Either way you go, just make sure that the underlay boards don't move. You
can get things called Annular Ring Shanked Nails, and many others, that when
hammered in, can't pulled out again to easily, so are great for fixing down
boards ready for tiling. You'll need to fix the underlay boards at very
small intervals with the nails, so buy lots. I know we used over twenty
nails on one sheet of 8' X 4' X 1/4'' plywood before our tiler gave the OK.
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