What do I put behind the new walnut wood panels on wall?

[John McAllister]

I got a really good deal on some rough walnut planks and was able to use the seller's equipment to prep for installation. 

What should I put behind the walnut? Installation and then walnut? should I put something else up before?

[David Lee Hall, III]

@Will Fraser I agree except for one piece. Drywall is solid and seams taped. Seams on the wood will be open, even if small (does not look to be tongue+groove). I would throw up some 2-6mil plastic and tuck tape or acoustic seal around the edges. Since there are gaps around wires and such, this will prevent drafts from the basement/attic from working their way through the planks into your living space. It could also help with bugs but that would be a secondary concern. Exterior wall should be insulated like normal. The wood looks nice.