grout cracking - Tile Advice

[jase158]

Used 6mm ply,
flexible adhesive
flexible grout

yet the grout is cracking

any help please..

 

[DHTiling]

6mm ply is the clue

 

[jase158]

i have seen this used before and it was fine!!

 

[DHTiling]

It is still wrong though... and hence what has happened..

 

[Brian the Tile]

6mm ply is no good to thin you might as well have put cardboard down sorry not being funny about it just truthfull,you would need 10 mm minimum and screwed not nailed every 100mm then sealed first before tiling

 

[jase158]

sealed with what?

 

[peteablard]

15mm minimum.....

 

[Brian the Tile]

ask at the shop where you get your adhesive at you can not tile strait onto the ply without it being primed first they will give you the right one for the job ,if you dont do it your tiles will fail again

 

[jase158]

they told me the adhesive could go onto anything, wood, plasterboard or screed

 

[Ian]

Some adhesive manufacturers say to prime the rear and sides of ply, not the face. That aside, use cement boards and the job will be a better one all round.

 

[jase158]

Some adhesive manufacturers say to prime the rear and sides of ply, not the face. That aside, use cement boards and the job will be a better one all round.

where would i get cement board and what size should i get?

 

[Brian the Tile]

what adhesive have you used ?

 

[kilty55]

6mm ply is the issue here i would think

 

[Ian]

where would i get cement board and what size should i get?

Most reputable tile shops stock them and a lot of builders merchants as well, two sizes that I know of, 1200x800 and 1500x900mm.

 

[kilty55]

6mm thick ones for the floors