what type of flooring to tile onto?

[smiley_mikey]

Hello everyone, hope you can help !

A brief description...
Just had a new extention built, 7.5 by 2.8m, 6x2" joists (2.8m length) at 400mm centres with line of noggins running through centre. original kitchen 4 by 3m with 18mm thick floorboards, approx 1m2 of concrete where old boiler was.

I was planning to rip up floor boards and lay new 18mm t&g v313 floor grade chip board over entire area, with exception of concrete, self leveling compound to same height of flooring only about 3-4mm.

have spent many hours looking at lots of threads about over plying, hardie board, tiling straight onto floorboards etc

would I be better using 22mm t&g ply board and tiling sraight onto that, or 18mm ply with 6mm ply or hardiebacker, joists seem pretty rigid, I don't want to much extra height.

What adhesives and grout should I use, I have settled on 40.6 square honed and filled traveltine tiles from topps. total area abou 30m2

I have done tiling before, but only small floor areas and used unibond tile on floor straight onto sound screwed down floorboards, but I can appriciate this is a whole new bal game:lol: sorry poor pun!

thanks in advance for any and all advice, have a limited budget as well !

Mike:8:

 

[faithhealer]

are the old floorboards no good at all, can't you save yourself the expense of new boards and just use Hardiebacker over them? 12mm is cheaper than 6mm at CTD at present?

 

[smiley_mikey]

hi

the existing kitchen floor boards are not very good, had previous water damage, and some replaced, so have decided to replace whilst putting new floor down in new extention.

 

[Tiler Dave]

hi mate. personally i wouldnt tile over any floorboards or even on to t and g chip board. Whatever u replace the floor with i think it would be best to use backer boards. if u dont want alot of extra height on floor then use the 18mm t and g boards and then lay 6mm backer boards screwed at least every 300 centers. I would then ues a single part flexible floor tile adhesive pref white for the tiles u have.
If u do the prep work properly u will be much happier with the job when complete.
Last thing u want is probs when u have finished and have to re do bits, or worst case take it all up again...