Control Joints in Villaboard for a Bathroom

Hi All,

First time poster. I was hoping to get some advice on villaboard installation within a bathroom.

I have installed villaboard before, in a laundry. I think I did an OK job but I want to make sure I do it better for the bathroom.

I've read the James Hardie installers guide
https://assets.ctfassets.net/rg5y8r6t6c ... _Apr23.pdf and everything is clear apart from the "control joint".

I get what it's for in principle, but I don't know whether it's relevant for a bathroom of my size. The longest wall run will be 3.2 metres which is underneith the 4.2 m's which they state for a wooden stub wall to be tiled.

Do I need to install a control joint and if so where would that be? There aren't many resources on the net that discuss this.

Just to add, I'm having professionals install everything else, from the plumbing, electrical, wall leveling etc. I'm just installing the villaboard.

Thanks in advance!

-Richard