One bonus for blown in is burying your hvac ducts. Spray foam in my opinion is better used in walls. The foam advantage being the greatly reduced infiltration. Other options to consider...what kind of roof? Metal? Consider rigid foam under the metal to start with. You could do mineral wool batts in between the rafters. Beyond climate recommendations budget and time can be huge factors. Are you going for super tight super insulated uber efficiency or decent budget minded don't shoot myself in the foot design? Theres no kill like overkill bu I'm too cheap and in too much of a hurry for super tight construction.
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