Tile over old tile

[Downaski]

Hi everyone,

Is it okay to install new tile over old tile if the existing layer is still solid and well-adhered, or is it always better to remove the old tiles first?

Thanks in advance!

[TinyTool]

Hi!

Yes, it's generally okay to install new tile over old tile as long as the existing layer is solid, flat, and well-adhered with no cracks or loose spots. The old tile basically becomes your new subfloor. Just make sure to clean it thoroughly and scuff the surface with sandpaper or a grinder to help the new tile adhesive bond properly.

That said, there are a few things to keep in mind. Adding a second layer increases the floor height, which could affect transitions to other rooms, door clearances, or fixtures. Also, if there are any signs of moisture issues or instability in the original tile, it's better to remove it and start fresh.

So it’s not always necessary to remove the old tile, but it really depends on the condition of what’s already there and whether the added height will cause problems.

[Downaski]

Thanks! What is the best way to scuff the old tiles? Would regular sandpaper work, or do I need a specific tool for that?

[TinyTool]

A good way to scuff the old tiles is by using coarse sandpaper or a grinding tool to roughen the surface. For smaller areas, hand sanding can be enough, while larger spaces are usually easier to handle with a power tool. The main idea is to create some texture so the new tile adhesive can bond well. It's also important to clean the surface afterward to remove any dust or debris.

[Downaski]

Thanks! Would using a regular orbital sander work for this, or is there something more effective?