Weatherboarding as roofing

[salex]

I think I'll get shot down on this one but here goes.

I've been looking at weatherboarding, and found a couple of interesting products thermowood(heat treated wood) and marley cedral (cement fibre board)
This stuff is usually used as cladding.
but could it also be used as a roofing material?

Its appears on the face of it that its effectively doing the same job, in keeping out the elements

 

[Nige F]

purely decorative, over a felt, on a summerhouse, yes