Expansion joints ( how often do i need them ) - Tile Advice

[CUSHY]

Hi everyone

I havent posted for a while ive been asked to price a tiling job its around 185m2 with ceramic 300x300 tiles on a concrete floor all of which im fine with
my only question is how often do i need to fit expansion joints and which are best to go with and where to get them i was thinking of centering them
like a cross + any advice on this would be greatly appreciated

Many thanks

John

 

[Perry]

5.4 mts if i remember