Flooring help required

[parchy99]

Hi Guys (and gals),

Im tiling an upstairs bathroom floor at the weekend and wanted to double check im not going to mess it up!

The customers tiled floor is cracked and you can feel quite a bit of movement in the floor (no wondering why the tiles cracked then), so i am going to assume that the floor needs more adequate boarding. I have been advised to lay at least 18mm marine plywood to make sure that the tiles dont suffer from deflection and the same thing happens again. So this raises a few questions;

1) Is 18mm adequate enough? The customer has chosen 300x300 ceramic floor tiles and i intend to use 2-part flexible adhesive?

2) Do i fix the new plywood directly to the joists or do i screw it through the existing floorboards?

3) Are there any other pitfalls i should avoid


Thanks again!!!

 

[amsie]

Hi Parcy.

In my experience 18mm should be plenty enough, but check the condition of the underlying floorboards. If they are in a bad way they might require replacing. Fix to the floor evert 6 inches, but be careful when choosing your screw depth as screws too long can hit pipes underneath and flood the room downstairs. I usually start off at 20mm screws, then goto 25mm if theres no bite. 18mm ply +12mm floorboard.

I use a single part flexible adhesive personally.

Paul

 

[Ian]

Sort the deflection in the floor first, then overboard with a cement board (glued and screwed), a much better surface to tile to.

 

[Mr T]

also make sure the floor boards are correctly fixed down

 

[Ajax123]

Remove the deflection first or no amount of board on top will help...

 

[DHTiling]

Hi Guys (and gals),

Im tiling an upstairs bathroom floor at the weekend and wanted to double check im not going to mess it up!

The customers tiled floor is cracked and you can feel quite a bit of movement in the floor (no wondering why the tiles cracked then), so i am going to assume that the floor needs more adequate boarding. I have been advised to lay at least 18mm marine plywood to make sure that the tiles dont suffer from deflection and the same thing happens again. So this raises a few questions;

1) Is 18mm adequate enough? The customer has chosen 300x300 ceramic floor tiles and i intend to use 2-part flexible adhesive?

2) Do i fix the new plywood directly to the joists or do i screw it through the existing floorboards?

3) Are there any other pitfalls i should avoid


Thanks again!!!

Are you a tiler.. ?