Illustrated cross-section comparing a pergola post on a 3.5 inch slab on grade with no footing, limited to 750 pounds per column, against a post on an individual footing extending at least 12 inches below undisturbed grade
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Slab, Footing or Pavers? Choosing a Base for a Pergola or Outdoor Kitchen

Pavers, a thin slab and individual footings are three different systems. Dublin’s 750-lb-per-column slab rule, the 12-inch footing minimum, and how two Bay Area cities differ on pergola and outdoor-kitchen permits.