Written by Big Easy Windows
Key Takeaways
- In designated wind borne debris areas, glazed openings have to be protected, either by impact-rated glass or by an approved shutter or panel system.
- Whether your address falls in one of those areas depends on the design wind speed mapped for your location, so it’s determined parcel by parcel.
- Impact glass and approved shutters both satisfy the requirement. They differ in cost, convenience, and what happens when a storm arrives while you’re away.
- Product approval documentation is what an inspector checks, so keep it with your closing papers.
- Big Easy Windows installs impact-rated and standard windows across the metro. Free estimates at (504) 384-8165.
What the Requirement Actually Says
Quick Answer: Louisiana’s residential building code adopts wind borne debris provisions that apply in higher wind speed regions along and near the coast. Where they apply, every glazed opening in the building envelope, meaning windows, glazed doors, and skylights, must either use impact-rated products or be covered by an approved protective system. It’s not a recommendation or an insurance preference. In a covered area it’s a condition of passing inspection.
The confusion comes from the fact that coverage isn’t uniform. A home in New Orleans and one in Hammond sit under different design wind speeds, and the requirement follows the map, not the parish line. Your address determines your answer.
Why Openings Get Singled Out
The logic is about pressurization, not just broken glass. When a window fails during high wind, air enters the building and pressure builds inside faster than it can escape. That internal pressure pushes outward on the roof and walls at the same moment the wind is pulling on them from outside. Losing one window can turn into losing a roof.
Keeping the envelope closed is the whole point. That’s why the code treats openings as a system and why protection has to cover all of them rather than the front elevation only.
Two Compliant Paths
Impact-Rated Windows
Impact-resistant windows use laminated glass, an interlayer bonded between glass plies, in a frame engineered to hold the assembly together after the glass is struck. The glass may crack, and it stays in the opening.
What you get: protection that’s always active, no deployment, no storage, and no scramble as a storm approaches. Secondary benefits include sound reduction and UV filtering. What it costs: more per opening than standard windows, and the decision is effectively permanent once installed. Our post on whether hurricane impact windows are worth it works through the tradeoff.
Approved Shutters and Panels
Tested shutter systems, from steel and aluminum panels to accordion, roll-down, and code-compliant plywood details, also satisfy the requirement when they carry the right approval for the opening they cover.
Lower up-front cost is the appeal. The catch is that they only work when deployed, which means being home, having time, and having somewhere to store panels. We compare the two approaches in impact windows vs hurricane shutters.
Ratings You Will See on a Quote
A few terms show up repeatedly, and they aren’t interchangeable:
- Design pressure. The structural load a unit is rated to handle. Larger openings generally need higher ratings.
- Missile level. Impact testing tiers, which reference large and small missile criteria depending on the opening’s height above grade.
- Product approval. Documentation that a specific product passed testing for a specific application. This is the paperwork an inspector wants.
Ask for the approval documents on the actual product being installed, not the manufacturer’s catalog generally. Ratings vary by size and configuration within a single product line.
Where This Bites in the Metro
Two practical situations come up constantly:
Partial replacement. Replacing a few windows in a covered area still means those units need to comply. You don’t get grandfathered for the new work.
Permits. Window replacement generally requires a permit in this area, and that’s where compliance is checked. Our guide to window replacement permits in Orleans and Jefferson Parish covers the process. Skipping the permit doesn’t remove the requirement, it just defers the problem to your next sale or claim.
What It Means for Your Budget
Impact-rated units cost more than standard ones, and the gap widens on large openings. That said, the comparison isn’t impact glass versus nothing. In a covered area it’s impact glass versus a shutter system that also has to be bought, installed, stored, and deployed. Run both numbers. Our breakdown of hurricane impact window cost in New Orleans covers the ranges, and window replacement cost across the metro puts it beside standard work.
Frequently Asked Questions
How do I know if my address is in a wind borne debris area?
It’s tied to the design wind speed mapped for your location and confirmed by your local permitting office. Ask them directly rather than assuming based on distance from water.
Do I have to protect every window?
Where the requirement applies it covers glazed openings in the building envelope, not a selected few. Partial protection defeats the pressurization logic behind the rule.
Are impact windows the same as hurricane windows?
People use the terms interchangeably. What matters is the tested rating and approval documentation for the specific unit, not the marketing name.
Will impact windows lower my insurance?
They can affect what a carrier charges, with conditions. See our post on the benefits of impact resistant windows, and talk to your agent about documentation before assuming a discount.
Can I use plywood instead?
Code-compliant panel details exist, with specific requirements for thickness, fastening, and spans. Improvised plywood over a window is not the same thing as an approved system.
Get an Answer for Your Address
We’ll confirm what applies at your property, quote impact-rated and standard options where you have a choice, and hand over the product approval documentation with the job.
Big Easy Windows installs across the metro and Northshore, including Metairie, Kenner, and Slidell. See the full service area or call (504) 384-8165.
