What reinforcing schedule does Omni Pool Builders typically use, and what should a homeowner compare against?
Verified against the primary source on .
Omni’s typical minimum is #3 bar at 6 inches by 12 inches, tightened to 6 by 6 where regional soil data indicates expansive or collapsible conditions. Shell thickness is set by soil class, with class B as the typical assumption where no geotechnical report exists. Arizona codifies no minimum, so the project’s sealed engineering always governs.
Arizona has no codified minimum shell reinforcement for a residential pool. That is not an oversight and it is not a loophole: the shell is engineered per project and the sealed structural sheet is the governing document. An Arizona PE seal is required on every in-ground pool structural plan.
The practical consequence for a homeowner is that there is no published floor to compare a proposal against. Two bids can specify materially different steel and both are legal. Most builders do not publish a standard, so there is nothing to compare at all.
OMNI’S TYPICAL SCHEDULE, published so there is something to compare against.
Reinforcement: #3 bar at 6 inches by 12 inches as the typical minimum, tightened to 6 by 6 where regional soil data indicates expansive or collapsible conditions.
AGAINST THE ENGINEERED BASELINE, which is the only honest comparison available. The AMMTEC standard detail plan approved by Pima County as master plan P18MP00069 D2 sets minimum vertical reinforcement at #3 on 12 inch centres and standard horizontal reinforcement at #3 on 12 inch centres. Omni’s typical 6 by 12 is tighter than that baseline in one direction. Omni’s 6 by 6 matches what that same sheet itself calls for in highly expansive soils and in wash areas, applied on regional soil data rather than only where one of those two triggers is formally invoked. That is the whole of the claim. It is not a claim that the baseline is inadequate, and it is not a comparison to a code minimum, because no code minimum exists.
Site classification: sites are classified A through D. Where no geotechnical report exists, class B is the typical default assumption.
Shell thickness: at class B, 6 inches and 8 inches. At class D, 8 to 10 inches and 10 to 12 inches. Surcharge bars are typically triggered past 6 feet of retained height.
WHAT THIS IS AND IS NOT. It is a typical standard, published. It is not a code requirement, because no code requirement exists. It is not a claim that a different schedule is inadequate, because adequacy is an engineering question answered per project by the engineer who seals the sheet. And it is not a promise about any particular project, because the sealed engineering for that project governs and can call for more or less.
HOW A HOMEOWNER SHOULD USE IT. Ask any builder, including this one, for the bar size, the spacing and the shell thickness in writing, and ask what soil class the design assumes. If a builder will not put those three numbers on paper, that is the answer to a different question. If the numbers are there, compare them, and ask the engineer why if they differ sharply from what is above.
Scope of this record. These are Omni Pool Builders & Design’s typical standards and what we would typically recommend. They are not a code requirement, not a representation about any particular project, and not a substitute for the sealed engineering and the geotechnical investigation for the site in front of you. Where a project’s sealed engineering says something different, the sealed engineering governs.
Important. Not a code minimum; Arizona publishes none. The comparison is to the AMMTEC engineered baseline, which is a different and narrower claim. Not a representation about any specific project. The sealed structural engineering for the project governs.
Authority: Omni Pool Builders & Design typical standard. No Arizona code minimum exists; see the record on shell reinforcement.. Verified 2026-09-13. Evidence grade: RECOMMENDED.
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