Impact French Doors for Florida

An impact French door is a hinged pair of glass doors built with laminated impact-resistant glass, tested as a full assembly to the Florida standards for flying debris. That’s the short version. It looks like a classic French door, but the glass and the way it’s anchored to the frame are engineered for Florida wind and debris, and for a cooling-dominated climate where solar heat gain is the thing to control.

The look is what people fall for first. A pair of doors that swings open and turns a wall into an opening onto the patio. Then the reading starts, hurricane glass, energy ratings, a stack of acronyms, and the thing that drew you in gets buried under jargon. So we’ll walk it the way we would at the kitchen table, with a neighbor staring at an old set of doors and wondering what to put in their place.

Quick answer: what makes a French door an impact French door

Two things separate it from an ordinary French door. The glass is laminated, so it holds together under impact instead of leaving a hole. And the whole door, glass, frame, and anchors, is tested and rated as one unit to Florida’s impact standards. Pair that with low-SHGC glass to keep the sun’s heat out, and a classic swinging door earns its place on a coastal Florida wall.

Key takeaways

• The rating lives in the whole assembly, not the glass alone. An impact French door is tested as one unit, glass and frame and anchors together, to ASTM E1886 and E1996, the standards behind Florida impact ratings.
• Laminated glass isn’t shatterproof. It can crack. What it won’t do is leave the opening: the interlayer holds the fragments together and resists penetration.
• Energy comes down to the glass, and SHGC leads. To qualify for ENERGY STAR in Florida’s Southern zone, a glass (more than half-lite) door must have a U-factor of 0.28 or lower and an SHGC of 0.23 or lower. U-factor still counts, it just doesn’t lead the way it would up north.
• Those common French door sizes are typical, never a rule. All Glass & Windows offers custom windows and doors, which matters most in older Sarasota homes where the rough openings never quite match a catalog number.
• We install impact French doors from PGT, WinDoor, Marvin (Ultimate and Elevate), Kolbe, and Signature.

What are French doors?

French doors are a pair of doors, hinged on the outside edges, that swing open from the middle. Each panel is mostly glass, framed with slim stiles and rails, and the two meet at a center where one panel usually latches to the other or to a fixed astragal. You’ll also see single French doors, one hinged panel, but the classic image is the pair swinging open onto a patio or garden.

That swing is the whole appeal. A French door opens the wall up in a way a sliding door doesn’t, and it gives you that symmetrical look on both sides. It also brings its own friction: a swinging door needs floor clearance, and it seals differently than a slider.

Made with laminated impact glass and anchored to Florida standards, that same classic door becomes an impact French door. The style doesn’t change. The glass and the engineering do.

How wide are French doors?

Common French door sizes are typical, not a rule. A single French door panel is usually 30, 32, or 36 inches wide, with a range of about 24 to 36 inches. A double (a pair) commonly totals 60, 64, or 72 inches across both panels, and 72 inches (two 36-inch panels) is the most common. Standard height is 80 inches, with 84-inch and 96-inch options for taller ceilings.

The sizes we see most often:

One more practical number. The rough opening (the framed hole in the wall) runs roughly 2 inches wider and about 2.5 inches taller than the door unit itself. That’s a rule of thumb, and it varies by manufacturer, so the real number comes off the manufacturer’s instructions for the exact unit.

Now the friction. A lot of older Sarasota homes have rough openings that don’t match any of these common sizes. Walls settle, additions get framed by eye, and previous doors get swapped in with shims and caulk covering the gaps. This is exactly why we measure the opening before we order anything, and why All Glass & Windows provides customers with custom sizes. If your opening is a half-inch off a catalog size, you don’t want to force a stock door into it. You want a door built for the hole you actually have.

What makes a French door impact-rated?

The word “impact” comes down to two things: the glass, and how the whole thing is tested.

Impact glass is laminated. Two plies of glass are bonded to an interlayer, typically PVB, so the panel behaves as a single piece. FEMA describes it plainly: ” Impact-resistant glass “is laminated with a thin film to keep the glass from shattering and is also sealed to its frame with structural adhesive, and FEMA calls laminated glass “the preferred glazing material for new construction.” On impact, the glass can still crack. What the interlayer does is hold the fragments together and resist penetration, which helps keep the opening intact against wind and debris. That’s why we never call it shatterproof. It’s laminated glass doing exactly what it’s designed to do.

The rating is based on testing the entire door as a system. Impact-rated doors are tested to ASTM E1886 (the test method, how the missile impact and cyclic pressure test is run) and ASTM E1996 (the specification, which sets the missile levels and pass or fail criteria). The large-missile level uses a nine-pound, two-by-four fired at the assembly, and after impact, the unit is subjected to cyclic wind-pressure loading to simulate a storm’s push and pull. The glass, frame, anchors, and installation all pass or fail together, which is why a good install matters as much as a good door.

