Nothing removed inside this time around. There was an earlier remodel on the large door opening. It originally had 2 hard to open sliders that were about 13ft wide maybe 11' something high. Took one structural post  out and opened up to a 13' high by 20' wide overhead door. Also at that time the concrete groove the doors slid in (and froze into in the winter) was removed. Poured a large block of concrete to support the floor joists and new door opening posts. Put in a engineered laminated beam spec'd by structural engineer. Over the years it seemed to sag down a few inches. This time there is almost a 1000# steel I beam laminated with lumber on all sides holding that roof area up where the old post was removed. With the laminated wood beam they had even put knee braces down on the sides of the door for extra support but that took too much height out of the sides of the door opening. Now it is full size opening height across the whole 20'

Old siding was wood ship lap that had lots of gaps and was in very bad condition. Did not want to put steel over that and did not want steel only. Sided with 3/4" tongue and groove OSB then housewrap then steel siding and on site formed steel roofing. I dislike anything that the wind can get behind and rip off. So that was the reason for the OSB underlayment so the steel was against solid sheeting on the entire thing. More money but it also adds lots of strength and makes for a very tight building which is what I was after compared to the ventilated ship lap wood siding where you could see cracks between every board.Did put in perforated vinyl soffet material to allow some breathing of the building though.

Re routed some of the spouting elements to avoid main roof downspouts laying on top of lean to roof. as well.

Was a big job and was not cheap but should easily not require any more work for a lot of years. I hope I made great grandpa proud of what he built back in about 1913 or 1914