Keeping your home warm / heating / energy crisis / insulation etc

That means the walls and structure have to be kept above the Dew Point - the temperature at which condensation occurs. Its not something that just forms on surfaces - it forms within the walls, which is what that old fraud of rising damp is about - moisture condensing in brickwork or stone.

This is really interesting, since a common recommendation is to fit internal insulation. For example, this is being recommended to us because the cavity in our walls is pretty nominal (~50mm). The downside is that the inner leaf of blockwork then doesn't warm up so the dewpoint moves inwards. I've read people on here saying how good they felt that interior insulation is, but I'm interested in whether this effect can cause an issue and reduce the benefit of the existing cavity.