17/10/2026
Part nine. Roof on, foil up.
This is one of the very few things in a house you genuinely cannot fix later. Once the plasterboard goes on, that is that for thirty years.
Insulation is the least photogenic thing we do and the one that decides what the house costs to run for the rest of its life. Nobody visiting in five years will ever see it. They will just notice the place is warm and quiet and the bills are lower than they expected.
If you are building: this is not the stage to save money on. It is the stage to spend an extra afternoon getting right.