We have not been able to determine the age of the barn, the neighbor thinks its related to their house that is 100 years old.

Well this is not the original roof, but it has been on here for a LONG time. Lots of broken and missing shingles, etc.

The original plan was to just install 2 x 4 purlins over top of the existing shingles and then screw the new steel roof to that. WELL..

Once I took the ridge cap off and cut back the shingles and sheathing for the ridge vent, the plans changed.