Mk Neal wrote:We used red cedar for some arbors, and while the above- ground wood seems rot- resistant, the part in contact with soil rotted out in 5 years. We had filled the postholes with sand and crushed rock (paver base), but that was not enough to keep it from rotting. I found out that this is pretty standard life span.
Eliot Mason wrote:5 years seems really short. I've got split rail cedar posts that I think are about 50 years old ... they're not in great shape and just push over ... but they are there and upright. In Wisconsin I had a pair of gates posts in gravel for ~10 years with no rot.
Again, local conditions (water, temperature), installation style, and variation in the quality of the wood itself make historical comparisons difficult.