I thought I'd share my approach to wire mesh with board on board cladding. I couldn't find any real detail about this is trada publications or internet. Mesh is held behind the counterbattens or under a batten at the sill level, then folded over the first boards with a couple of staples to hold it in place. Where the mesh would show it's cut away and then the top board holds everything in place. Fairly quick, simple and relatively inexpensive for a roll of stainless mesh.