Florida product approval, explained

Florida runs a statewide product evaluation and approval system for building products, established under section 553.842 of the Florida Statutes. Products that have been tested and documented against the code get listed in it and assigned an approval number, universally called an FL number. Windows sold for use in Florida carry one.

The point of a statewide system is that a product tested once can be used anywhere in the state without every local building department repeating the evaluation. When a window permit is applied for in Deltona, the FL number is how the city confirms what is going into the opening and what it was tested to do.

What the approval covers

Not just the glass, and not just the frame. The approval documents the assembly and the conditions under which it performs: the sizes it is approved in, the design pressures it holds, whether it is impact rated, and the installation methods that were tested. That last part is the one homeowners find surprising.

An approval is conditional on installing the product the way it was tested. That is why the manufacturer's installation instructions travel with the permit application alongside the approval number, and why the City of Deltona uses a Window and Door Inspection Affidavit on which the installer certifies that the work followed the manufacturer's specifications under the associated Florida Product Approvals.

The practical consequence: a correctly approved window fixed with the wrong anchors, at the wrong spacing, or into the wrong substrate has left its approval behind. On a concrete block wall the substrate question is a live one, which is why anchoring detail matters more here than it does in a stick-built house.

Where Miami-Dade fits

South Florida had a stringent product control system before the statewide one existed, and it still runs. A Notice of Acceptance, a Miami-Dade NOA, is that office's approval document.

Section 553.842 names the Miami-Dade County Building Code Compliance Office product control division as an approved product evaluation entity, which is why an NOA is accepted as valid product approval evidence across the state and not only in Miami-Dade. If a quote references an NOA rather than an FL number, that is normal and not a red flag. Both do the same job on a permit application.

NOAs carry a reputation for stringency because south Florida's high-velocity hurricane zone requirements are the toughest in the state. A product approved there is approved to a demanding standard. That does not automatically make it the right product for Deltona, where the requirement is different, but it is a reasonable thing to see on a quote.

What a homeowner does with it

Three things, none of them onerous.

Ask for it. A quote should be able to tell you what product is being installed and what approval it carries. A supplier who cannot answer that is not a supplier you want on a permitted job, because the number is needed at application time anyway.

Check that the approval covers your sizes and pressures. An approval lists the sizes and design pressures it applies to, and a product can be approved at one size and not another. This is normally the supplier's job, and it is worth a question on any unusually large opening.

Keep the paperwork. The approval documents, the permit number, the finaled inspection and the signed affidavit are the record that the openings are what you think they are. A wind mitigation inspection will want to see them, and so will a buyer's agent when the house is sold. Photograph the labels on the glass before they come off, because that information is not recoverable afterward.

The related numbers, and how to keep them straight

• FL number or NOA: what product this is and what it was approved to do. Goes on the permit.
• Design pressure: the wind load the assembly holds. Required on every Florida window regardless of location.
• Impact rating: whether the assembly passed missile impact and pressure cycling. Required only inside the wind-borne debris region.
• NFRC label: U-factor, solar heat gain coefficient and visible transmittance. Nothing to do with structure, everything to do with your power bill. The energy code guide covers it.

Those four answer different questions and get quoted together, which is most of why they get confused. A quote that separates them cleanly is usually a quote from someone who does this properly.

Details on the permit itself are in the Deltona permit guide, and a free measured quote is where the product conversation starts.