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Insulating where soffit meets addition

I have an L-shaped ranch with an addition at the insde part of the "L". The addition was built about 6 feet away from the house so where the gutter line ended a (semi) flat roof extends toa vertical wall where the roof in the family room is higher. Basically I have a flat roof space about 12" high where the soffit and roof line meet the family room. I can add about an R-19 layer of fiberglass, but should I add foam board or sprayed-in insulation under the original roof sheeting to avoid heat transfer and ice-damming on the flat roof.
I can provide a picture or drawing if this would help.

Thanks,

Gary in Ohio

In Other Insulation Asked by gkohio

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A diagram would be helpful

Answered by Insulator -

Hi Gary,
This would seem to be a good answer to your question which I realize has been posted for awhile now and am sorry about that. I have an insulation company myself and people ask me about the same question about ice damning. They want to spray the first 3 or 4 feet to stop ice damns the way I try to explain it is now we stand a chance to move our ice damning up into the middle of the roofline instead of down bottom.
Everything I do on a house I look at it with the question in mind what can I screw up if I do this.
Thanks for the post The director/broom pusher