Green board has a different core compound also, but will finish with standard joint compounds. I will always recommend Taping mud for setting .
Position the drywall tape into the corner beginning at the top and gently moving to the bottom. The crease should fit perfectly into the corner. Even slightly .
There's a good 1/2 inch gap between the new drywall and old section of wall. I pre-filled this gap with joint compound then applied the fiberglass joint tape. The drywall panels are in place. You have your fiberglass joint tape covering all the seams.
Hot, steamy showers can cause the drywall to start peeling from the. Apply a thin coat of drywall joint compound to the area using a drywall taping knife.
In our baths we only ran the durock 7' or so up the wall, the upper 2' was drywall. Ran tile to the ceiling in one, and a couple inches higher that .