For your first time you should probably keep it simple - just cook them until done.
That said, I've done them both ways and prefer to foil. It seems to give more uniform doneness throughout the rack. Mushiness is a possibility if you overcook in foil, but overcooking without foil has its problems too. I usually firm up the bark by putting them back on the heat for at least 30 minutes after removing from foil.
I've done them both ways. Without foil, the ribs still come out nice and juicy, and the bark stays crispier. With foil, you can't easily check on the doneness of the ribs, and they can tend to get mushy, and the bark soft.
I doubt I'll ever foil ribs again!
next time you smoke ribs, do two racks.
1 with foil
1 without
then compare.
The last ribs I did I cooked 2 hours no foil. 1.5 hours in foil the 30 minutes sauced back on the grill with no foil all done at 275 and they turned out great. My wife said they were the best yet. Guess I'll just have to keep trying back and forth to see. Oh darn![]()
I was staunchly anti foil but I foiled my last rack of baby backs and they turned out outstanding.
I am guessing that has a lot to do with how lean BB are compared to spare. Hardly any fat would make them dry out faster, so the foil would be a plus.
Of course if you leave them wrapped too long, getting them unwrapped and put back on without them falling apart isn't easy.