In message , Tim Watts
writes
On 16/03/16 17:53, The Natural Philosopher wrote:

worst case use masterboard behind the wood planks, if you need a fire
barrier.

That is not a bad idea at all... Could bond a thinner ply to the
surface to route grooves into.

I've seen grooved ply used as a wall decoration so you can probably buy
it ready to nail up.


--
Tim Lamb