Hurricane and Impact-Resistant Windows: A Complete Guide

An impact-resistant window looks like an ordinary window, but its glass is engineered to survive a direct strike without falling apart. The defining feature is laminated glass: two panes of glass permanently bonded to a clear, flexible plastic layer in between. When something hits hard enough to crack the glass, the broken pieces stick to that inner layer instead of flying into the room.

That single change rewrites how the window behaves in a storm. A failed window is not just broken glass; it is an open hole that lets wind pressurize the house and push the roof from the inside. Because laminated glass stays in its frame even when shattered, it keeps that opening sealed against wind and water. Hurricane windows and impact windows are the same thing, named for the testing they pass rather than any special coating you can see.

The strength of an impact window comes from a sandwich most people never notice. Two glass plies surround an interlayer, usually polyvinyl butyral (PVB) or a stiffer ionoplast resin, and the whole stack is fused under heat and pressure. The thicker and tougher that interlayer is, the more force the unit can take before the glass lets go, which is why two impact windows that look identical can perform very differently.

Glass is only half the system. The frame is reinforced, and the window is anchored directly into the structural framing of the wall, not just tacked to the trim. That anchoring matters as much as the glass, because a storm tries to tear the entire unit out of the opening, not only break the pane. When the glass cracks but holds and the frame stays put, the building keeps its envelope intact and avoids the pressure spike that does the worst structural damage.

This is also why impact resistance cannot be added to a window you already own. The rating describes the glass, the frame, the hardware, and the install working together as one tested assembly. Slipping a sheet of laminated glass behind an old frame does not make the window impact-rated.

It helps to see where impact glass sits among the alternatives, because the names get blurred in marketing. Standard annealed glass breaks into large, sharp shards. Tempered glass is heat-treated to be stronger, and when it does break it crumbles into small blunt pebbles, which is safer for cuts but useless in a storm because the opening is left wide open. Laminated impact glass is the only type that breaks and stays in place.

Storm windows and storm shutters are a different category again. A storm window is a secondary pane added over an existing window, mainly for energy savings, and it offers little debris protection. Shutters do protect the opening, but you have to deploy them before every storm, and they block the view and light while they are up.

Impact windows fold all of that into one permanent unit. There is nothing to close when a warning is issued, the glass works around the clock, and you keep your daylight and your view. For homeowners who would never get a shutter closed in time before an Ohio thunderstorm rolls through, that always-on quality is the practical difference.

Impact windows earn their name in a lab, and a few standards tell you whether a product is the real thing. The core tests come from ASTM E1996 and E1886. In the large-missile test, a cannon fires a nine-pound piece of two-by-four lumber at the glass at around fifty feet per second, roughly thirty-four miles per hour, aimed first at the center and then at a corner. The window has to survive both hits and then endure thousands of pressure cycles that mimic a storm pushing and pulling on the glass for hours.

The number you will see quoted most is the design pressure, or DP, rating. It measures how much wind load the unit can carry before it fails, and higher is stronger. As a rough guide, every ten points of DP corresponds to about one hurricane category of wind, so a DP 50 window is built to take far more than a typical Ohio gust will ever deliver.

In coastal states, products also carry approvals like a Miami-Dade Notice of Acceptance, the strictest benchmark in the country. You do not need that exact stamp in Ohio, but it is a useful signal: a window certified for a high-velocity hurricane zone has been pushed harder than anything our weather asks of it.

Ohio does not get hurricanes, so it is fair to ask why a hurricane window belongs here at all. The answer is that the threat impact glass was designed to stop is flying debris under high wind, and Ohio produces plenty of that. Severe thunderstorms, straight-line winds and derechos, spring hail, and the tornadoes that touch down across the state every year all send branches, gravel, and loose siding at houses with real force.

The 2012 derecho that swept through the region is a good reminder. Winds well over seventy miles per hour snapped trees and threw debris through windows across central Ohio, and a cracked or blown-out window during a storm quickly becomes water damage and a pressurized attic. Laminated glass is built for exactly that moment.

