For the snow load you picture I doubt it's in much immediate danger... but if that snow got water laden or you got a good strong wind... all bets are off. I think what concerns me most about that barn is the general lack of proper bracing. A rafter can carry a lot of load in that configueration IF that post/purlin system doesn't start to twist and sway... but there isn't a lot there to prevent that. As a comparison here... a building that size would have a full 'W' truss with probably 2x8 or 2x10 top and bottom chords, spaced on a minimum of 4' centers, 2x10 or 2x12 wall plates and 2x4 strapping on the roof and walls at 16" and 2' respectively. IN addition there would be two knee braces on every truss and several runs of 2x4 above the bottom chords of the truss, end to end... as well as more diagonal corner bracing on the top chords towards the end of the building. This is clear span I'm talking about... but still probably 3 times the material. I'd also be concerned about the stains on some rafters. Leaks above there? Rotten wood? Nails?
As someone else suggested, it might be a good time to remove the valuables...
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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