Tiling open porch

Sorry to hear that eta. How did you build up the base in the end and how did you form the gradient? In addition to trowelling the floor did you back skim each tile?

i used rapid set concrete - screwfix no-nonsense to get the gradient i wanted , so then the adhesive was not making the gradient and just a 10mm square notched trowel for applying the of adhesive. i also called and checked with Norcross what to use as a substrate and this was the only material they said i could tile over immediately with their slow adhesive.
No I did not back skim any tiles , but i did make sure on the first one, i pressed down and wiggled. i re-lifted it to see and check the coverage of adhesive and it was all over.
Norcross have agreed to come over and look at the porch, which i have delayed till the new year, as I don't want a tile lifted and then causing a trip hazard.

You sould always back skim floor tiles to get a proper bond. I'm guessing this is all the only thing causing the problem. If you lift them you'll probably find very little adhesive stuck to the back of the tiles. Are the tiles porcelain?

yes, porcelain

Porcelain tiles are very dense and unless you back skim them sometimes you struggle to get a good bond. To be honest I back skim most tiles that I fit, it's a habit I've got into and definitely improves the bond/coverage. Hopefully your tiles will lift and clean up ok and I'm sure that if you back skim when you re-tile you'll be fine.

Thanks, any suggestions on best way to lift them all ? limiting any damage

No tricks that I know of, just go gently with a hammer and crowbar or strong scraper.

OK, thanks, lets hope its not worked at all and they lift otherwise, i'll just buy more and try and get the old adhesive off, and just replace the middle lot , otherwise I will have to remake all the sides and step, which have all been filled with Pro3 silicon/adhesive. i know those cut tiles had been put in at a greater angle to help drive any water away - strange as i did check the coverage on a lifted tile and it was a good 99% if not 100% all over
Will wait for the new year and better weather now, and inspection by norcross

We had an issue when the bathroom floor tiles fitted, by some guys redoing the entire room, and they used bostic , adhesive i think, certainly a well known brand name i knew
they left over easter to set and when they came in on Tuesday , they were taking them up as the adhesive had not set properly

Finally lifted the full tiles Porcialian 33x33cm tile.

The surrounding tiles, which are now the main issue. see image on post 9

They have all been cut and now are under the door step and also have wood marine ply and redwood on them, and I have used mastic CT1 to make sure they are all sealed in and weatherproof.

I dont want to remove these tiles. I have removed all the centre 8 off full tiles now, a couple still have adhesive stuck to them , but not much.
I have removed the adhesive from the step so back to the concrete

no damp - norcross inspector also tested for damp - green light.

Norcross have inspected and said the adhesive did not fix to the tile, and that i needed to have buttered the back of the tile, exactly as suggested in above post replies .

I used a 10mm comb trowel with norcross adhesive, and did also SBR

They have provided a new bag of S1 Standard Porcelain Adhesive, and also said to SBR again before i relay the tiles and said i seem to have done everything correct, NO Damp detected by their meter , which is meant to go down 30 inches.

SO to the question
What can i use to stabilise the cut tiles around the edge , it has been suggested I use a resin, Thixotropic Injection and Laminating Resin - structural adhesive , which with cleaner, syringes comes to about £65

Just wondered if anyone had some suggestions as to what i could just squirt underneath before i retail the centre again.
CT1, grout, cement or use the resin
????

thanks