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Morris, IL | We seal ours up 4' down with concrete. It keeps birds out, easier to keep clean in winter, opens easier year round, it just really helps. We then attach the center "T" channel divider to the concrete. It never moves, no adjusting because ground is heaving or anything like that. I have a few pictures of forms and angle iron but for some reason i don't have a finished picture. Basically it's 16" wide in the trench (we have 16" backhoe bucket), might be 18-20" on the surface. The inside of building is about 9-10" (it matches the 2x10" door frame), then the rebar drops it down 2", then the outside part slops down and out pretty good. I can get a current picture if you want, email works.
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 DSC05927.jpg (262KB - 256 downloads)
DSC05926.JPG (90KB - 197 downloads)
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Frost-proofing a barn door - Morton sliding door
