I am renovating my house and am starting on the bathroom. After removing the old tiles, alot of old render/plaster has come away, revealing some bare brickwork. Most of the old surface (about 3/4" thick) is good but there are some bits around the wetter areas where is has just fallen off. Obviously I need a good flat surface to tile onto but I'm not sure how to do this. I normally just use a bit of bonding for little bits but I think these areas are a bit big. I was thinking of rendering it but not sure if this is the best way and not sure of the mix. Any recommendations would be appreciated. Cheeers, Richard.