Large marble slabs

[chas]

Hi all and happy New year
I'm looking for a second opinion on what to do.
I have book matched marble to lay on floors 20mm thick and up to 2.4m long and 900 wide although the lengths can be smaller as supplier is cutting the majority of pieces to size.
I have 10mm height to reach finished floor should I just do this with adhesive possibly bal pourable or should i lay some laytex?
Is £80m2 to fit and supply adhesive sound a reasonable price I will probably spend 1/2 days transporting slabs in to the building and to various floor levels.
Thanks for any opinions
Charlie

 

[J Sid]

They are big and very heavy 😳
£80m2 is a bargain imho
Must get the floor prep spot on and flat before you even thin about laying a slab
Need more info about sub floor etc