[Tweed11]

My dad has a old shower with pebble floor tile and he was wondering if he could grout over the old cement grout with a new product. I told him I think he needs to dig the old out. Any thoughts or experiences.

 

[EthanB]

Remove and replace. Grout needs to be keyed into the surface, not skimmed over it.

 

[cleveman]

Is cementiodious latin?

I would sell the house or demo the floor.

 

[TNTRenovate]

What Ethan said. Grout serves a purpose. It locks the tiles in place, but also needs to take hold and that cannot be achieved just skimmed across the surface.

 

[CarpenterSFO]

Pebble floor? Removing the grout is the same as demoing the floor.

 

[Tweed11]

Yeah kind of what I was thinking. And there is kerdi underneath the floor to scared he will damage it.