Laying tilebacker boards on chipboard

[neelpeel]

Ok, before I get berated for not reading the sticky, i have read through it but still want to ask this (great stickies by the way...very informative and well structured).

I'm going to be laying slate tiles in my kitchen, with electric UFH and insulation boards (Marmox). I'm wondering, will it be ok to stick the insulation boards directly onto the chipboard using flexible adhesive?
(i could do without the extra height of ply as it will interfere with the white goods)

 

[Moz]

I would take the chipboard up an put ply down as the substrate tbh .....

 

[Jasonb]

The various insulation boards do not add any structural strength to the floor. Either overply the floor and use the insulation value of the 12mm plus ply instead of insulation board.

If heat loss is an issue do as the bathroom I'm working on at the moment: existing 22mm T&G on joists at 350cts, will overboard with 12mm ply, stick 12mm insulation to this with flexi adhesive, fit heating mats then stick tiles with more flexi, job done.

Or do as moz says take up the chipboard and replace with ply, if you are really bothered by heat loss fix some 50mm kingspan/celotex between the joists first.

Jason

 

[neelpeel]

Thanks for that.
I'm assuming that the chipboard is already strong enough as its only lino thats on top at the mo and its been fine for the last few years.

I thought i'd figured out the solution...using screws with penny washers i should be able to secure the insulation boards to the chipboard (as well as using adhesive).

However, i've just taken up part of the lino and most of it is glued!

I could scrape off the glue as best i can, then use flexible adhesive and the screws/washers, but i'm not sure if the adhesive will take.

Any thoughts?