Lay 18mm ply over old tile floor?

[homesolutions]

Good evening everyone, i need to tile a hallway that has been tiled originally and then the tiles have been painted over with floor paint.
The tiles are pretty bumpy as well so i was going to try and lay at least an 18mm ply down and screw down into the concrete floor to hold it down and then lay new tiles on top.
Will this secure the wood enough to make sure there is no movement under the tiles as it would be a night mare trying to lift all the mosiac tiles first and because the floor is uneven i think i would need to put some floor leveling compound down and then tile.
Any advice welcome and thank you in advance.

 

[gcol]

Can you afford to have your floor level raised by 30mm?

 

[homesolutions]

Yep 30mm is no problem as you step down, are you suggesting using a thicker ply?
Kind regards
for reply

 

[gcol]

No I wasn't thinking that - usually people are reluctant to raise the floor level by so much.
You can certainly screw down ply over the tiles and it will be fine. Ideally, if you can remove the paint, you can skim over with a self levelling compound and them tile to that. I'd suggest this way was preferencial to overboarding.
Overboarding relies on multiple fixings to hold the ply in place - it's not fun making multiple fixings in concrete.

 

[homesolutions]

may i ask why your preference is the levelling compound?
the floor paint on the tiles would be to hard to remove so the other option is trying remove them.
If i did this and then used levelling compound what depth would i need to do and what prep would i need to do before laying the tiles?
many thanks

 

[gcol]

may i ask why your preference is the levelling compound?

Overboarding relies on multiple fixings to hold the ply in place - it's not fun making multiple fixings in concrete.

the floor paint on the tiles would be to hard to remove so the other option is trying remove them.
If i did this and then used levelling compound what depth would i need to do...

Just enough to get it flat. Some self levellers are only meant to be used for thin layers - others can be used much thicker.

....and what prep would i need to do before laying the tiles?

Read the instructions of the adhesive of your choice. Most powdered adhesives will be fine to just go straight on to the self leveller.