hi, ive got a bathroom to tile, and was after some advice. The walls are straightforward, but the floors are wooden floorboards. I was wondering what preperation i need, i.e plywood thicknes and how to apply it. Also, do i put anything onto the ply before tiling, like sealants? or do i just tile straight onto the tile? also the tiles are porcelain, and someone told me i should seal them before grouting?? anybody know if this is true? any advice would be welcome, oh and hello to everyone, im a total newbie to the site...many thanks, jimmyk07