Voids had developed behind sections of York’s historic city walls, threatening stability and requiring remediation without damaging the heritage structure.
Solution
Geobear delivered precision geopolymer injection to fill voids and strengthen supporting ground, stabilising the walls with minimal intrusion and no excavation.
Historic structure protected
Stability restored without excavation
Voids filled and consolidated
Ground support improved
Low‑impact installation
Minimal disturbance to heritage fabric
Background
Historic masonry walls are vulnerable to void formation caused by washout, ageing materials and ground movement.
Loss of support behind retaining structures can lead to cracking, displacement and long‑term structural risk.
In heritage environments, intrusive repair methods must be carefully avoided.
Challenge
Voiding behind sections of York’s city walls raised concerns about ongoing instability and potential deterioration.
A solution was required that could restore ground support while preserving the historic fabric and avoiding extensive excavation works.
Solutions
Geobear implemented a targeted geopolymer injection programme behind the affected wall sections.
The expanding resin filled cavities, densified surrounding soils and re‑established uniform support.
Injection was carefully controlled to ensure precise treatment within the sensitive heritage setting.
Results
The voids were successfully filled and structural stability restored without invasive construction works.
The project protected the historic walls and provided a durable, low‑impact stabilisation solution.
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