I am designing a grade beam on helical pier foundations to carry a 2 storey residential building on a site with 15' +/- of fill. I have designed concrete beams for lintels & suspended floors before and am looking at a similar design for strength to carry my loads but 2 pier contractors I have talked to say my spacing is longer than they usually see. I am 14'-16' in different areas but one guy says average 8' & the other says 10'-12'. I want to keep the grade beam only about 3' deep & I also want to minimize the number of piers. Do you see any problems?
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