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nw NC | When was it built? Last used? Have cattle now? How would you handle silage for delivery into a feeding facility?
I suggest that you contact a silo building/repair service company in the Ohio/Indiana/Michigan area to come look at your silo and get a professional's opinion of the integrity of the silo. Google search "Silo repair service in Ohio , Indiana Michigan".
This farm in Michigan https://www.youtube.com/watch?v=lf52SB2Lwm8 just tore down a 20 foot diameter silo ( good roof available for sale) to make access to freestall barn for feeding with tractor and TMR mixer . They quit using all silos (said they are worn out) and now fill bags. Perhaps you could find out the company that took down the silo and get them to check yours out and possibly install a roof and unloader for you.
Here is site with silage bag, pile and walled bunker capacity charts. https://www.pioneer.com/us/agronomy/silagecapacities.html Use it to figure amount of storage compared to upright silo capacity chart ( in photo below) for 20 feet diameter silos. That chart shows 68% moisture silage. I estimate that you should get about 550 tons 63% moisture silage in 75 feet of settled silage in 80 foot silo.
With site prep, ready mix and pouring labor, costs for a walled bunker, a pad for pile, or narrow long strips for bags is going to be expensive. Use these figures for calculating concrete needs for area covered per cubic yard.
4 inches thick covers 81 sq. feet/cu. yard
5 inches thick covers 64.5 sq.feet/cu. yard
6 inches thick covers 54 sq. feet/cu. yard
I still use a 20 X 50 stave silo built in 1973. It was shotcrete relined 25 years ago, still in good condition. I intend to use it for a few years yet until I cease keeping cattle. I had a whole lot rather use a silo than deal with buying plastic covers or bags each year and having to dispose of the stuff plus handling tires and dealing with damage to plastic by varmint animals and spoiled feed under damaged plastic. Not to mention muddy areas if silage is not on concrete.
 (Capture.JPG silo chart 2 (full).JPG)
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 Capture.JPG silo chart 2 (full).JPG (134KB - 3 downloads)
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Silo repair
