As you reach full height, a full width log will span across the side walls and over the top of the door opening. When settled into its correct position, it will ensure the side walls are aligned to their correct width and the front wall aligned vertically.
If you want to get the walls perfectly vertical, use a spirit level, best to be at least 4ft (1.2m) long and place it up against the logs. By using a soft faced mallet, you can tap each log to achieve the desired affect.
Author - Martin Corby
Posted - 08 Oct 2013