Plywood, OSB or Cement Board? (external frame wall)

[BotusBuild]

Hi all,
I have built some external frame walls (studwork) below and alongside some windows. My question is what sheet material should I use on the outside (exterior) of the studwork?

 

The exterior will be clad, most likely, using stone slips, the build up will be:

• sheet material (the focus of this question)
• weather resistant material (Visqueen or similar?)
• wire mesh
• scratch cost
• mortar setting bed coat
• stone slip

 

Any handy diagrams will be appreciated 🙂 

[BotusBuild]

*scratch coat 🙂

[BotusBuild]

Anyone got any comments on this please

[BotusBuild]

To help, here is a picture of one such studwall - the gaps will be filled with PIR and foamed round, ( outseide lat

Edited July 31, 2023 by BotusBuild

[Mr Punter]

One issue will potentially be the weight of the stone slips on a timber framed structure.

 

If you are doing rainscreen cladding on a timber frame you need a minimum 25mm strongly vented air gap between the sheathing and the cladding.

I think you should be looking at a proper system with BBA approval.