How to specify impact-rated windows for a Florida villa
A Florida impact specification is position-driven, not style-driven. Every opening below the 12 ft debris zone on an HVHZ elevation must carry a unit that passed the large-missile test on the Miami-Dade NOA / FBC path; everything else follows energy and schedule logic. State the wind zone, classify each position, and leave the glass build to the test report — the villa ships with the PGT documentation for the configured model.
Start from the wind zone, then the elevations
HVHZ is the dividing line: 130 mph and above is the band where the large-missile criterion governs the exposed elevations, and that is the band our coastal villas quote in. Inside the band, the missile target for each elevation is set by the code position — below the 12 ft debris line it is large missile (ASTM E1996); above it, and on secondary elevations where the code allows, the requirement drops to small missile or pressure-only. The drawing office classifies every position on the schedule and marks it, so the quotation matches the code line by line instead of over-rating the whole villa.
Position by position on a typical villa
- Ground-floor frontage, below the debris zone: large-missile casement or fixed-plus-vent (IR-80 CAS, IR-80 FIX) with the laminated core the test report confirms.
- Doors: the single impact door, Cat 5 configuration (IR-80 DOOR) — laminated tempered, with the matching multi-point schedule and the threshold the entry detail wants.
- Upper floors and rear elevations: small-missile or pressure logic on the same IR-80 platform, with the lighter glazing where the code allows — that is where the villa saves money without losing the listing.
- Terrace sliders: IR-80 SLIDE, two or three leaves — bearing and rail rated for the laminated weight, which is the line item that separates a real impact slider from a standard slider carrying a laminated lite.
What the document pack carries
The PGT test report for the configured model, the Miami-Dade NOA listing path, and — where the energy code reaches the position — NFRC registration for the U-factor and SHGC of the configured IGU. The lab test runs on the exact build that ships: pane, interlayer, cavity and frame, not a catalogue unit. That is why the configuration is locked before the lab step and the report is referenced in the shop-drawing package. Impact schedules quote at 40–55 days, and on a first model the lab sits in front of production, not behind it.
Where the argument usually breaks
- Quoting the whole villa as large missile — the upper floors and secondary elevations pay for glass they do not need.
- Leaving the door hardware at standard — the impact door is a different bearing and lock schedule, and it belongs on the drawing, not at the site.
- Specifying the missile target but not the wind speed class — the lab run needs both, and the price moves with the class.
Questions
No — the debris zone and the elevation decide. Positions the code places outside the large-missile criterion can carry the lighter schedule, and the drawing office marks each position on the list.