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Traditionally built/solid-wall buildings are different to more modern buildings

Traditional houses were usually built with an internal fire and thus required a frequent air exchange using brick vents and chimneys to create air flow and ventilation. The semi-permeable thermal mass of the building, typically brick/stone/slate, would exchange heat and moisture with the air helping to distribute and regulate temperature and humidity (see image below). Changes in this system that do not correctly understand this may cause unbalance and lead to damp and mould problems, overheating, and ill health. 

Typical differences in moisture movement in modern and traditional houses

Source: (Historic England, 2017)

 

 

Traditional buildings