Can I tile over existing tile back splash or do I have to remove current tile back splash?
Can I install tile back splash over existing tile back splash?
Faux tile? Or mortar and grout tile? Generally . . . You can't tile over existing tile. There are exceptions. What type of tile do you have on the wall now? What do you want it to be?
You need to remove old tile. ile needs a smooth solid base. The added weight can tear both off the wall.