Advice on porcelain tile movement. Grout coming out of tiles. - TilersForums.com

[Dumbo]

They haven’t but maybe someone has.

Sounds like thermal shock to me, pics will help.

If the spec is what they say it is unless the tiles have been spot fixed im going to blame 6mm ply all day long

 

[J Sid]

how do u know the correct slc was used, adhesive was used.?
yes the ply is wrong, but may not be the cause of failure at the stage

 

[Dumbo]

how do u know the correct slc was used, adhesive was used.?
yes the ply is wrong, but may not be the cause of failure at the stage

To be honest you are correct but where I shop they only sell flex adhesive and levelling suitable for timber , ufh installations so yes I am making assumptions
My guess when they say change adhesive they are going to move to an s2 which probably still won't be good enough if the prep is wrong

 

[J Sid]

sadly we can't assume anything...... I've got a 100m2 floor onto ufh with a sub base of floor boards starting on Monday. I price for all the work but the electrician talked the customer into letting him do it as he will give a 25 year guarantee on his work. I've told him how I want the preparation done so I can tile it. He said the insulation boards don't need glueing or tapeing, the floor boards don't need screwing down first. What should I do? assume his method will be ok?

 

[Dumbo]

sadly we can't assume anything...... I've got a 100m2 floor onto ufh with a sub base of floor boards starting on Monday. I price for all the work but the electrician talked the customer into letting him do it as he will give a 25 year guarantee on his work. I've told him how I want the preparation done so I can tile it. He said the insulation boards don't need glueing or tapeing, the floor boards don't need screwing down first. What should I do? assume his method will be ok?

Don't really know what to say apart from no and leg it

 

[Waluigi]

When the tiles start to pop and crack the customers friends won’t be asking who did the prep work, they’ll be asking who tiled the floor.

 

[J Sid]

Don't really know what to say apart from no and leg it

if he doesn't give it to me in writing what he has done and what materials he has used, and they are fixed as per manufacturer instructions then I will have to leave it.
a week of maybe next week.

 

[Bathfix Bob]

Plenty of people using ply still, only today at a builders merchants I saw a tiler in a shiny new van loading up sheets of 6mm ply, heard them talking words to effect of get this down this morning etc.
They had a Dewalt nailer aswell.

 

[Brian the Tile]

Plenty of people using ply still, only today at a builders merchants I saw a tiler in a shiny new van loading up sheets of 6mm ply, heard them talking words to effect of get this down this morning etc.
They had a Dewalt nailer aswell.

I happen to be one of them tilers that still tiles on ply but not on 6mm (you might as well put cardboard down) surprising how many builders merchants sell it for floor tiling i always refuse ,i have never had a problem with the right thickness as long as it is laid correctly and the right adhesive and grout is used = no problems

 

[Waluigi]

Thinking about it. If I wanted to go and buy some ply for tiling tomorrow, I’d go and visit carpets and flooring in Camberley branch and buy some SP101. The only problem is that I think the thickest they stock is 9mm so I’d travel up the road to Buy some marine ply from Selco. Just checked. They only do 18mm and that’s £84 per sheet. I’ll stick with a TBB.