The boards won’t be supported properly when placed horizontally. I would pop some extra studs in and put some long boards in. I tend to use CLS. It’s straighter.
What do you mean Waluigi, wont be supported properly when placed horizontally? Only because of the need for 30mm centers and he will have 40? But then he will need more studs anyway , even if placing vertically.
Also, for boarding stud work, the foam type boards should be minimum 20mm depth?
And then to clarify an earlier point for the enquirer, if you dot and dab the boards, then you need mechanical fixings as well, which is why Waluigi said about the drilling the holes where dabs will be etc. Dot and dab on its own, is not sufficient.