Cut a piece to size with a miter saw.
Should wall tiles be placed directly above baseboard.
Expansion joints in the floor.
If the tile floor is in a bathroom or toilet room then yes you really should.
Apply an even line of construction adhesive to the.
If you remove the baseboards another option is to replace them with matching bullnose tile instead of wood.
As such while tiling directly over wood of any kind is generally frowned upon in the tile industry you can tile over a wood paneled wall as long as the proper adhesives are used because the movement is negligible.
There are two reasons for this gap which is generally required by building codes.
Normally this area is underneath the baseboard trim.
You must be able to caulk the space between the wall and the ceramic tile floor.
If you tile up to the baseboards leave a 1 4 gap next to the baseboard and fill the space with caulk that matches the grout.
With walls this is also true but it is less important than with a floor installation where foot traffic is a constant concern.
An overflowing toilet can dump a lot of water on the floor and a bead of clear silicone caulk can keep that water from leaking into the wall and running down to a finished ceiling below where it can do a lot of damage.
Always install the ceramic tile floor before installing the wall baseboard trim.