Large format tiling adhesive question - Tile Advice

[ColmO]

Hi, new to this forum, I have a question, I am laying a lot of wood effect 240 x 950mm ceramic tiles on an poured Alpha Hemi Hydrate screed that is fully dried on Underfloor heating, I will seal the floor before tiling.
I wanted to use the evo-stik Technik LFT ( large format tile ) adhesive, but my building providers here only stock the evo-stik Technik OPF ( one part flexible ) they both are rated C2 TE - S1. The only difference I can see between them is that the LFT can be bedded thicker than the OPF. As I say I can get the OPF no problem at a good price.
Any one have experience with using these products or any advice,
Its great to get advice from people who know what they are doing with tiling,
Thanks for the help.
ColmO

 

[tommyzooom]

I find the opf is good.
I used it in a whole house with 75x75cm tiles a while ago.

 

[ColmO]

I find the opf is good.
I used it in a whole house with 75x75cm tiles a while ago.

Thanks Tommyzooom,
I got on to Bostik tech dept. and they recommended Bostik MC 400 as it is a C2FTE-S2 adhesive, so higher than the S1 of OPF and LFT. I havnt got it yet but it must be better than the two I was looking at.

 

[crooksy88]

Thanks Tommyzooom,
I got on to Bostik tech dept. and they recommended Bostik MC 400 as it is a C2FTE-S2 adhesive, so higher than the S1 of OPF and LFT. I havnt got it yet but it must be better than the two I was looking at.

Did you decide on an adhesive? Your job sounds similar to mine and I've been advised on two other options (both over uncoupling membrane).

Ardex X325 which is a pourable adhesive so the large format tiles don't need to be back buttered. (advise from Ardex)

Mapei Keraquick S1 with Mapei Latex Plus. (this ends up almost twice the price as Ardex) Advise from tile shop!!!

Would be interesting to hear what pro tilers would opt for. i.e. someone without a vested interest in pushing their own product.

 

[ColmO]

Hi crooksy88,
I went with the Bostik MC 400 as it is a C2 and S2, so the most deformable adhesive I could get, I got my local supplier to order it in for me, worked out around €21 a bag ( 20kg ). so far so good, though finding the wood effect tiles ( 950 x 240 mm ) awkard to lay with out some lippage as there is a slight bow in the middle. Found to my suprise that the self-leveling screed I a crowd pour over the UF piping was not level, had differences of 5 to 10 mm in each room. I tried to keep the first room laying the tiles level but found that I had to put a lot of adhesive under half of the tiles and this was even harder to avoid lippage. So I decided not to bother with level with the rest and follow the floor, you couldn't see the drop in level anyway and I don't have the skills or patience to keep the tiles level, we'll see with the next room how it goes.

 

[ColmO]

Hi crooksy88,
I went with the Bostik MC 400 as it is a C2 and S2, so the most deformable adhesive I could get, I got my local supplier to order it in for me, worked out around €21 a bag ( 20kg ). so far so good, though finding the wood effect tiles ( 950 x 240 mm ) awkard to lay with out some lippage as there is a slight bow in the middle. Found to my suprise that the self-leveling screed I a crowd pour over the UF piping was not level, had differences of 5 to 10 mm in each room. I tried to keep the first room laying the tiles level but found that I had to put a lot of adhesive under half of the tiles and this was even harder to avoid lippage. So I decided not to bother with level with the rest and follow the floor, you couldn't see the drop in level anyway and I don't have the skills or patience to keep the tiles level, we'll see with the next room how it goes.

In the end I had to put self lever on the floor, I just couldn't botch it by going with the floor, and it worked out fine. I used 10bags of the MC 400 tile adhesive on two small rooms, so I decided to switch to the lower spec. LFT adhesive ( Large format tile - C2 S1 ) also by Evo-stik/Bostik , as it was €5 a bag cheaper and as I was laying on poured screed it didn't need the extra spec of C2 S2 of the Bostik MC400. So far all is fine. Still finding laying these wood effect tiles a pain, but I am getting better at it.