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Thanks. I was trying to avoid a jam extension, which I've used on other sliding doors in the house, because the rest of the doors in this room use 1.5" casing. If I used the same on this door I don't think it reaches enough of the stud to securely attach:
The other idea I had was to run the drywall over the door frame, fill the gap between the drywall and frame with a ripped piece of wood filler, and then cover the edge with paper corner bead ripped down to the depth of the drywall/filler:
Essentially I'm treating this like a narrow outside edge. I'm curious whether you think this would be strong enough. But I'll probably end up using wider casing with a jam extension.