Insulating Walls and Floors of Stone Walled Buildings

A moisture-safe approach to upgrading traditional buildings

Improving the energy efficiency of older stone buildings has never been more important. With the UK and Ireland working toward significant carbon-reduction targets, upgrading insulation in existing homes - especially traditional solid-wall buildings - offers one of the greatest opportunities for reducing heat loss and improving comfort.

However, solid stone buildings behave very differently from modern constructions. Their ability to absorb and release moisture is fundamental to their performance and longevity. Any intervention must therefore support, not restrict, this natural moisture balance.

This article outlines best-practice principles for insulating traditional stone walls and floors safely and effectively, with a focus on breathable (vapour open), capillary-active systems that enhance both thermal comfort and building durability.