When we remodeled our bath a few years ago there was no matching baseboard tile so our contractor put in 6" maple baseboards. Unfortunately, despite wiping the floor off in the corner after every shower, the wood baseboard acted like a sponge and now the metal corner beading is rusty and the drywall is somewhat crumbly. I'm thinking that the wall in this area should have been cement backerboard. I've removed the loose portions of the drywall and the loose, rusty metal corner piece (see pictures). The remaining drywall appears to be stable and not moldy. My question is, what is the best way to repair this so that I can securely attach the granite baseboard? Should I continue to cut out the drywall up to where the metal corner piece is no longer rusty and replace with backer board? If so, I'm not sure how I'm going to do this as the wall only sticks out about 1 inch beyond the shower so there isn't a lot of space to put in a larger piece. Any help would be very much appreciated as I'm a novice at anything other than basic drywall repair!
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