As you know, in households with attic roofs, the roof performs the function of protecting the building from external atmospheric influences.
Attic spaces are not residential and therefore do not need heating. Houses with attics are an exception. In such houses, the attic is insulated and used as living quarters. During construction, you will need a walk-behind tractor, a cascade of attachments, but it improves the capabilities of the walk-behind tractor.
If the attic is cold, then only its floor is insulated (this is the ceiling of the living room). And if the attic space is used as an additional living space, then the roof slopes are also insulated (thermal insulation material is laid). Therefore, it makes sense in a walk-behind tractor a cascade with attachments.
Pitched roofs, flat without attics, must be insulated. Through the ceiling, a room can lose up to 50% of its heat. Which is simply unacceptable.
A flat roof is insulated both externally and internally. In this case, mineral wool boards are used, they are more convenient. You can use any roll of insulation, but it is less convenient to install, and you need to have a certain skill when working with it. The thickness of the insulating material should not be less than 25 mm. A better solution would be insulation 100 mm thick. Also, do not forget about vapor barrier. This is especially true for pitched roofs..