Thanks, I'll look at the wraps. I plan to pour the concrete in the hole up to ground level and a bit above, so I think that will prevent most of the contact from the soil, but the wraps might be a good idea. The bark will fall off eventually. I could treat it again if necessary down the road...
I'm building a fence out of spruce and larch boards that still have the bark on one side, and the fence posts will be oak (10 cm x 10 cm). See the photos (raw spruce and larch boards, and an example of a completed fence made with them). The oak posts will be set in cement, and the larch/spruce...