Hurricane impact glass withstands winds of 150+ mph and missile impacts while blocking 99% of UV radiation. Regular glass fails at 70-90 mph winds and provides minimal UV protection. Impact glass also reduces noise by STC 32-40 and may qualify for insurance discounts of 5-45%. This guide compares construction, performance ratings, cost, and whether impact glass makes sense in the DC, Virginia, and Maryland area.
Last Updated: March 2026
Performance comparison of hurricane impact-rated laminated glass versus standard non-impact glass in residential windows.
| Feature | Hurricane Impact Glass | Regular Glass |
|---|---|---|
| Construction | Laminated: glass + PVB/EVA + glass | Single or double pane (not laminated) |
| Wind Resistance | 110-200+ mph (rated/tested) | 70-90 mph (typical failure point) |
| Missile Impact Test | Passes ASTM E1886/E1996 or TAS 201 | Not tested for impact |
| Break Behavior | Cracks but interlayer holds fragments | Shatters into loose shards |
| UV Blocking | 95-99% | 25-40% (single), 40-70% (double) |
| Sound Reduction (STC) | 32-40 | 24-28 (single), 28-32 (double) |
| Forced Entry Resistance | High -- interlayer prevents penetration | Low -- breaks and allows entry |
| Total Thickness | 7/16 to 9/16 inch per lite | 1/8 to 1/4 inch per lite |
| Weight (per sq ft) | 4-7 lbs per lite | 1.6-3.3 lbs per lite |
| Insurance Discount | 5-45% of wind premium | None |
| Relative Cost | 3-5x standard glass | 1x (baseline) |
The PVB/EVA interlayer blocks 95-99% of UV-A and UV-B radiation. This prevents fading of furniture, hardwood floors, carpets, artwork, and fabrics. Over a 10-20 year period, the reduced fading damage can represent significant savings on interior furnishing replacement. Standard glass allows 60-75% of UV radiation to pass through.
Even when the glass panes crack from a break-in attempt, the laminated interlayer holds the fragments in place, preventing an intruder from creating an opening. This forced-entry resistance is a significant security benefit for homes and businesses. Impact glass can withstand repeated blows without creating a passable opening, buying valuable time for alarm response.
The laminated construction dampens sound vibrations more effectively than monolithic glass. Impact glass achieves STC ratings of 32-40, reducing perceived noise by approximately 50-60% compared to a standard single-pane window. For DMV homes near Reagan National Airport, the Beltway, or Metro lines, this noise reduction significantly improves comfort.
Impact glass must pass rigorous testing to receive certification. Understanding these standards helps you evaluate product quality.
The national standard for impact-resistant glazing. Tests involve firing a 2x4 lumber piece (approximately 9 pounds) at the glass at 50 feet per second for large missile impact, or steel balls for small missile impact. After impact, the specimen is subjected to cyclic wind pressure testing to verify the opening was not created.
The most stringent impact test standard in the United States, required in the Miami-Dade High Velocity Hurricane Zone. The large missile impact test fires a 9-pound 2x4 at 50 fps, followed by 9,000 cycles of positive and negative wind pressure. Products passing this test are rated for the most extreme hurricane conditions.
Hurricane impact glass consists of two or more panes of glass bonded to a clear polyvinyl butyral (PVB) or ethylene-vinyl acetate (EVA) interlayer, typically 0.030 to 0.090 inches thick. When struck, the glass may crack but the interlayer holds the fragments in place, preventing the window from forming an opening. This laminated construction is similar to automotive windshield glass but manufactured to meet specific impact test standards (ASTM E1886/E1996 or Miami-Dade TAS 201/202/203) for resistance to wind-borne debris.
Hurricane impact glass is tested and rated for specific design pressures and missile impact levels. Standard impact glass is rated for wind speeds of 110-150 mph (Category 2-4 hurricanes). High-performance impact glass meets the most stringent standards -- Miami-Dade HVHZ (High Velocity Hurricane Zone) rated -- and is tested for 150-200+ mph winds with large missile impact (a 9-pound 2x4 lumber fired at 50 feet per second). Regular glass fails at wind pressures corresponding to 70-90 mph depending on size and thickness.
Homeowners insurance discounts for impact-rated windows and doors vary by insurer and location. In hurricane-prone states like Florida, discounts can reach 25-45% of the wind portion of the premium. In the mid-Atlantic region (DC, Virginia, Maryland), discounts are typically smaller (5-15%) because the hurricane risk is lower, but they still provide meaningful annual savings. Contact your insurance company for a wind mitigation inspection after installing impact glass to receive the maximum available discount. Some insurers also reduce deductibles for homes with full impact-rated glazing.
Yes, the PVB or EVA interlayer in impact glass blocks 95-99% of ultraviolet (UV) radiation, compared to 25-40% blocked by standard single-pane glass and 40-70% blocked by standard double-pane glass. This UV blocking protects furniture, flooring, artwork, and fabrics from fading. The UV protection is equivalent to applying high-quality window film but is permanently built into the glass assembly and cannot degrade or peel. Adding a Low-E coating further reduces solar heat gain while maintaining high visible light transmission.
Hurricane impact glass provides significantly better noise reduction than regular glass due to the laminated PVB/EVA interlayer, which dampens sound vibrations. Impact glass achieves STC (Sound Transmission Class) ratings of 32-40, compared to 24-28 for standard single-pane glass and 28-32 for standard double-pane glass. For homes near airports, highways, or busy streets in the DC, Virginia, and Maryland area, the noise reduction benefit of impact glass is a significant quality-of-life improvement even without hurricane concerns.
Hurricane impact glass typically costs 3-5 times more than standard non-impact glass of comparable size. A standard impact-rated window complete with frame costs significantly more than a standard window, though the price gap narrows with larger orders. The higher cost reflects the laminated glass construction, impact testing and certification, heavier-duty frames and hardware, and more complex installation. The total cost is partially offset by insurance discounts, UV protection (reduced fading), noise reduction, and enhanced security against break-ins.
While the DMV is not in a primary hurricane zone, the region does experience remnant tropical storms, severe thunderstorms with high winds (60-80+ mph), and occasional tornadoes. Impact glass provides year-round benefits beyond storm protection: 95-99% UV blocking, superior noise reduction (STC 32-40), enhanced security against break-ins (the interlayer holds glass in place even when shattered), and potential insurance discounts. For homeowners in high-exposure locations, near airports, or seeking maximum security and UV protection, impact glass is a worthwhile investment in the DMV.
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