We opted for solid lumber sheathing, right from design. It is a fairly vapour-open sheathing, due in large part to the gaps, which is what we wanted. It is also strong - allowing us to apply a wide variety of finishes, and place strapping anywhere we want. The lumber used was good one side 1x10 (22 x 235mm) pine/spruce, gotten for a really good price. It was actually 7/8" (22mm) thick.
|Note the concrete drip edge cast into the window opening.|