Cladding with 38x19mm vs 25x50mm

[ricardo100671]

Any reason why I should not use 19mm over 25mm roofing battens for gapped rainsceen cladding - have a large project and every penny count. Some arguments have been about splitting during nailing, but if they are used for roofing, I can't see that it would be an issue. Also is the difference of 19 vto 25mm ventilation gap really that significant.
 

[Russell griffiths]

Far to thin, I have used them under my soffits where I needed to pack them down a bit, I would not use them on a facade. 
not enough meat for the screws to grab hold of. 
 

Edited 47 minutes ago by Russell griffiths