Gap in Marble tiles

[noobtiler]

You don't use slc on top of the ditra just spf

no worries thats why I put it below the matting since ditra want at least 2mm of adhesive or compound seperating the ufh from the matting

 

[bal]

Hi guys

I have 500 x 500 x 18 marble tiles to lay, only 3 sq metres but heres my problem! My client wants no gaps between tiles and wants it to look like a central london banking hall - smooth and flat like glass. How do achieve this? Understand 2 or 3 coats of sealer... But underfloor heating is installed so will this make the marble expand and contract making the no (expansion) gap between the tiles a hindrence? Please help! Wots my smallest gap u say?

You ll be ok with 1mm grout lines, its only 3m2.