I live in Northern Michigan. I’ve had full natural sized logs that had surface rot repaired by attaching 1/2 logs to them. The problem is that those half natural various sized logs only get about 4 years before they rot. What type of log should be used? The problem is the lower logs where the snow lays on them for months. I prefer the 1/2 log method being it’s easier than a full log replacement but if I have to do this so often, it may not be the best way. The inner half of the logs are solid.