My apologies for jumping over from the EE forum with what may be a dumb question. We are designing a deep pile foundation in layered sandstone and my geotech engineer, who is very experienced in this area, says we could use piles as shallow as 10 feet into the competent rock. The city wants around 26 feet based on the h/3 setback rule and 65% grade. My guy says the rule was picked out of the air and is primarily intended for soils, not rock. If we are to challenge them, where would we go for analytical support?? Thanks Howie
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