Tiling bathroom floor

[Jon E]

I have recently tiled my bathroom floor. As the floor is plasterboard paneling, I sealed the surface before tiling. Unfortunately, several days later, the tiles began to make a crunching sound and the grout began to crumble. As a novice I am not sure why this is happening. Please can you provide any help.

 

[breezer]

I should presume the "crunching noise" is the plaster board? ideally you should put marine ply down first screwed down every 8 inchesthen fix to this, the grout is coming out because the tiles are moving, soon they will be moving too.

 

[Jon E]

Thanks for the reply.

The floor is actually chipboard and not plasterboard as I previously stated.

Would your answer still apply for chipboard ?

Thanks.

 

[masona]

Sounds like you're not using enough floor adhesive.This is important when I say floor adhesive which allow for flexibility