Reading an NOA Against a 62-Foot Roof in the HVHZ

No. The approval does not cover the building as designed. Mismatches:

1. Height. Mean roof height is 62 ft; the approval caps at 60 ft. Two feet is not a rounding error - the approval's attachment patterns were tested at a maximum height and pressure, and at 62 ft the demand is higher. You need either a current NOA that covers at least 62 ft at Exposure C and 195 mph, or a signed and sealed evaluation from a Florida professional engineer specifically for this building. Do not proceed on the existing NOA and hope the inspector does not measure.
2. Deck. The approval names structural concrete and steel decks. Confirm the exact profile and gauge of the 1.5 in. composite deck and that the approval's fastener pull-out values were tested on that deck. A composite deck with concrete fill is not the same substrate as bare steel deck.
3. Expiration. 06/12/2026. The approval must be current at permit issuance and at final inspection. If it expires mid-project, you need the successor approval and a permit revision. Verify the number against the current Miami-Dade product-control list; NOA numbers get superseded.
4. Edge metal. 'Standard edge metal, field fabricated' is not approvable in the HVHZ. Edge flashings must be a tested and approved assembly with an NOA, meeting ANSI/SPRI ES-1. Field-fabricated edge metal has no tested uplift resistance at 195 mph and no approval number for the inspector to check.
5. Fastener pattern. The plan's 12 in. field pattern came from somewhere else. The governing pattern is the one in the approval that matches your actual height and zones - and at 62 ft it may need to be tighter than 6 in. in the perimeter zone, which will not be in this NOA at all.

Action: RFI to the architect before ordering, requesting direction on height compliance and edge metal. Get the substitute approval or sealed design. The membrane cost does not change; the attachment pattern and edge metal do.

Edge metal, for the life of the roof. In the HVHZ, perimeter edge metal must be an approved, tested assembly with an NOA and must meet ANSI/SPRI ES-1. It has to be installed with the specified cleat, fastener, spacing, and edge-zone dimension from the approval. Field-fabricated coping or drip edge is the single most common source of perimeter blow-off losses, and it will fail inspection. The edge and corner zones also see the highest uplift pressures in the field of the roof - the approval's zone dimensions (typically 10% of the least plan dimension, minimum 3 ft) govern the membrane attachment too, so the perimeter and corner fastening pattern must be laid out from the plan dimensions, not eyeballed.

Fall protection during construction. For construction work, OSHA requires a guardrail system with a top rail at 39–45 in. and capable of withstanding the required load. A 42 in. parapet may serve that function only if it is structurally adequate and scupper and overflow openings are addressed - but the moment your crew removes coping and edge metal to install the new flashing, the guard is gone along the entire length of the wall they are working from. Temporary cable or clamp-on guardrail must be planned and priced.

Second-order issue: if tapered insulation builds the roof surface up 10–12 in. at the high point, the effective parapet height above the finished roof drops. That changes both the guard height and the required height of the edge metal and counterflashing. Raise it with the architect now, not after the insulation is down.

Slope and buildup. 1/4 in. per foot is a 2% slope, which is the common code and membrane-manufacturer minimum for positive drainage - it is acceptable, but it is the minimum, and if the structural deck is flat, every inch of that slope comes from tapered insulation.

• Over a 50 ft run to a drain: 50 × 0.25 = 12.5 in. of build-up at the high point
• Average thickness across the roof is roughly half: about 6.25 in.
• Taper quantity: 6,000 sq ft × 6.25 in. / 12 = approximately 3,125 board feet
• At $2.10/bf that is roughly $6,560 of taper that a flat-deck assumption would have missed entirely.

That buildup raises the finished roof surface 10–12 in. at the high points, which changes door thresholds, RTU curb heights (and the code-required clearance for the units), the effective parapet height, and roof drain leader elevations. All of it must be resolved on paper.

Drainage capacity. Four drains on 6,000 sq ft is 1,500 sq ft per drain, but check the drain and leader sizing against the design rainfall intensity and confirm the manufacturer's minimum slope. A 1/4 in. per foot roof with undersized leaders ponds, and ponding is the leading cause of membrane failure and a warranty denial.

Fastener conflict. The specification says 12 in. field rows; the approval for your height may require tighter. The more restrictive governs, and the approval controls the inspection. Submit the RFI, request written direction and a change order for the denser pattern, and do not install to the plan detail. Getting the attachment wrong means failing inspection and owning the uplift risk for the life of the roof; the cost delta is a few thousand dollars.