Is 4ft the frost depth in your area? How deep is the groundwater at your site? Hes either worried about frost heave or water pressure lifting the footings, or he put the wrong...
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Cool, they must have lots of extra capacity with that steel in there. I wouldn't worry about voids too much in any area where you preasure grouted.
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If the titan bars don't take any load, why not just grout throu your regular drill pipe, remove after grouting, and reuse on each hole?
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