In a 1.5 storey century house, do I need baffles in my attic, when access to seal between the knee wall and roof is very difficult and insulation is thin?

My 110 year old frame house near Ottawa ON (zone 5) has no soffit vents open, poor sealing at the top of the old exterior house wall/ the new addition… My 110 year old frame house near Ottawa ON (zone 5) has no soffit vents open, poor sealing at the top of the old exterior house wall/ the new addition…Read MoreGreenBuildingAdvisor