The south and east walls were weather-boarded. This is cheaper and quicker to fit as a wall covering than shingles. Sawn boarding works well as a vertical wall with eves but is not a durable option for roofing. However a case could be argued for it as being at least as good as sawn cedar shingle roofs. See the post on shingles. We have used western red cedar boards, which have an amount of natural durability but less than oak. It is overlapped heartwood-to-heartwood and attached with stainless steel nails. I used to attach them with the nails hidden but now attach with the nails just showing below the next board. There is much discussion about which is the best technique. With nails showing the boards are held in two places reducing cupping (bending of boards as they season). Additionally if the boards ever have to be removed it’s a lot easier.