My plan is to use horizontal rough cut white cedar for siding, I'm thinking of using 3/4"x8" boards with a 2" overlap, leaving an obvious 6" exposure. The mill tells me they can saw the boards square or with a bevel, 3/4" -> 1/4". I'm worried about the air space behind the boards, anyone ever installed like this before?
kwik is right, having a air space behind most types of siding is mandatory in most regions. it allows for air flow behind hte siding which allows the siding and the wall to dry thus reducing rot and possible leaks