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.

Dear LJ,

No. Tile backer board cannot replace floor boards.

You should:

- 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.

Kind regards

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