Hi guys, advice appreciated on 400 x 400 limestone tile

[on-the-tiles]

Hi everyone,
Just looking for some opions really....
i have a job coming up which is 30sqm of 20mm honed limestone tile. sub-base is 1/4 chipboard which i intend to lay marmox onto, the rest of the sub-base is concrete, the floor has been screeded by the builders and as a consequence leaves me with a very uneven base for these tiles. To increase complication i have loose cable heating cable to lay prior to tile fixing,

So... My train of thought is 1) Get the sub-floor reasonably level, taking out the larger areas of highpoints then laying the heating cable.
2) Lay a bed of flexi addy over the cable , levelling as far as possible as i go.
3) I have purchased the rubi tile levelling kit to assist with the foreseable lippage issues.


I have the Mapei marbel & stone adhesive, lithofin stain stop, i am trying to cover every possible issue but am still slightly nervous , these tiles are costing £2500 plus fixing equipment,


your thoughts and opinons are hugely appreciated , Just wanted to share the job to ensure im not missing any vital components,

 

[The Legend; Phil Hobson RIP]

Hi mate when you say quarter inch chipboard, alarm bells ring for me. Marmox will not help with deflection issues, also you will need expansion joint between timber and solid sub floors. A bit more info would help.

 

[on-the-tiles]

Hi phil,
sorry, a quater of the floor is 22mm chipboard, the rest is concrete, I have used marmox on the chipboard many times with no issues is there an issuse there?

- - - Updated - - -

its a house which has been extended over the years and subsequently has differing sub floors

 

[The Legend; Phil Hobson RIP]

Sorry I read your post wrong, if the floor is totally deflection free then marmox glued and screwed should be OK ( deflection free being paramount) but you would still need expansion between the two sub- strates imo.

 

[doddy41]

As you are having ufh i would be using ditra

 

[nybor62]

agree with both phil and doddy
as has it happens i have a roll of ditra for sale ,:smilewinkgrin:

 

[Tony73]

and i need 40sq.m of ditra,