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


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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 🙂 

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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.

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