Okay, here's what happened. We put up new walls in the bathroom. The entire wall is sheetrock, except in the addition, which is WonderBoard. Then we decided to tile the walls about halfway up. Then we realized we had to have cementboard on the walls where the tile was to go. So we, mistakenly, I think, attached cementboard only as high up as the wall tile is to go. Now there is a "lip", or, edge, sticking up above the wall tile. Do you think we should add more cementboard--taping it to the existing edge--then put sheetrock the rest of the way, up to the ceiling? The addition part is fine, as it is ALL cementboard. I just think it won't work the way it is b/c, even if we did attach a slim top/trim/bullnose piece, the whole wall would stick out an extra 1/4" from the rest of the wall. I attached a few pics, so you can see what's going on here! I would also appreciate some advice on what to do around the door frame. Should we add a thin strip of cementboard in that gap & put tile there, then the door frame would go OVER the tile. Or, should we install the wooden door frame/trim piece, then tile around it (on the wall).