My bathrooms have standard-issue, double sink vanities. The vanity surfaces are in good condition, but boring. The surface is standard-issue vanity surface, not tile or granite. Original 1980s (whatever they used back then). I'd like to tile OVER existing surface to save money but add value. Do I need to rough up the surface for tile to properly adhere? How? Is this project even a good idea? HELP!
I'm not a pro, just a long-time DIYer. I've seen tiling over formica done both ways (by pros). Most screw down a thin layer of cement board over the formica, but since it doesn't shrink and expand like plywood, I've also seen one or two just apply the thin set and tile directly to it.
Let a pro in here tell you which is best. Personally. I would go with the cement board, which is what the pro who did to our kitchen counter tops when we had tile installed over the old formica.