When a plan set calls for 5/8 CDX Structural 1 roof sheathing Miami purchasing teams need more than a verbal “CDX” match. In the High-Velocity Hurricane Zone (HVHZ), the order must track the project documents, the panel stamp and the complete roof assembly. “Structural 1” is commonly written as Structural I or STRUC I on technical documents and stamps.

The current starting point is the Florida Building Code, 8th Edition (2023), which took effect December 31, 2023. Always check for current supplements, local requirements and the edition governing the permit. The code’s Chapter 23 wood provisions and Chapter 15 roof provisions are essential references, but the approved plans and authority having jurisdiction control the job.

What 5/8 CDX Structural I Actually Tells You

5/8-inch CDX Structural I roof sheathing is a plywood panel description, not a complete HVHZ installation specification. The thickness callout, veneer-grade shorthand, structural grade, span rating, bond classification and manufacturing standard are separate items. All must be read from the stamp and compared with the plans.

APA notes that “CDX” is commonly used in the trade for APA Rated Sheathing plywood with an Exposure 1 classification. It should not be treated as proof that a panel can remain permanently exposed to weather. The APA Rated Sheathing data sheet distinguishes temporary construction exposure from long-term weather exposure.

The APA grade-stamp guide shows the fields buyers should expect to review. APA also explains that PS 1-22 structural plywood covers species, veneer grading, adhesive bonds, panel construction, dimensions, marking and quality assurance.

Why Miami HVHZ Procurement Requires a Plan-First Check

An HVHZ roof is a system. Deck thickness and grade are only part of it. Framing spacing, panel orientation, edge support, roof geometry, design pressures, roof covering and underlayment can affect the approved design. That is why a purchasing manager should not substitute “same thickness” panels without written project approval.

Miami-Dade’s Product Control Section reviews building-envelope materials, products and systems, including roofing. Use the county’s Product Control Search to verify a current Notice of Acceptance (NOA) when an NOA applies. Do not assume that a plywood sheet has a stand-alone NOA, and do not assume that an approval for a roof covering resolves deck requirements. Check the approval’s scope, limitations, expiration status and installation requirements against the exact assembly.

How to Verify 5/8 CDX Structural 1 Roof Sheathing Miami Orders

1. Read the structural and roofing sheets. Confirm the required thickness or Performance Category, panel grade, span rating, bond classification, support spacing, edge support and orientation.
2. Match the physical stamp. Verify that the panel says Structural I when Structural I is specified. Record the standard, mill identification and other required markings. A supplier description is not a substitute for the stamp.
3. Verify approvals where applicable. Check current NOAs or other approvals for the roof system components named in the permit documents. Confirm that each approval applies to the proposed deck and assembly.
4. Use the project fastening schedule. Do not build from a generic blog chart. Fastener type, size, spacing, penetration, edge distances and corrosion protection must come from the current code, approved plans, applicable approval and authority having jurisdiction.
5. Resolve conflicts before delivery. Send discrepancies to the contractor, design professional and building official. Obtain written direction before ordering a substitute or releasing material to the jobsite.

Miami-Dade provides current roofing permit forms, checklists and standard details. For certain reroofing work, the county also states that roof sheathing attachment must comply with the Florida Building Code and that required documentation is presented for inspection. Project scope determines which forms and retrofit rules apply.

Why This Article Does Not Give a Universal Fastening Schedule

A single nail schedule would be convenient—and potentially wrong. HVHZ fastening can depend on project-specific design and the approved roof assembly. Publishing one spacing pattern as a blanket answer could conflict with sealed plans, current code language or an applicable NOA. The correct field direction comes from the contractor and design professional, subject to the building official’s acceptance.

International Plywood & Lumber can help the purchasing team identify the markings on a proposed panel and quote material that matches the written request. We do not replace the engineer of record, contractor or building department. Review our CDX plywood information and roofing plywood and lumber guide, then call to confirm the exact grade and current availability.

Frequently Asked Questions

Is any 5/8 CDX panel acceptable for a Miami HVHZ roof?

No. Thickness alone does not establish compliance. Match the plans, current Florida Building Code requirements, panel stamp, support conditions, applicable approvals and project fastening schedule.

Does Structural I mean the panel is Exterior-rated?

No. Structural I describes structural performance characteristics; Exposure 1 and Exterior describe bond durability. Verify both fields independently on the panel stamp.

Does roof sheathing itself need a Miami-Dade NOA?

Requirements depend on the product, component and roof assembly. Do not invent or assume an NOA. Search Miami-Dade Product Control and ask the design professional or building official whether a specific approval applies.

Can a supplier approve a substitution or fastening schedule?

No. A supplier can document available panel markings and quote the requested material. Substitutions and fastening must be approved through the contractor, design professional and authority having jurisdiction.

Call Before You Release the Purchase Order

International Plywood & Lumber has served South Florida’s trade community from Doral since 1983. Send the panel callout, required stamp information, quantity and delivery location. We will confirm what is available before you commit—without guessing at approvals, pricing or inventory.

For the fastest response, call (305) 884-0860, Monday through Friday, 7:30 AM to 4:00 PM. Hablamos Español. You can also request a wholesale volume quote or review options for a contractor trade account.

Important: Project-specific plans, current FBC requirements, product stamps, NOAs when applicable, and fastening schedules must be verified by the contractor, design professional and building official before purchase and installation.