Laying 600mm x 400mm limestone advice

[Daz]

Decoupler seems overkill in my opinion.
Prime with neat sbr type primer and use Ardex 7001 addy.
Do a test cut with grinder and if it chips up, you will need a decent wet cutter.

 

[Kevbos]

Easiest option offer the possibilities to the customer .you can only advise.