As an update, as I'm getting a bunch of down votes for some reason (please comment!). Newer homes and buildings have a vapor barrier beneath the outside claddi

As an update, as I'm getting a bunch of down votes for some reason (please comment!). Newer homes and buildings have a vapor barrier beneath the outside cladding. This article on the Perfect Wall [0], explains the benefits and options. Older houses, like the Victorian that I live in, didn't have modern insulation, which can deteriorate if it gets wet, so they were made to breathe, so that any moisture that got into the wall could be removed through air movement. Not to mention that fireplaces required a constant stream of new air to replace that which is pulled up through the chimney. [0][https://www.buildingscience.com/documents/insights/bsi-001-the-perfect-wall https://www.buildingscience.com/documents/insights/bsi-001-t...]