I agree with above, I have seen articles that indicate you should never spray the foam directly on the roof sheathing, so if you are considering this option have a detailed discussion with the insulation company as to exactly how this is done and applied. Check on the flammability of the product being used. Finally, ask one of the home inspectors about this option, I like Frank D'angelo.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV.
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