After a rough storm season around Columbus, most of the window calls we get are cracked panes and broken seals from flying branches and hail. Laminated glass is the one product that can take a hard hit and still stay in the opening, holding back wind and rain even when the pane is spider-webbed, until we can come replace it.

For most Ohio homes the storm protection is a strong bonus rather than the only reason to buy. The day-to-day advantages, covered next, are what make impact glass worth considering even in a year when no big storm arrives.

The same construction that stops a piece of lumber does useful work on an ordinary Tuesday. Because the glass holds together when struck, it is far harder to break through, so a would-be intruder cannot simply punch out a pane and reach the latch. Police and insurers treat laminated glass as a genuine security upgrade, not a gimmick, and it buys the seconds that often send a burglar looking for an easier house.

Noise is the benefit people notice first. The plastic interlayer damps sound vibration, so traffic from a busy road, aircraft overhead, and barking dogs all arrive muffled. That same layer blocks the bulk of the ultraviolet light that fades floors, rugs, and furniture over the years.

Energy performance depends on the rest of the glass package, not the lamination itself. Pair the impact unit with a Low-E coating and an argon-filled insulated glass unit and you get a window that handles Ohio’s cold snaps and humid summers as well as it handles a storm. If a non-impact window in the house ever takes a hit, a glass repair can sometimes save the unit, though laminated glass rarely needs that call in the first place. Some insurers offer a windstorm or hail discount for impact-rated glass, but you should confirm the details with your own carrier before counting on it.

Impact resistance is not limited to one shape of window. Manufacturers build the laminated glass into the same styles you already know, so you can match the look of the house instead of settling for a bunker. The frame material still matters, because it carries the load and seals the opening through Ohio’s freeze-thaw swings.

Vinyl is the most common and budget-friendly frame, fiberglass offers the lowest thermal movement and holds its shape in temperature extremes, aluminum is strong but conducts cold unless it has a thermal break, and wood or clad-wood suits historic homes for a higher price. The right pick depends on the wall, the exposure, and the look you want. The styles available in impact glass cover most needs:

• Double-hung: the familiar two-sash window, available impact-rated for bedrooms and living spaces; see our double-hung window options.
• Casement and awning: crank-out units that seal tightly against wind pressure, a strong choice covered on our casement window page.
• Sliding and single-hung: simple, space-saving operation with the same laminated glass.
• Picture and fixed: large fixed panes that show off a view while taking a hit and staying put.

Impact windows cost more than standard windows because there is more glass, more frame, and more labor in every unit. Rather than chase a price online, it helps to understand what moves the number on a quote, since two similar-looking homes can land far apart. The biggest drivers are the size and number of openings, the glass package, and how the windows have to be installed.

Larger windows need more laminated glass and heavier framing, and operable styles cost more than fixed ones because every moving seal has to stay tight enough to keep the impact rating. The frame material, the interlayer thickness, and any energy upgrades all add to the unit price. On the labor side, anchoring an impact window into the structure takes longer than a basic swap, and older Columbus and Cincinnati homes often hide rotted sills or out-of-square openings that only show up once the trim comes off.

Because the work is a full replacement, the only honest way to price it is to look at your actual openings. A no-pressure assessment sorts the real cost drivers for your home from the guesswork, and gives you a figure based on what is really behind the trim rather than a national average.

The most common misunderstanding about impact windows is that you can convert the ones you have. You cannot. The rating belongs to the whole assembly, so true impact resistance means replacing the unit and anchoring the new one into the wall framing. No film, insert, or single pane of laminated glass dropped behind an old frame earns the same certification, which is why this is a replacement project and not a quick fix.

Installation quality decides whether the rating means anything. The anchors, the fasteners, and the structural sealant have to go in to the manufacturer’s tested specification, because a perfect impact window bolted to a rotted sill will still fail at the weakest point. This is genuinely not a do-it-yourself job; it calls for a crew that has set impact units before and knows how older Ohio openings behave once they are opened up.

Care, by contrast, is easy. Laminated glass cleans like any other window, and there is no shutter hardware to oil or storm panel to store. An annual check of the weatherstrip and the frame seals keeps the unit performing, and any chip or crack should be looked at promptly so moisture does not work its way into the laminate.