Hurricane Protection
Built to Survive What Florida Throws At It
Impact windows aren't just glass — they're an engineered system designed to stay intact through Category 5 winds, flying debris, and the relentless pressure cycles of a major hurricane. Here's exactly how they work, what the certifications mean, and why they outperform shutters in every meaningful way.
The Science of Impact Glass
What Actually Happens During a Hurricane
A hurricane doesn't just blow hard — it creates a sustained, violent cycle of positive and negative pressure that tries to pry your home apart from every direction simultaneously. Standard windows fail not just from direct impact, but from the pressure differential that builds once the envelope is breached. Impact windows are engineered to survive all three threats.
Flying Debris
The most immediate threat. At 130 mph winds, a 2×4 lumber board becomes a 9-pound missile traveling at highway speed. Standard glass shatters on contact. Impact glass — two panes of tempered or heat-strengthened glass bonded to a PVB or SGP interlayer — absorbs the impact and holds together even when cracked, like a car windshield.
Wind Pressure Cycles
As a hurricane passes, wind direction reverses repeatedly. Each reversal creates a pressure spike — first pushing in, then pulling out — that can exceed 200 pounds per square foot on a large window. Impact frames are engineered with reinforced corners, heavy-duty hardware, and deep frame embedment to resist these cyclic loads without racking or pulling free.
Pressure Breach
If any opening in your home's envelope fails — a window, door, or garage door — the interior pressurizes instantly. That pressure spike can lift your roof off its trusses from the inside. Impact windows that stay intact prevent the breach entirely, keeping your home's envelope sealed and your roof where it belongs.
How Impact Glass Is Built
Two Panes. One Interlayer. The Difference Between Intact and Destroyed.
Every impact window starts with the glass unit itself. Two panes of tempered or heat-strengthened glass are permanently bonded to a polymer interlayer — either PVB (polyvinyl butyral) or the stronger SGP (SentryGlas Plus). When the outer pane cracks under impact, the interlayer holds every fragment in place. The window stays in the frame. Your home stays sealed.
Outer Pane
Tempered or heat-strengthened glass — 4× stronger than standard annealed glass
PVB or SGP Interlayer
Polymer membrane that holds glass fragments together on impact — the critical safety layer
Inner Pane
Second tempered pane — provides structural backup and, in IG units, the air/gas cavity for energy performance
Impact Frame
Reinforced aluminum or vinyl frame with heavy-duty hardware engineered to resist cyclic wind loads
Miami-Dade NOA
The Toughest Window Certification in the Country
Miami-Dade County's Notice of Acceptance (NOA) is widely regarded as the most rigorous impact window certification in the United States. It was created after Hurricane Andrew in 1992 exposed catastrophic failures in standard construction — and it set a new benchmark that the rest of Florida eventually adopted into the Florida Building Code.
To earn a Miami-Dade NOA, a window system must pass a battery of tests administered by an independent, accredited testing laboratory — not the manufacturer. The tests simulate the worst-case conditions a South Florida home might face: large missile impact, small missile impact, cyclic wind pressure, water infiltration, and structural load. Every component of the system — glass, frame, hardware, and installation method — is tested together as a unit.
Large missile test
A 9-lb 2×4 fired at 50 ft/sec must not penetrate the glass unit
Small missile test
10 steel balls fired at 80 ft/sec must not penetrate
Cyclic pressure test
4,500 pressure cycles simulating sustained hurricane winds — the window must not rack, deflect excessively, or fail
Water infiltration test
Sustained wind-driven rain must not penetrate the frame or glazing system
Structural load test
Static pressure loads exceeding design wind speed must not cause failure
All Phase installs only products with current Miami-Dade NOA approval. We provide the full NOA documentation package for every project — required for your building permit, your HOA approval, and your insurance wind mitigation inspection.
Impact Windows vs. Hurricane Shutters
Why More Homeowners Are Choosing Permanent Protection
Hurricane shutters were the standard for decades. They work — but they come with real costs and limitations that impact windows eliminate entirely. Here's an honest comparison.
Insurance Savings
Miami-Dade NOA Windows Can Cut Your Wind Premium by Up to 45%
Florida homeowners pay some of the highest wind insurance premiums in the country. The Florida Office of Insurance Regulation requires insurers to offer discounts for homes with verified opening protection — and Miami-Dade NOA approved impact windows qualify for the maximum opening protection credit.
After installation, you'll schedule a wind mitigation inspection with a licensed inspector. The inspector documents your opening protection using the OIR-B1-1802 form. Your insurance company applies the discount — typically 20–45% off the wind portion of your premium — which can translate to hundreds or even thousands of dollars per year depending on your coverage.
Installation complete
All Phase provides the full NOA documentation package at project completion
Wind mitigation inspection
A licensed inspector documents your opening protection on the OIR-B1-1802 form — typically $75–$150
Submit to insurer
Provide the completed form to your insurance agent — discounts apply at next renewal or immediately
Annual savings
Most Palm Beach County homeowners see 20–45% reduction in their wind coverage premium
Actual discount varies by insurer, coverage amount, and home construction. All Phase does not provide insurance advice — consult your agent for a specific quote.
Florida Building Code & Impact-Rated: What the Terms Actually Mean
The Florida Building Code (FBC) requires all new windows and replacement windows in High-Velocity Hurricane Zones (HVHZ) — which includes all of South Florida — to meet impact resistance standards. 'Impact-rated' means the product has been tested and certified to meet those standards. Miami-Dade NOA approval satisfies and exceeds the FBC requirement for HVHZ installations.
HVHZ
High-Velocity Hurricane Zone — the designation for Miami-Dade and Broward counties under the Florida Building Code, requiring the highest level of impact resistance for all fenestration products
Miami-Dade NOA
Notice of Acceptance — Miami-Dade County's product approval, widely regarded as the most rigorous impact window certification in the U.S. Required for HVHZ installations; accepted statewide
Florida Product Approval (FPA)
The statewide product approval system. Products with Miami-Dade NOA automatically qualify. Required for all replacement windows in Florida
Design Pressure (DP) Rating
The maximum wind load (in pounds per square foot) a window is rated to withstand. Higher DP ratings = stronger windows. Your permit specifies the minimum DP rating required for your home's location and exposure
Get Permanent Hurricane Protection — and Start Saving on Insurance
Schedule a free in-home consultation. We'll assess your home's openings, recommend the right products for your wind zone, and give you a clear written quote with full NOA documentation included.