With the first-fix of electrics and plumbing done, the insulation is put into the studding.
The external walls all have insulation board variously made by Kingspan, Celotex or Quinn. the board is rigid enough to cut to size and the foil covering increases vapour resistance. You can see the electrics first-fix in this photo.
The internal walls of the bathroom don't need the vapour layer. They are insulated with rock wool which is mainly to have sound insulation. The rock wool is soft and squishy so has to be added after one side of the studding has been covered with plasterboard.
Plastering always leaves a lot of mess and dust. It took several rounds of sweeping, hoovering and mopping to get rid of it but worth doing before continuing otherwise a fine layer of dust keeps landing everywhere in the property.

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