New answers tagged patching-drywall
To repair drywall tape that has come loose you will need to remove the tape sections with a utility knife. Next replace the tape you removed by liberally troweling joint compound into and around the incision. Rip a piece of drywall tape from a roll and push it onto the wet compound. At about a 20 degree angle and with gentle pressure , pull your drywall ...
I used drywall paper tape with a couple layers of setting drywall compound (aka 'hot mud', but my application was in a closet, and didn't have the complexity of a wet installation or tiles pulling on my patch. Even so, it seems about as solid as the rest of the wall, and seems to work well.
If it was me, I'd cut away the bad drywall and replace it with 1/2" hardi board. That'll give a flat, solid and waterproof substrate for your tiles, in contrast to the beaten up drywall you've got now. Oh, and be sure to thoroughly caulk the gap between the drywall and the hardi.
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