Install pre-hung door over drywall?

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I am going to replace a bi-fold door on our pantry with a conventional pre-hung door. The bi-fold doesn’t really have a jamb it is just finished drywall. But the opening is 30×81.5 so it matches the rough opening size for a 28×80 prehung door.Can I just install the pre-hung door over the existing drywall?I’m not sure I really see a downside to this provided the shims stay tight. It just seems weird to me. via /r/DIY https://ift.tt/38QtiM3

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