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.