removed tile and need advice on reinstalling

[jeremy0000]

I removed slate tile from my deck today so that I can install a Ditra waterproof membrane underneath, (been having problems when it rains). The tile is 12” square installed over cement backer board. I am going to reinstall them so I made cuts in the grout that encompassed 4 tiles, 2’x2’ and the cuts went through the backer board. Using a hammer and pry bar I pulled the backer board along with the tile off of the ply-wood substrate in big 4 tile squares. It came up very nicely and intact. The backer board is nice and smooth on the bottom. Question is, after I install the Ditra membrane can I reset the old tile with backer board and all? Backerboard is ¼ “ and maybe half inch of thinset between backer board and tile. Would this be similar to installing really thick stone?
Also I am thinking about installing metal flashing where floor meets wall underneath the ditra, just for added protection. Thoughts?
Thanks in advance, I really appreciate the help!

 

[suave]

:welcome:

 

[nybor62]

welcome could you upload some pics pleas

 

[Perry]

where are from ? deck cement backerboard ply outside ? sounds like U S of A

 

[AMtek]

Think you will probably have to can it all, the backer boards need to be screwed too and you have no way of taping the joints in the backer boards if there are tiles stuck to them

 

[Perry]

Think you will probably have to can it all, the backer boards need to be screwed too and you have no way of taping the joints in the backer boards if there are tiles stuck to them

why would he want tape the joints ?