We do not only insulate the exposed areas of the building, we also use insulation within the internal floors and partitions. Here we have specified 200mm thick mineral wool between the floor joists and also 100mm mineral wool between the members of any stud partions. Insulating what would otherwise be structural voids in this way, not only reduces the risk of fire spread, but also offers better sound insulation between rooms and floors.
Good insulation between rooms and floors also increases the potential to save energy by providing greater control over the dispersal of heat throughout the building. This means that energy is not wasted trying to keep the temperature in one room higher while heat otherwise escapes through the walls and floors into another.