Watch how hurricane winds try to rip open your roof hatch. The lid experiences massive uplift that the latches and hinges must resist to keep your building enclosed.
Each part plays a role in resisting hurricane wind forces.
Wind-Rated Latches
Cam-action or spring-loaded latches rated for design uplift. Two minimum required.
Heavy-Duty Hinges
Continuous piano hinge or multiple strap hinges rated for cyclic loading.
Reinforced Lid
Steel or aluminum lid with stiffeners to resist deformation under wind pressure.
Curb Anchorage
Anchors at 12-18" spacing to resist uplift and prevent curb separation.
Common Failure Modes
How roof hatches fail during hurricanes.
Latch Failure
Standard gravity latches pop open under uplift. Spring or cam latches with positive engagement are required.
Hinge Tear-Out
Hinges pull out of the lid or curb from repeated cycling and stress concentration at fastener holes.
Lid Deformation
Thin gauge lids bend and allow wind to get underneath, progressively peeling the lid open.
Curb Separation
Entire curb assembly lifts off the roof from inadequate or corroded anchorage.
Roof Hatch FAQs
What wind loads do roof hatches experience in Broward County?
Roof hatches in Broward County experience significant uplift loads trying to open the lid against its latches. At 175-180 mph design wind speed, a standard 3x3 foot roof hatch might see 800-1200 lbs of uplift force on the lid. The curb also experiences uplift trying to separate it from the roof structure.
Do roof hatches need latches rated for wind loads?
Yes. In hurricane zones like Broward County, roof hatch latches must be rated to resist the design wind uplift. Standard gravity latches are not adequate. Spring-loaded or cam-action latches with positive engagement are required. The NOA will specify the latch capacity and number of latches required.
How is a roof hatch curb anchored to the structure?
Roof hatch curbs are anchored similar to skylight curbs - through the roof deck into the framing below. Anchors are typically spaced 12-18 inches around the perimeter. The curb must have continuous support, not just at the corners. Both uplift and lateral forces must be resisted by the anchorage.
What is the minimum curb height for a roof hatch in Florida?
Florida Building Code requires a minimum curb height of 4 inches for roof hatches. However, most manufacturers recommend 8-12 inch curbs for proper water management and easier access. In high wind zones, taller curbs provide better structural performance and flashing details.
Why do roof hatches fail during hurricanes?
Roof hatches fail during hurricanes from: latch failure allowing the lid to blow open, hinge failure from repeated cycling, curb separation from inadequate anchoring, and lid deformation from debris impact. Once the lid opens, interior pressurization can cause catastrophic building damage.
Calculate Your Roof Hatch Wind Loads
Get the exact uplift forces, latch requirements, and curb anchorage specifications for your Broward County installation.