Limestone / Hardie / Chipboard ?

[tomo13]

Have been told by Schluter tech that as long as the floor is even and load bearing it can go on old tiles. But am I willing to take the risk ??????????????? it came across like it was a bit of a standard reply from them.

 

[tomo13]

Also have now spoken to a guy at Dural and he said, as long as the adhesive will bond to the substrate be it tiles, steel or whatever then Durabase is excellent for those types of situations. it might seem like I am trying to talk myself into it, but it would be very handy if in the future I don't need to take tiles up if they are solid and the customer wants me to go over them and there are no height issues. I always prefer to take them up but as you know trying to get tiles up that are stuck with 2 part is no fun.

 

[AliGage]

Im interested to know how any tiler could offer any guarantees of non-failure going over an existing tiled floor if you have no idea how that floor was laid and by who.

 

[Qwerty]

Im interested to know how any tiler could offer any guarantees of non-failure going over an existing tiled floor if you have no idea how that floor was laid and by who.

My thoughts exactly Ali

 

[tomo13]

As I said in my post, I prefer to take them up. But if a customer is adamant that they are staying and they are solid, no signs of cracking, loose tiles or damage etc. Then it would be interesting to know if these products are designed for these kind of scenarios, and this is what I am trying to find out by contacting the tech depts., as these are the people that should know ?

 

[Stef]

As I said in my post, I prefer to take them up. But if a customer is adamant that they are staying and they are solid, no signs of cracking, loose tiles or damage etc. Then it would be interesting to know if these products are designed for these kind of scenarios, and this is what I am trying to find out by contacting the tech depts., as these are the people that should know ?

"These are the people that should know"
Yes they should but I would take what they say with a pinch of salt.
I foned Mapei technical about a Gyvlon screed & they told my that I don't have to bother with the screed being 75% RH & below as that's only for carpet & wood coverings, not tiles!!

 

[AliGage]

The only person that knows the condition of the current installation is the tiler that fixed it. In my opinion.
Lost count of the amount of times I've removed what looks like a sound floor but once pulled at the tiles all delaminate easy.
I don't tile on tile as a rule because i can offer absolutely no guarantee that the floor Im going over won't fail.

 

[widler]

I've used 12 and 6mm on a 50m floor,in some areas I've had to double up.
Some timber and some concrete.
It now all feels like a solid floor,I know they say the addy underneath the boards is for voids ,but it does defo does make it more solid feeling ( and I don't mean it stops it bouncing)

I would tile over floor tiles no problem,if they were solid,it's quite easy to check,hammer and bolster ,have a crack at taking up,of they come up in ikkle pieces ,tile over them,if they come up easy take em up.
It ain't rocket science .
You all tile over a plastic membrane,which the tiles stick to ,it's plastic ,so why would tiles not stick to a solid tiled floor ?