Hello
I've read all the posts on this subject and all through, almost to the end, some members have been asking for further info on preparation, adhesive, grout and installation method used. - Clearly either, you have not done something correctly in the prep, or used in appropriate products for the application, or maybe the product failed due to manufacturing, storage or specification.
Good folks like John and others have all tried to help and asked a variety of questions, aimed at trying to understand what has gone wrong. Mostly its because they want to help and partially its because some of us use Granfix products from time to time - [as we do] and we try to gather as much info as we can to avoid similar issues.
I do not use the adhesive that you have used, however it is probably a premixed water disperstion gypsum based addy. Could you please supply some more info on the application / prep / substrate etc
1 What substrate did you tile on to. was it sound etc - type ? ?
2 Was the shower wet area tanked and if so what with ?
3 Are my assumptions re the addy correct - If not please correct ?
4 What was the time scale / weather-humidity etc between tiling and Grouting ?
One thing for certain, pre-mixed addy is not waterproof or suitable for showers / wet areas - Only use cement based product.
Tanking is critical - no tanking - no waterproofing
And finally - All grout [except Epoxy] will let water through - although adding polymers and SBR etc will stop some water ingress, and if you have used water dispersion type addy, then after a short time, if water leaks through the grouting, the adhesive will revert back to a soggy dough - ie similar to the state it was it the tub, and heh-presto your tiles fall off.
Hope you will be able to help us with some more info Mr VP Proddy - We look forward to your reply post etc
Thank you