Sorry to come across as negative. Recall that I did say "in an attic". In an attic you have room to spare. That's the sole reason why r60 is recommended in attics as opposed to r40 for walls. Bringing an attic to r60 with spray foam costs a LOT more than it does with cellulose. If you really want you can squirt a "flash" of foam on the entire ceiling and then blow cellulose. Or you can just air seal and use cellulose.
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You know you're an ecorenovator if anything worth insulating is worth superinsulating.
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S-F: "What happens when you slam the door on a really tight house? Do the basement windows blow out?"
Green Building Guru: "You can't slam the door on a really tight house. You have to work to pull it shut."
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