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Insulation under a slate roof

My wife and I are having an old slate roof removed and a new composite material (looks like slate but much lighter) installed.

Our house was built in the 1940s and has ZERO insulation in the attic.  The attic space holds a lot of potential to become finished space some day so I am torn as to if I should add my insulation to the roof rafters or in the floor joists.

To me, my common scense tells me to insulate the roof, however, I can't find any information as to wether or not our new roof requires an air gap-- also our house only has gable vents so would I also need to add sofit vents? 

Re: Insulation under a slate roof

If it were me, I would have a cool roof installed that way you would need to worry about vents and could insulate between the rafters


Re: Insulation under a slate roof

Well we're a few thousand dollars too far into the project to change roofing materials.  Any suggestions for this project under the current scope?

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