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Void Forms under Grade Beams

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I have a soils engineer requiring me to design grade beams for a pier and grade beam residential foundation for an uplift of 1500 psf. He is also requiring void forms underneath the grade beams…. I thought this was an either or type of thing, not both. It’s a 1 story house and this will easily govern the design.

 

Any input appreciated.

 

-gm

SSF, CA