Impact vs. Non-Impact Windows: What Florida Homeowners Should Know
If you are building or renovating in Florida, one of the first questions about new windows is whether they need to be impact windows. The short answer depends on where the house is, and the longer answer affects your budget, your insurance and how you prepare for storm season. Here is a plain overview from our side of the business.
What makes a window "impact"?
The difference is mostly in the glass. An impact window uses laminated glass: two or more lites bonded to a tough plastic interlayer. When debris hits it, the glass can crack, but the interlayer holds the pieces together and the opening stays closed. The frame, anchors and hardware are tested as one system, because a strong pane in a weak frame doesn't help much.
A non-impact window uses standard insulated glass. It can be very well made and very energy efficient, but if a flying branch or roof tile goes through it during a hurricane, wind and rain get into the house and pressure builds up inside.
How impact windows are tested
In Florida you will hear a few test names over and over:
TAS 201: the large missile impact test. A piece of lumber is fired at the window to simulate wind-borne debris.
TAS 202: uniform static air pressure, which checks how the window holds up under steady wind load.
TAS 203: cyclic wind pressure, thousands of pressure cycles that imitate the push and pull of a storm after impact.
These protocols come from Miami-Dade County and are widely seen as the toughest in the country. Products that pass them can be used in the High Velocity Hurricane Zone, which covers Miami-Dade and Broward counties. The rest of the state also relies on Florida Product Approval and on design pressure ratings, so always check the paperwork, not just the label "hurricane window".
Do you need impact windows?
Under the Florida Building Code, glazed openings in wind-borne debris regions must be protected. You have two options:
Impact-rated windows and doors.
Non-impact windows plus approved shutters or storm panels.
Wind-borne debris regions cover much of coastal Florida, but the exact boundary depends on your county and the design wind speed for your site. Your architect, contractor or local building department can confirm what applies to your address. Inland homes outside these regions can often use non-impact windows without shutters.
Impact windows: pros and cons
What you gain:
No shutters to install and take down every time a storm is forecast.
Protection around the clock, even when nobody is home.
Laminated glass blocks most UV light and cuts outside noise noticeably.
Better security, since laminated glass is hard to break through.
In many cases, a lower windstorm insurance premium after a wind mitigation inspection. Ask your insurer.
What to keep in mind:
They cost more than non-impact windows.
The glass is heavier, so sash sizes and hardware have limits.
Design pressure still matters. An impact window rated too low for your site will not pass inspection.
When non-impact windows make sense
Non-impact windows are not the wrong choice by default. They work well inland, on porches and screened areas that are already protected, and on homes where the owner prefers permanent shutters. They are also lighter and usually cheaper, which leaves more room in the budget for better thermal performance.
Where tilt and turn windows fit in
European tilt and turn windows open inward and close with locking points all around the sash, pressing it against continuous gaskets. That design is naturally good at keeping wind-driven rain out, and there is no sliding track for water to collect in.
Our windows now carry TAS certification for the Florida market. Testing covers specific product lines, sizes and glass build-ups, so the right choice depends on your project. Tell us where you are building and the design pressure from your plans, and we will match it to a tested configuration. You can review our published test reports and the full range of glass options in the meantime.
Talk to us about your Florida project
We work with homeowners, builders and architects across Florida. Call us at (321) 765-3355 or send us your project, and we will get back to you with a quote within 48 hours. If you are new to European windows, start with our guide on how tilt and turn windows work.
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