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Six topics cover the whole reference. Each one opens with a short explanation of what falls inside it, then lists every note filed under it.

How heat and air actually leave an older house, and what changes inside a wall or roof once you slow them down.

Openings leak far more per square metre than the walls around them, and most of that is repairable without replacement.

Two separate jobs that share the same rooms: getting heat where you want it, and moving moist air out before it condenses.

Knowing what you can isolate, and what changes when you reduce flow at the fixture rather than at the main.

The rule that governs almost every masonry repair: the material you can replace must be the one that fails first.

Repairing and matching original timber detail, and the order of operations that keeps a repair from becoming a replacement.