Technitherm® is the best solution for random stone cavities. It is injected as a liquid and rises to fill 100% of the cavity.
Technitherm® is the only product to pass both the BRE (British Research Establishment) Flood Resilience Test and to meet their requirements for use in walls with defective or missing damp proof courses.
As well as providing an excellent thermal barrier to your building. Closed cell foam within your cavity will provide extra structural stability to properties where there are missing or failed wall-ties through its ability to adhere inner and outer leaves of properties together.