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Impact Windows
All you need to know about impact windows, in one place!
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What are Impact Windows?
Impact windows are specially engineered windows designed to protect homes from hurricane-force winds, windborne debris, and forced entry. Unlike traditional windows, they use laminated impact-resistant glass and reinforced frames that remain intact even when struck by flying objects. Because of their strength and durability, impact windows are required or highly recommended in many parts of South Florida where hurricanes and severe weather are a regular concern.
But it's not just about safety; these windows elevate your everyday living. Enjoy a quieter, more serene atmosphere with reduced noise, and keep your home cooler in the summer and warmer in the winter, saving money on your energy bills. Plus, your beautiful furniture and décor will stay vibrant longer, protected from the sun's fading rays.
Impact Windows: Built For Strength. Designed For Life.
Impact windows are engineered for superior performance and lasting peace of mind. They consist of two or more panes of glass permanently bonded with a durable interlayer. If the glass is struck by debris, the interlayer helps hold the broken pieces together, this allows the window to continue protecting the home's envelope during severe storms.
If you’re ready to experience the difference that impact-resistant products can make in your home, visit our impact windows replacement & installations page and request your free quote.
Protect Your Home and Family with Category 5 Rated Hurricane Impact Windows & Doors
Protect your home with confidence. Our impact windows and doors, crafted by Mr-Glass Doors & Windows Manufacturing, meet the most demanding South Florida hurricane requirements, including large-missile impact testing.
How Does the Large Missile Impact Testing Work?
Large Missile Impact Testing is a safety evaluation for windows and doors designed to simulate the blunt-force impact of heavy windborne debris. It determines whether a system can remain intact to prevent structural collapse during hurricanes or severe storms.
How the Test Works
- The Projectile: An air cannon fires a 9 lb piece of 2 × 4 lumber at the window at a speed of 50 ft/s (approximately 34 mph).
- The Evaluation: The glass is permitted to crack or shatter, but the projectile must not penetrate the interior, and no openings larger than a specified size can form.
- Cyclic Pressure: After the impact, the window is placed in a test chamber and subjected to thousands of positive and negative wind pressure cycles. This replicates the fluctuating forces of high-speed winds trying to pull or push the window out of the wall
Impact Windows vs Regular Windows
At first glance, impact windows may look similar to traditional windows, but the differences go far beyond appearance. The comparison table below highlights some of the key differences between impact windows and standard residential windows.
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Feature
Impact Windows
Regular Windows
Storm Protection
Designed to withstand hurricane-force winds and flying debris, helping protect your home's exterior envelope during severe weather.
Designed for everyday weather conditions but not engineered to resist hurricane impacts or flying debris.
Glass Construction
Uses laminated impact-resistant glass with a durable interlayer that helps hold broken glass together after impact.
Typically uses standard tempered or insulated glass that can shatter when struck by heavy debris.
Frame Strength
Reinforced frames and heavy-duty hardware are engineered to meet Florida's stringent building code requirements.
Standard frames are designed for normal residential use and are not intended for extreme wind events.
Security
Offers increased resistance against forced entry because the laminated glass is more difficult to penetrate.
Can generally be broken more easily, providing less resistance to intruders.
Energy Efficiency
Many impact windows include energy-efficient glass packages and Low-E coatings that help reduce heat transfer and improve indoor comfort.
Energy efficiency varies by product and may not offer the same level of thermal performance.
Noise Reduction
Laminated glass helps reduce outside noise, creating a quieter indoor environment.
Provides less sound insulation than laminated impact glass.
UV Protection
Helps block a significant amount of harmful UV rays, reducing fading of furniture, flooring, and fabrics.
Offers limited UV protection unless upgraded with specialty glass coatings.
Building Code Compliance
Designed to meet or exceed Florida's hurricane and wind-load requirements where applicable.
May not satisfy the impact-resistance requirements in many coastal or High Velocity Hurricane Zones (HVHZ).
Best For:
Homes in hurricane-prone regions like South Florida where storm protection, energy efficiency, and security are priorities.
Homes in areas with milder weather or where impact-resistant construction is not required.
Understanding DP Ratings For Impact Windows
What Are DP Ratings For Windows?
When shopping for impact windows in South Florida, you’ll frequently see a metric called a DP (Design Pressure) rating. In simple terms, a DP rating measures a window’s structural strength and its ability to withstand three specific environmental forces: positive wind pressure (pushing against the window), negative wind pressure (pulling outward as wind rushes past), and water resistance. The higher the DP rating, the stronger the window.
How are DP Ratings Calculated?
DP ratings are expressed as a number (e.g., DP 30, DP 50, or DP 70) determined by laboratory testing. To achieve a specific rating, the window must successfully withstand laboratory test pressures equal to 1.5 times that rating without structural failure or glass blowout.
