Plywood or Backer Board?

[superflo]

I'm about to tile my kitchen with 600mm x 600mm porcelain tiles. I am tiling onto a subfloor, which already has 22mm floorboards. When I previously tiled onto this floor I used 6mm Plywood, this was 12 years ago. I am planning in ripping up the old tiles and 6mm of ply. What Im now trying to understand, is whats best to use 6mm Hardie backer or 6mm Ply, Ply is less hassle. Any thoughts?

Thanks.

 

[Discothetiler]

Cement boards glued and screwed. Don’t run the risk of the floor failing

 

[Discothetiler]

Alternatively you could use a decoupling membrane such as ditra mat which is a good bit less hassle than the cement board

 

[Dave]

6mm hardibacker, make sure floor boards etc are well fixed prior.

 

[Sevian1s]

If there's any movement in the floor, tiles could crack no matter what you use. Backer board is the safer option since it won’t expand or contract like plywood with moisture.

 

[Sevian1s]

I wouldn't bother with 3mm plywood under tiles, as it just doesn’t have the strength to stop movement. Tiles need a solid, stable base, and that thin plywood is too flexible, which can cause cracking over time.

 

[Dan]

No plywood can be used now at all. Even 22mm marine. The quality isn't good enough anymore.

Must use tile backer boards in all cases involving floorboards even when screwed etc