Tiles bowing after fitment

[Old Mod]

That will explain the fact there's no lipping then! Haha
Apart from that, as I mentioned, adhesive bed sounds deep.
If your prep is good, and I'm gonna go out on a limb here! I reckon it probably is. Haha
It shouldn't need to be that deep.
That's almost the thickness of the tile.
Which Bal adhesive is it?

 

[square sticking]

3-fall,
I am using Bal max-flex fibre wall and floor adhesive. The instructions on the reverse of the bag say to "comb to the required depth (normally 3-6mm)" that must be fitted depth rather than notch size on the trowel.
I do have a 8mm notch trowel so I could drop down to this on the other two walls and see how it goes. The maths say that a 8mm trowel at 45 degrees gives a bed of 5.65mm and the lash clips are 5mm when not tensioned so it's all a bit tight.
( sorry I went a bit geeky for a second !)
I think in practice the adhesive lifts up out of the back of the trowel and ends up deeper than the maths would say if that makes sense.

And yeah I think my prep has had enough thought put into it, you would shake you head in disbelief I think, surface to say the bathroom has been several years in the making....
I wish I wasn't me sometimes 😵

Cheers Pete

 

[Old Mod]

Engineer? Haha
I suffer the same fate!
The depth of the clips at the base are 5mm?
So you need a clearance of 5mm beneath the tile to fit them?
Just want to be clear.
If that's the case, I'd guess at more adhesive, not less.
When using a 10mm notched trowel and you rock the tile back and forth to break the ribs and completely bed the tile, with the compression of the adhesive this gives an average depth of 3mm.
So in effect, your light of adhesive through the centre, so when the adhesive dries, because you don't have a solid 5mm it's sucking the tile back into the wall.
Most quality levelling straps have a maximum depth of about 2mm at the base, allowing them to easily fit beneath the tile.
5mm is massive imo.
Well this is my best guess at the problem. haha
Never experienced it myself, to my knowledge anyway.
Another member may look later and tell me I'm talking cods wallop! Haha
But one thing is for sure, the more solid the base of adhesive, the less chance you have of it shrinking back and pulling the tile with it.
When the adhesive looses its moisture, crystals are formed, effectively mechanically fixing it to the tile.
It's a very strong bond.
So if you have voids beneath, it can pull the tile in to this void.
And if your tiles are effectively suspended around the outside then I'd imagine this is what is sucking the tile in.
But as I say, this all conjecture, because I'm not actually 100%
But it sounds feasible to me at least.
Oh and easiest way to distinguish porcelain from ceramic is to put your tongue on the back of it. 😕😱
If it sticks, it's ceramic, if not, porcelain. Haha

 

[Italy]

exact marc.
the first thing I thought of, is that you have expressed.
the tile, it seems to be white paste, absorbent.
and self-leveling, could create the problem.
3_fall good, unfortunately, my native land, does not allow me to express everything you have said.

semi-rapid adhesive, could solve the problem, otherwise eliminate self leveling. 🙂

 

[square sticking]

Thanks both,

I am going to try with some Rubi levelling clips as these are 4mm when not tensioned where as the lash ones are more like 6mm.
I guess when tensioned the lash ones perhaps go to 3mm at a push but they would have to be really pulled tight.
I will let you know how I get on, thanks again.

Ciao, Pete

 

[Old Mod]

The Rubi straps are what I'll use out of choice.
You barely need 2mm to insert them.
Make sure you soak them first, you'll get a lot more feedback Thro the pliers.
They are a nack, like all these things.
But if you find yourself snapping them, use two cups not one.
It'll help you find that spot before it snaps.

 

[Stef]

I never read some of the comments on the thread but you could be suffering from shrinkage as the addy may be deeper or shallower in the middle of the tile.
A lippage system would & will solve this kind of problem.

 

[White Room]

Could be suffering from OCD not shrinkage....

 

[square sticking]

What is OCD ?
Does it stand for Ordinary Ceramic Distortion ?

🙂

 

[White Room]

Don't try and be clever, you know what I'm talking about.