Settling jacks or screw jacks are used on homes that have extreme moisture content at the core of their wall logs that you will have to adjust when the bound cell water evaporates over time. You will need to adjust the height of all your vertical poles holding up the ridge beams, purlins and headers.
Settling jacks or screw jacks are 9”-11” steel pins that go between the floor and the bottom of the vertical poles and other places, as the wall logs shrink (Settle) down you have to continuously lower the ridge beams, purlins and headers or your roof will become detached from the top of the walls. If you do not keep on a routine maintenance schedule your warranty will become void.