Hi, is 20mm tile backer board suitable to lay directly onto floor joists to replace the old chipboard & then tile on top of? Is it strong enough for that? Cheers, LJ.
No. Tile backer board cannot replace floor boards.
- remove existing floor boards
- fix battens to the sides of the joints
- mount at least 18 mm thick marine ply in between the joists on top of the battens
- cover newly created floor with tile backer boards and proceed to tiling
I am happy to assist if you have any questions.