That test standard traces back to the South Florida High-Velocity Hurricane Zone code, which covers Miami-Dade and Broward counties. Our Sarasota and St. Petersburg area isn’t in the HVHZ, but the same missile test underlies the impact ratings used across the state. In Florida, products are approved for use through the statewide Florida Product Approval (the pathway for our area) or, in the HVHZ, through a Miami-Dade Notice of Acceptance.

Buyers constantly mix up two ratings, so clear this one up early. Design Pressure (DP) rates the structural wind load a door is engineered to withstand, including the positive and negative pressure. Impact rating is a separate qualification for resisting flying debris. A door can carry both, and on a Florida coastal home, you generally want both. If your property sits in a wind-borne debris region, the Florida Building Code requires impact-resistant glazing or approved protection for the openings. Whether your specific address lands inside that region is an address-level question, so pull it for your lot before you shop.

For the broader “how do I pick a French door” questions, panel configuration, swing direction, hardware, and finishes, our exterior French door buying guide covers the general selection side.

Are French doors energy efficient?

They can be, and in Florida, the answer lives in the glass, not the swing. Two ratings tell you what you need to know.

SHGC (Solar Heat Gain Coefficient) is the fraction of solar radiation a door admits, measured on a scale of 0 to 1. The lower the SHGC, the less solar heat comes through. The U.S. Department of Energy puts it simply: “A product with a low SHGC rating is more effective at reducing cooling loads during the summer by blocking heat gain from the sun,” and “Low SHGCs reduce heat gain in warm climates.” That’s why we lead with SHGC here. Florida is cooling-dominated. You’re fighting heat coming in far more than heat leaking out, so SHGC is the number that matters most. For sun-facing exposures we point people toward an SHGC around 0.25 or lower.

U-factor is the second number. It’s the rate at which the door transmits non-solar, conductive heat flow, and lower is more efficient. It matters, it just doesn’t lead the way it would up north.

If you want a hard number to hold a door against, ENERGY STAR gives you one. To earn ENERGY STAR in Florida’s Southern zone, a glass French door (more than half-lite, meaning more than 900 square inches of glazing, which most glass French doors are) must be rated to a U-factor of 0.28 or lower and an SHGC of 0.23 or lower. Those are certification thresholds, not a promise about any one product. What they give you is a clean bar to measure against before you sign. Low-E glass coatings are how manufacturers reduce SHGC without making the glass dark.

That last row earns a note. A French door is hinged, so when you latch it the panels compress into the weatherstripping, and that compression is a real part of how a hinged door seals. As a rule, it does not make a French door tighter than a slider. Compare the air-leakage rating on the actual product, not the operating style in the abstract. If weather-tightness and head-to-head matter to you, our comparison of French doors versus sliding patio doors lays out the trade-offs side by side.

Where French doors get tricky in Florida homes

A few things come up on almost every impact French door job. Worth knowing before you order.

The opening is usually first. In older Sarasota and barrier-island homes it rarely matches a catalog size cleanly, which is the whole reason we measure before we order and build custom when the numbers call for it. We keep coming back to this because it’s the surprise that catches the most people.

Then there’s the width. A pair of French doors covers a wide opening, and wider openings see higher wind loads, which is where the DP rating earns its keep. A door engineered for the pressure at your exposure (west-facing and coastal lots especially) is not the same door as one picked off looks alone.

Last, the meeting point. Two panels come together in the middle, and the center seal and the astragal are where weathertightness is won or lost on a hinged pair. That’s a detail we check on the install. It isn’t something you can eyeball.

The brands we install for impact French doors

We install impact French doors from a handful of makers we trust for Florida work: PGT, WinDoor, Marvin (Ultimate and Elevate), Kolbe, and Signature. These are the brands we’d put on our own homes, and the right one depends on your opening, your exposure, and the look you’re after. For the deeper selection walkthrough, again, the exterior French door buying guide is the place to start.

If sliding is still on the table for you, or you’re weighing a wall of glass against a hinged pair, our guide to the best patio doors for Florida homes covers the sliding side, and the whole decision sits under our overview of exterior doors for Florida homes.

You can also read more on the protective side under our impact windows and doors solutions and on the ratings that drive comfort and cost under energy-efficient windows and doors.

French door questions Florida homeowners ask

Ready to choose the right patio door?

If you’re weighing impact French doors for a Sarasota, barrier-island, Lakewood Ranch, Bradenton, Osprey, or St. Petersburg home, we can help you match the door, the glass, and the rating to your opening and exposure. All Glass & Windows has sold, installed, and serviced impact windows and doors since 2009, and we build custom sizes for the openings in older homes.

For pricing, request a quote, and we’ll put real numbers to your project. If you’d like to see and handle a door before you decide, our showroom is available by appointment, Monday to Friday, 8:00 am to 4:30 pm. Reach out, and we’ll figure out the right next step together.