I'm looking for some pointers on tiling the wall to make a surround behind my woodstove. I've got a Napoleon 1900. I tiled the area under the stove with with cement board, steel fire barrier, and 12x12 ceramic tile last year. The stove has clearance on the back and sides to conform with combustable materials code. I'd like to move it back closer to the walls and continue the tile work up about 4'. The walls that would be tiled are plaster over brick. Can tile be put directly on the painted wall? Do I still need to install a fire barrier since there are no combustable materials in the wall? Is there some type of mesh that needs to be attached to the wall before tiling to make a more secure bond between the tile/mastic/paint over plaster wall? I asked at the local hardware store, but they weren't much help. Can anyone share their expertise?