That was all I (and Dodgeman and Fred in TX) were saying. 'Go for the RB but use them in conjunction with adequate venting.' I don't know why they weren't saying that venting WAS an 'issue'. I stand 'corrected' on the part where sheathing and shingles don't 'measureably deteriorate' from Radiant heat. That's OK as long as the heat is vented.
As for missing Physics class, welcome to the club!