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the roof is double layered with provition for ventilation of the space between the 2 layers
Just 2 layers I recommend, because if you add an additional layer the roof will get damage and collapsed.
Torch-on roofing, also known as torch-down roofing, is a flat roof covering solution that consists of three layers of modified bitumen (felt) melt-welded to the roof surface and each other with a blowtorch to create an impenetrable, waterproof seal.
Around 35,000 dollars
Removing deep snow in layers and removing snow on both sides of a low-pitched roof as you go.
it is called a roof
Usually not more than two.
The roof
The roof of a cave is referred to as the "ceiling" or "overhang".
The thin piece of wood used to cover a roof is called ply board or deck board. Plyboard is a sheet material manufactured from thin layers or plies of wood veneer that are glued together.
Roof
It is what you called the planning for the roof.