How do I prep a rough stucco wall to put shiplap over it?

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My screened in porch was an afterthought. The walls are the exterior of the house. How do I “cover” them? Do they need to be sanded smooth first? I’m open to other materials & solutions as well!
q how do i prep a rough stucco wall to put shiplap over it
2 full stucco walls and 2 half stucco walls.
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