Thickness of grout line query

[Henry Lloydd]

Fired Earth recommend using a 3mm grout thickness on their 200x100mm tiles when fixed onto plaster, to allow for movement. My tiler has gone ahead and used 2mm spacers, he says he always does this for walls. Could i have a problem. British Standards say a minimum of 2mm.

 

[Steve the tiler]

You normally as a rule use 2mm on walls
3mm on floors

 

[Steve the tiler]

You normally as a rule use 2mm on walls
3mm on floors