Just after a bit of advice , I'm going to tile my bathroom floor which is chipboard and solid . Its about 2.5m2 so I was thinking about using hardibacker 6mm to cover . What adhesive would you suggest for sticking the board down with and what screws also what grout and adhesive would you suggest for the tiles ? Or do you suggest a different method altogether .......

Thanks
in advance .....

Hi there,

For all the size of the bathroom and as you say the floor is sound and no movement I would just go with Bal Fastflex cheaper option works well and you wont have a step into bathroom also use widejoint flexible grout.

There will be various opinions use this and use that, end of day Bal make a really good product it does what is says on the packet and as long as substrate is sound I would have no problem using it on your floor.

Highlander

Single part thin bed to bed the boards, this removes any voids, and then same on top and you shouldn’t have any problems. BAL Supaflex grout, happy days.

I do miss tiling!

Originally Posted by Holohana

Single part thin bed to bed the boards, this removes any voids, and then same on top and you shouldn’t have any problems. BAL Supaflex grout, happy days.

I do miss tiling!

Got to disagree with you here mate Single part aint for chipboard if he is going to lay Hardibacker he will still need to use Fastflex to stick the boards to the floor and still screw down. You would get away with single part on Plywood. Unless you are telling me Hardibacker recommend using single part flexible adhesive to use for laying their boards on chipboard???

Highlander

I've tiled on chipboard floors (the green one) and used soverign porcal flex and when sticking 6mm hardie boards with sbr mixed with porcal flex, Never had a problem, Floors had no deflection

Originally Posted by whitebeam

I've tiled on chipboard floors (the green one) and used soverign porcal flex and when sticking 6mm hardie boards with sbr mixed with porcal flex, Never had a problem, Floors had no deflection

Aye but if it ever did go wrong it would be on your neck. If you want to cut corners by all means feel free but end of day it does not say on the bag to use it on chipboard or does it? as I never used soverign porcal flex.

Each to there own just would not cut corners at the prep stage.

Highlander

It's only small floors and thats under pressure from clients, Allways give them a warning what might be, Then the balls in there court so to speak

I agree with higland. I'd probably recomend a standard W/J with the GT1 admix, for a bit of extra flex.

I've been reading this type of problem with interest and wondered if someone could advise the best option for me.

My bathroom (about 1800mm x 1200mm floor area) has been floored with sheets of T&G chipboard and from what I have read the general consensus is to cover this with 12mm WBP plywood, screwed at 12-16" and then tile over the top, with a flexible adhesive.

A few questions then.

Should I use an adhesive (in addition to the screws) when laying the ply?

If so, any recommendations as to a brand/type?

What type of screws are most appropriate for the job?

Is there a particular adhesive that would be best for the tiles being laid?

Lastly, does this type of job necessitate any special grout?

Many thanks for your advice.

Hi Welcome to the forums. If you want to use a single part adjesive then you really should be putting a minimum of 15mm ply down to avoid problems with manufacturers warranties. If you don't want such a big step and will continue with the 12mm ply then I recommend you check out Ardex-flex 7001 adhesive. it is specially designed for this type of installation. You should seal the back and edges of the ply with polyurethane varnish before laying the ply and screw INTO the t&g boards at no more than 300mm centre (smaller if you have the patience), prime the tiling surface with neat Ardex P51 primer and allow to dry, then commence laying your tiles.

Sorry, I should have asked this one first time round ... is it a typical practice (noting the small space that I am working with) to use the ply in plank form, covering the floor with a number of pieces (staggering joints with the T&G underneath) or should I be trying the craziness of laying the PLY as a single sheet (I can't see that to be possible). When pieces of PLY butt up to each other, what should I be doing about those edges? The same as just suggested for the outer edges, I guess?

You can get ply in 2440x1220 sheets so should fit straight in with only minimum cutting.

But with the "whites" already fitted, I'll have to either cut the PLY around them or would it make more sense to lift them out, do the tiling and then put them back in? In asking, I realise that the finish would be better, if I did ... and if that's the case, I guess that my builders could have done me a favour and spoke to me about this before they plumbed everything in.

On Mapei's adhesive selector they say that, Ultramastic III, Keraflex maxi, Keraquick with latex plus, Granirapid, Elastorapid, S2 Ultraflex mono and S2 Ultraflex quick can all be used on chipboard. I have'nt used them on chip floors