Loose Floor tiles :( New Floor

[Southside691]

got an issue with 2 bathrooms I've just had tiled. So the issue is with the floor tiles which happen to be the same ones I have on the wall and are fine. The issue is that the tiles in both bathrooms have become loose and the grout has started to come away. Now the tiler has been round twice to rectify the issue but it's still there. I've spoken other tilers who I've asked to come round to fix the issue and some have suggested that the floor which was made up of cement board screwed to the joists needed a primer before the tiles went on and the other guy saying that he would have gone with ply. The cement board that was used looked like some generic board which was really heavy and had some sort of semi shiny covering on both sides. The builder who prepared the floor with the cement board said he screwed it down well and the adhesive used was UltraTile Proflex SP+ES bagged.

Any advice?

 

[J Sid]

has the adhesive stuck to tiles but not floor or floor and not tiles ?

 

[Time's Ran Out]

As a Tiler I want to prepare the substrate prior to tiling. That means adhesive and mechanical fixing of cement boards ( Hardie not shiney boards) taped joints and flexible adhesive. Now you have to determine who is responsible - builder/tiler.
Certainly don’t agree with your ‘tilers’ choices of preparation, Hardie doesn’t need priming and Plywood is not suitable as a finished over boarding material.

 

[Flintstone]

I've never seen a shiny board before? If it is a cement board, the bond to that with that adhesive is very strong. Could be movement in the sub floor ?

 

[J Sid]

I've never seen a shiny board before? If it is a cement board, the bond to that with that adhesive is very strong. Could be movement in the sub floor ?

may just be tiles not stuck to adhesive

 

[On one]

I've never seen a shiny board before? If it is a cement board, the bond to that with that adhesive is very strong. Could be movement in the sub floor ?

'Shiny',could be refering to NMP?

 

[hmtiling]

I hope it's not 12mm direct to joist. The 22mm nmp is good stuff and the adhesive mentioned is one I use very often without issue. Could be no priming. It will suck the life out of adhesive very quickly ruining the bond

 

[GoneGuy]

Sounds like no more ply boards?
Did the builder use adhesive under the boards to fill any voids?
Sounds like no primer used and dusty surface which could cause the tile to de bond

 

[Southside691]

I think the board that was put down was a generic hardiebacker board and it was supplied by the builders merchant. All I remember is that you cut it the same way as plasterboard with a Stanley knife. The builder is happy to pay for the works but I just want to be sure, this time it's done right.

Thanks

 

[Boggs]

I wonder if it was 6mm Knauff Aquapanel, that has a shiny top side and cuts with a knife.

 

[On one]

A bit of confusion going on here. ......you can't cut a cement based 'Hardiebacker' type board with craft knife.
You can cut an insulated 'cement coated polyurethane 'Wedi','Marmox' type board with craft knife

 

[hmtiling]

I think the board that was put down was a generic hardiebacker board and it was supplied by the builders merchant. All I remember is that you cut it the same way as plasterboard with a Stanley knife. The builder is happy to pay for the works but I just want to be sure, this time it's done right.

Thanks

Cut with a Stanley knife sounds like coated xps, which topps say on their website can go direct to joist. It cannot and will fail. You need to find out exactly what thus stuff is

 

[hmtiling]

I wonder if it was 6mm Knauff Aquapanel, that has a shiny top side and cuts with a knife.

Apparently this board is direct to joists

 

[Boggs]

Oh yeah,
Direct to joists and cuts with a Stanley knife, not sounding good is it...

 

[Waluigi]

I originally thought it was a shiny XPS but the OP said it was a heavy board which adds even more confusion into it.