Breathability in old buildings

Old buildings must be allowed to breathe. Whereas modern buildings rely on keeping water out with a system of barriers, buildings that pre-date the mid-19th century are usually constructed of absorbent materials that allow any moisture that enters to evaporate back out. Because most old buildings were constructed with solid walls without DPCs and originally had no roofing felt, rain or below ground moisture could both enter. This did not,...

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