The ridge pole is the top horizontal log and rests on the king posts which are the vertical logs in the middle of the gable end.  The purlins are the two horizontal logs on either side of the ridge pole and are resting on the queen posts.

If you look closely, you can see small 2 by 4's that are in between the purlin and ridge pole on the gable end closest to the camera.  Bjorn used these as steps to push the ridge pole up by sliding it along the gable end with brute force.  That is why Dad calls him 'danger man'.  It may look like nothing but the log is very heavy and there is quite a drop-off with nothing to stop Bjorn from falling off.

It was a great relief to be finished this part!

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