Technical Standards
Must meet ASTM E1886/E1996 Large Missile D standards. HVHZ (High Velocity Hurricane Zone) certification requires glass to stay in the frame after multiple 9lb 2x4 impacts.
Coastal Durability
Selection of PVB or SGP (SentryGlas) interlayers to resist "delamination" and salt-fog infiltration. Kynar-coated aluminum frames are standard for coastal oxidation resistance.
Maintenance Protocol
Regular inspection of weep-hole drainage and perimeter caulking. Annual lubrication of stainless steel multipoint locking hardware to ensure airtight seals.
Impact Window & Door Specs
High-performance glazing and structural framing for 170MPH+ wind zones.
In Palm Beach, impact windows are the primary defense for the building envelope. Beyond storm protection, they serve as critical thermal barriers and sound-dampening systems. Understanding the Design Pressure (DP) and interlayer chemistry is essential for long-term coastal performance.
Impact Glazing Standards
- SGP Interlayers: SentryGlas is 100x stiffer and 5x stronger than standard PVB, making it the preferred choice for large-span doors and high-exposure oceanfront windows.
- Thermal Efficiency (Low-E): Multi-layered silver coatings reflect infrared light, reducing solar heat gain in South Florida's intense UV environment.
- Structural Depth: Commercial-grade frames with 3-inch or greater depth provide the necessary "bite" to keep glass secured during extreme negative pressure cycles.
- Corrosion-Resistant Hardware: All rollers, hinges, and locks must be 300-series stainless steel to prevent salt-air seizure and "tea staining."
Frequently Asked Questions
What is the difference between Impact and "Hurricane Proof"?
No window is "hurricane proof." Impact windows are designed to shatter upon impact but remain bonded to the interlayer, preventing wind from entering and pressurizing the home.
Why is my impact glass turning cloudy at the edges?
This is "delamination." It happens when moisture or salt air penetrates the interlayer. In coastal areas, this is often a sign of failed perimeter sealant or clogged weep holes.
Do impact windows lower insurance premiums?
Yes. In Florida, wind-mitigation credits are legally required for homes with 100% impact-rated openings, often reducing the wind portion of premiums by 30% or more.