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 11 hours ago by Russell griffiths

[gravelrash]

are finances that tight? couple of pence per foot difference just not worth the fallout like re-fixing in a couple of years

[torre]

11 hours ago, ricardo100671 said:

but if they are used for roofing

I thought 25mm was the minimum for roofing anyway, wouldn't use less 

[Mr Punter]

19 minutes ago, torre said:

I thought 25mm was the minimum for roofing anyway, wouldn't use less 

 

Any less would be bouncy and not reassuring to walk on.  Rafters would need to be 400 as well.