Definition
High-Velocity Hurricane Zone (HVHZ) is the Florida designation for areas (Miami-Dade and Broward Counties) with the most severe hurricane wind exposure. Stricter solar PV structural design requirements apply, including FBC HVHZ provisions on top of ASCE 7.
Key Takeaways
- HVHZ = Florida hurricane high-wind zone (Miami-Dade, Broward).
- Florida Building Code HVHZ provisions supplement ASCE 7.
- Design wind speeds 170+ mph; uplift can exceed 50 psf.
- FM Global Approved equipment often required by insurance.
- Specialized racking and mounting expertise needed.
Frequently Asked Questions
4 commonly searched questions about HVHZ (High-Velocity Hurricane Zone).
What is HVHZ?
High-Velocity Hurricane Zone — Florida designation for Miami-Dade and Broward Counties where hurricane wind speeds are highest. Florida Building Code (FBC) HVHZ provisions add to standard ASCE 7.
Design wind speeds in HVHZ?
170+ mph design wind speeds (V_ult, Risk II). Wind uplift on PV modules can exceed 50 psf. Special attachment, ballast, and edge-zone provisions.
Does FM Global approval matter in HVHZ?
Yes. FM Global Approval Standard 4476 + 4478 sets PV roof attachment specs. Insurance carriers (FM Global, Travelers) often require FM-approved equipment.
Can ballasted racking work in HVHZ?
Limited. Most HVHZ projects use mechanically-attached racking. Specialized FM Global Approved ballast products exist but require detailed analysis.
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