Splicing House Logs
What is every-ones preferred method to make a 24' run with only 20' logs?
I have seen them done numerous ways.
Splicing top to bottom.
Side to side
Butting them up and using a bolt between them.
This is the way I did my butt joints, I would cut lay them out with the ends touching then run the chainsaw down between the ends so they were cut even and would butt tight. Then I would pull them apart and put some urethane foam insulation from the can on one end and butt them tight again. I then would run a log screw diagonally each way from end of on log to the other. At this point I would take a 1.5 in drill bit and run down into the butt joint through the logs into the one below a couple inches. Spray a little foam in the hole and drive a 1.5 inch dowel down the hole. I found this make a nice air tight joint as well as keeping the logs from moving and twisting.
Back in the day when I was on a crew building cabins in Fairbanks with three-sided logs, we just did a simple version of logman's method. The log will proportionally shrink the least along its length. As long as the joint doesn't need to be structural, a butt joint will work fine. If you need a structural joint, you can do an internet search for timber and scarf joint to see how many creative ways there are to meet your length requirement.