Tiling on Partical board , loft board

[shaunylocks]

Hi all

am shaun been tiling for about 8 years self employed from mirfield west yorkshire

am doing a job for a customer whos builder made a **** up on a massive scale by getting a tiler to tile directly on to an anhydrite screed having not sanded it and used cement based adhesive , it failed i had to re-tile it also the same builder tiler tiled in a separate part of the house onto (loft board, partical board )its tongue and groove greeen in colour 22mm thick as a waxy coating ( see attached ), now a tiles also cracked on there and i've taken it up to change it reviling this board , now i have always been under the impression you can not tile directly onto this board and always over plyed . am i right if so the whole floor is doomed .

thanks looking forward to your comments

 

[kilty55]

hi shaun i would not tile onto that as you say

 

[shaunylocks]

Hi thanks for your reply , the builders saying there the bees knees and that they defo can be tiled on , hes got me questioning my own judgement , think its cos hes older and the extension on the house its really quite good, but i've always over plyed this particular floor , can't see how the adhesive can bound to the waxy surface

 

[CJ]

Don't let the builder question you. Overboard with hardi backer, then tile.

 

[White Room]

Hardie glued and screwed.....

 

[Alan.P]

The builder is trying to cover his backside, the tiles will have to come up, overboard as above, and tell him to naff off 😉

 

[Andy Tiler]

As above overboard!!

 

[Stef]

The only way you can tile direct to green sheets (caber deck flooring) is with an elastomeric adhesive & I would still advise against this.
Clean up them boards, make sure they are well fixed, prime & glue & screw with Hardie backer as said above..

 

[Mr T]

Off topic what do you do with the joints when you lay hardie backer boards? How would you fill them in or is it ok to be just glued n screwed then tiled onto?

 

[Stef]

Off topic what do you do with the joints when you lay hardie backer boards? How would you fill them in or is it ok to be just glued n screwed then tiled onto?

I just run a screed of adhesive over the joins, either when I lay the boards or when I fit the tiles.

 

[Mr T]

Sweet mate

 

[White Room]

I used to use standard scrim but hardie do sell there own scrim and the cheapest place I've found it was B&Q, when fixed run some addy over it....

 

[lizzardtong]

how about ditra ? insted of hardi backer board? would that be ok ?

 

[Andy Allen]

Is the floor a floating floor...?

 

[lizzardtong]

its old house with the cellar so froor is a timber one. I'm thinking to put some screws in, prime it level it of with slc and then ditra on top.