We build and insulate the attic
It is necessary to immediately warn that you can’t take risks and try to build an attic without a specialist, unless, of course, you yourself are a specialist. He should at least help you install the power elements of the roof. The specialist will help to calculate the strength of the structure taking into account the factors affecting the roof. Since the attic has an unusual roof profile, the calculation of its strength is much more difficult than calculating an inclined slope. The most difficult to calculate is the knot where the roof slopes undergo a bend. It depends on their reliability, whether the roof will “develop” under the influence of wind or weight forces. Many “underwater stones” may not even suspect a specialist.
Put the base of the roof and put the roof, provide waterproofing, put it with insulation and isolate it from water vapor coming from the lower floors, you can independently.
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The insulation of the roof of the attic is absolutely necessary, because without this the room for living is unsuitable. The insulation that is placed between the rafters is very critical to humidity. When moisture enters it, any heater loses their properties to one degree or another (mineral wool, for example, completely). Therefore, they must be protected on both sides. On the inside, the insulation must be protected from water vapor. On the outside, it must be protected from water condensate formed under the roof due to different external and internal air temperatures. Roll material (membranes) is used as waterproofing, which cover the insulation. These membranes provide good ventilation under the roof, which helps to remove condensate. Protection of the insulation from water vapor serves the same goal, however, it is necessary to remove steam from the inside by natural ventilation of the room.