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Insulating a stone fondation.

I am renovating a 100+ year old farmhouse in Quebec, Canada, and we are completely redoing the insulation. We are going with spray foam for our new addition and the stone foundation of the old house. My question is: is it better to spray from the inside or the outside on the stone foundation? I have heard pros and cons for both and am at a lose as to what to do. Any advice would be greatly appreciated.

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