Pack of back boards delivered separately and we're discoloured and in some of them poorly finished as well as soaking wet. The build quality was poor. Roof slats had to be released nailed and the genreal quality poor. I would have returned it but had logs waiting to be stored and only discovered  the poor quality when I was  half way through the build. I would like some compensation  for this under spec product. The green is the treatment  leaching out.