What should be the pitch of purlins for facade panels docke berg?

I did not do horizontal purlins for the house of SIP-panels, as I considered the vertical sufficient for strength, and the horizontal lintels clearly would have a negative impact on the ventilation of the facade.

The vertical spacing was about 40 cm, I don't remember more precisely.

The horizontal substructure is the main one, you can't do without it, the panels are shifted horizontally.

As far as I remember, there is a video instruction on the manufacturer's website. There is also an instruction manual.