Example: A window rated DP 50 has been tested to survive a structural load of 75 pounds per square foot (psf).
What DP Rating Do You Need in South Florida?
The DP rating needed for your home isn't one-size-fits-all; it depends heavily on your specific geography, proximity to the coast, and your home’s engineering.
- Standard Areas: Inland properties typically require a minimum of DP 30 to DP 40.
- High-Velocity Hurricane Zones (HVHZ): Because coastal areas like Miami-Dade, Broward, and Palm Beach counties experience intense cyclic wind pressures during Category 4 or 5 hurricanes, homes here generally require heavy-duty windows with a DP 50 to DP 70+ rating.
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Impact Window FAQs
What are impact windows?
Impact windows are specially engineered windows designed to withstand hurricane-force winds and flying debris. They work by using laminated impact-resistant glass, made of two panes bonded to a strong interlayer that holds the glass together even if it cracks. Unlike regular windows, which can shatter and fail under pressure, impact windows remain intact, helping prevent wind, water, and debris from entering the home. While no window is completely indestructible, impact windows are tested to resist extreme storm conditions and significantly reduce the risk of structural damage during hurricanes. They are certified through rigorous standards such as Miami-Dade County, Florida Building Code (FBC), and ASTM impact and pressure testing. The terms impact-resistant windows and hurricane windows are often used interchangeably, but both refer to windows that meet these same impact and pressure-rating requirements.
What are the benefits of impact windows?
Impact windows offer a wide range of benefits, including:
• Protection from storms: They safeguard your home from hurricane-force winds and flying debris, minimizing potential damage and reducing the need for costly repairs or replacements.
• Increased security: The strong construction deters break-ins and vandalism.
• Noise reduction: The laminated glass helps to dampen outside noise, creating a more peaceful indoor environment.
• Energy efficiency: Impact windows can improve insulation, reducing energy costs.
• UV protection: They often include UV-resistant coatings that help prevent fading of furniture and interiors.
• Increased home value: Impact windows are a desirable feature for potential buyers, as they offer enhanced safety and protection, which can significantly increase your home's market value.
How do impact windows differ from regular windows?
The key difference lies in the construction. Impact windows have a strong interlayer, usually made of polyvinyl butyral (PVB), between the glass panes. This interlayer holds the glass together upon impact, preventing it from shattering into dangerous shards.
Are impact windows worth the investment?
If you live in an area prone to hurricanes or severe weather, or if you simply want to enhance your home's security and energy efficiency, impact windows are a worthwhile investment. They offer peace of mind and long-term value.
Do impact windows come in different styles?
Absolutely! Impact windows are available in a wide variety of styles, including single-hung, casement, awning, sliding, and picture windows, as well as specialty shapes. You can find impact windows to match any architectural style and personal preference.
How do I know if my windows are impact-resistant?
Look for a permanent label or etching on the glass or window frame indicating that it meets impact-resistant standards, such as those set by the American Society for Testing and Materials (ASTM).
Can I install impact windows myself?
While it's technically possible, it's generally recommended to have impact windows professionally installed. Proper installation is crucial for ensuring their performance and maximizing their benefits.
Do impact windows require special maintenance?
Impact windows require minimal maintenance. Clean them regularly with mild soap and water to keep them looking their best.
What financing options are available for impact windows?
Many companies offer a variety of financing options to make impact windows more affordable, including payment plans, loans, and other financing solutions. Be sure to ask about available financing options to find a plan that fits your budget.
Do Impact Windows Block UV Rays?
Yes. Most modern impact windows are built with laminated glass and can include Low-E coatings that block a significant amount of harmful UV rays. This helps protect your flooring, furniture, artwork, and other interior finishes from fading while allowing natural light into your home. As an added benefit, reducing solar heat gain can also improve indoor comfort and energy efficiency.
Can Impact Windows Lower Insurance Premiums?
They can. Many insurance providers offer discounts for homes equipped with code-compliant impact windows because they help protect against hurricane damage and windborne debris. The amount of savings varies based on your home's location, insurer, and the level of hurricane protection installed. *We recommend speaking with your insurance provider to learn what discounts may apply to your policy.
Are Impact Windows Energy Efficient?
Yes. Impact windows are designed to improve your home's energy efficiency by reducing heat transfer and limiting solar heat gain. Features such as insulated glass and Low-E coatings help keep your home cooler in South Florida's climate, reducing the workload on your air conditioning system and potentially lowering monthly energy costs.
How Long Do Impact Windows Last?
High-quality impact windows typically last 20 to 30 years or more when professionally installed and properly maintained. Their lifespan depends on factors such as the quality of the materials, exposure to coastal conditions, and routine maintenance. Regular cleaning and periodic inspections can help maximize performance and longevity.
