One of the best ways to protect your mansard roof from the problems of ventilation is to use a vapor barrier on the inside.
Insulating a gambrel roof room.
Interview with the contractor at the end.
There is no access into the small sidewall areas and thus must be accessed by drilling holes in the sidewalls in this case the roof and using dense pack of poured foam methods to properly insulate.
If you do not want any extra living space in your attic then you can install a low height roof but you will also have a small space to install the insulation and the ventilation system.
To insulate the roof you will need to use a combination of insulation to fully protect the roof.
Because the gambrel roof doesn t go very high above the brickwork you can discover that you do not have enough living space in your attic.
This is why careful planning is very important.
Step 1 add a vapor barrier.