Triso Super Number 10

Rolls of shiny insulation are stapled onto the beams. At £250/roll, this stuff had better work well.
Encasing the insides of the roof, this stuff makes the little room feel more like the space shuttle.

Next, batons are nailed in over the Super Triso Number 10 (which feels like the results of cross-breeding a roll of tin-foil and a duvet).

These batons will have plasterboard screwed to them next - already it's making the room feel a lot smaller.