For a log cabin which many possibly be used to house family members when they come to visit during the holiday seasons it is best to get a cabin with a minimum of 70 mm and up to 95 mm anything le and you would need to install internal insulation because the thicker the log the more insulating properties it has.
The windows and doors in your log cabin are also very important point and it would be best if they were double glazed. Some of the windows installed must be able to open to allow for ventilation during the summer months, Some of the better log cabins offer tilt and turn Windows which enable you to control the ventilation to a greater extent.
Log Cabins 