, petrographic analysis was conducted on samples from the building to match existing stonework characteristics. Durability was assessed using established tests and novel methodologies, including large-scale wall exposures to accelerated frost weathering under realistic conditions. Logistical challenges, such as sourcing and transport issues, along with mason unfamiliarity, were also found to contribute to the original stone's decay.

Laycock, E., Jefferson, D., & Hetherington, S. (2020). The Palace of Westminster Courtyards Project: Sourcing Stone for Repair and Conservation. XV International Conference on Durability of Building Materials and Components. eBook of Proceedings. https://doi.org/10.23967/dbmc.2020.152