> Interesting, why isn't the moisture on walls behind insulation ever an issue on new construction? Newer building codes have started to mandate more external

> Interesting, why isn't the moisture on walls behind insulation ever an issue on new construction? Newer building codes have started to mandate more external insulation: * https://www.buildingscience.com/documents/insights/bsi-001-the-perfect-wall https://www.buildingscience.com/documents/insights/bsi-001-t... Depending on the climate zone, up to half the insulation may be mandated to be on the outside (behind some kind of cladding (brick, stucco, siding) to protect it from UV and bulk water). Per the above article, by having the outside be insulation, your interior structure is kept warmer, and so condensation is less likely to occur. Do a search for "Joseph Lstiburek" and "Matt Risinger", who have lots of articles and videos on building science. * https://en.wikipedia.org/wiki/Building_science https://en.wikipedia.org/wiki/Building_science