Help!: slc over parkay flooring need advice.

[CJ CERAMICS]

hi all just been out to price up a hallway which is a total of 8m2.
the hallway is to be tiled in gulf stone 300 x 300 tiles in white and black layed in a chess board pattern.
the customers have lived in the house since january and are in the process of renovating.
The main problem that i have is the kitchen floor. it has been tiled, then it has been tiled over the tiles and then it has had laminate laid over the top.
this has created a step of over 1 and a 1/2 inches from the hall to kitchen height.
they are not in a position to renovate the kitchen yet.
the hallway floor is carpeted with a parkay floor underneath. this has been fitted over an ashphalt floor. they have already done the living room which is one of the doors running off the hallway so height is an issue.
what they want is for me to keep the level in the hallway the same as the height in the living room.
what i want to know is.....is there a slc that can be applyed over the parkay floor to give a good tiling surface for these tiles.
they are happy to have a step into the kitchen as they will be dropping the level in the future but do not want the parkay taking up as they feel it will create to big a step and through out the living room. any advice will be gratefully received.
thanks
chris

[Dave]

It will need to come up IMO....not a stable enough substrate to tile too even if it was slc'd..

[trevortine]

Im with dave, really need to lift that before putting down slc. Dont want any comebacks. Talking of slc, went through 14 25kg bags of it today!!!!

[smurf21]

Im with them parkay will have to come up most parky is only laid onto a pva type adhesive so doesnt take much shifting i would take up and replace wth ply to the same thickness then make up the diff with an NMP board.

[doug boardley]

father in law layed vinyl tiles over his parquet, and they're all lifting, he was put off doing it right when I told him to lift the parquet, prime, slc and I'd tile it at cost (20m2 ish), he wishes now that he'd heeded my advice

[brian c]

im with the lads...lift it up.In general if unsure...lift it.

[Big D]

All advise above is spot on if it was me I would lift parquet and remove all adhesive and then I would make the levels up with slc and granno chippings so depth can be made up to required level.

[CJ CERAMICS]

i think its save to say that the advice is to rip up the parkay flooring.
i thought it might be i will inform customer of this and let you all know
thanks for the advice.
chris