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Skylights are the single most failure-prone penetration in a Florida roof system — and also one of the most requested features in Tequesta and Jupiter Island luxury residential design. The conflict between what homeowners want and what Florida’s climate demands is resolved entirely in the specification and installation details. A properly specified, correctly flashed, impact-rated skylight on a tile or metal roof in Palm Beach County will perform without issue for 20+ years. A poorly specified or incorrectly flashed skylight will leak — often within the first hurricane season — and the resulting water damage to interior finishes, structural framing, and insulation routinely costs 10 to 20 times the original skylight installation cost to remediate.
Florida’s Unique Skylight Risk Environment
Skylights in Florida face a compounding set of environmental stressors that make national product specifications and installation standards inadequate guides for this market. The combination of sustained high UV radiation, extreme thermal cycling, wind-driven rain at hurricane intensities, and salt air infiltration creates a performance environment that eliminates most of the margin for specification error that exists in milder climates.
UV degradation is the first and most persistent threat. Florida receives roughly 3,000 hours of sunshine annually — approximately 40% more than the national average. This sustained UV exposure degrades the sealant systems, glazing seals, and curb flashing materials that are essential to skylight watertightness at a rate that makes the 20-year performance claims of manufacturers tested in northern climates functionally irrelevant. Sealants that last 15 years in Boston last 8 in Tequesta. Glazing seals that maintain integrity for 25 years in Seattle show compression set and leakage in South Florida within 12.
“A skylight that performs adequately for 10 years in Minnesota will fail in its third Florida summer. The UV load, thermal swing, and wind-driven rain intensity in Palm Beach County require a fundamentally different specification.”
Flashing: Where the Majority of Skylight Leaks Begin
In our experience remediating skylight failures across Tequesta, Jupiter, and the barrier island communities, flashing deficiency accounts for approximately 70% of skylight leak events. The flashing system — the metal and sealant assembly that creates a watertight transition between the skylight curb and the surrounding roof surface — is the most technically demanding detail in the entire skylight installation. It is also the most frequently under built.
The fundamental flashing requirement for a skylight on a tile roof in Palm Beach County is a continuous aluminum pan flashing that integrates with the tile underlayment system below the tile surface and rises to a height sufficient to resist wind-driven water at the curb. The common failure mode is a flashing system that terminates at tile level rather than integrating beneath the tile — a system that relies on sealant at the tile-to-curb junction to provide watertightness. Sealant-dependent skylight flashing systems fail. In Florida, they fail faster.
Integrated pan flashing — never surface-applied The flashing system must integrate beneath the tile underlayment, not rely on sealant at the tile surface. Surface-applied flashing is a temporary repair, not a permanent installation.
Minimum 4-inch curb height A 4-inch curb height is the minimum for wind-driven rain resistance in Palm Beach County. Low-profile curb skylights are not appropriate for Florida coastal applications.
Factory-fabricated saddle flashings Field-fabricated corner saddles are the most common skylight failure location. Require factory-engineered saddle details from manufacturers with Florida installation experience.
Positive head drainage design Water from above the skylight must be routed around — not toward — the skylight. Verify the head flashing design creates a positive drainage path before installation begins.
Glazing Selection for Florida Heat and UV
Skylight glazing selection in South Florida requires balancing three competing performance requirements: solar heat gain control, UV transmission management, and structural integrity under impact loading. The glazing specification that optimizes one of these requirements often compromises the others, which is why skylight glazing in this market requires deliberate specification rather than accepting the default option in a manufacturer’s catalog.
Solar heat gain is the dominant glazing concern for most Florida homeowners, and rightly so. An unshaded skylight with clear glazing in a South Florida climate acts as a solar collector for the conditioned space below — introducing heat load in direct proportion to its area. Low-e coatings on the interior glass surface of an insulated glazing unit can reduce solar heat gain coefficients to 0.25–0.35 — a reduction of 60–70% compared to clear glass — while maintaining visible light transmission that makes the skylight functionally useful. Specifying skylights without low-e glazing in South Florida is an energy performance decision that will be felt in every cooling bill for the life of the installation.
“Low-e tempered laminated glass is not an upgrade option for Florida coastal skylights — it is the baseline specification. Clear or single-pane glazing has no place in a Tequesta or Jupiter home.”
Hurricane Code Compliance for Skylights
Skylights in Palm Beach County are regulated as large missile impact-rated openings under the Florida Building Code — the same category as windows and doors in the High-Velocity Hurricane Zone designation. Every skylight installed in a permitted project must carry a current Florida Product Approval number that covers both the impact resistance of the glazing assembly and the wind pressure resistance of the frame and installation system at the design wind speed for the specific property location.
The large missile impact test requires the glazing to withstand the impact of a 9-pound 2×4 lumber projectile traveling at 50 feet per second without penetration of the protected opening — a simulation of wind borne debris during a hurricane event. Standard tempered glass fails this test. Laminated glass with a PVB interlayer of sufficient thickness passes it. This is why the glazing specification is not optional for code-compliant skylight installation in this market.
Florida Product Approval required on every skylight Confirm the FPA number covers both large missile impact and wind pressure resistance at your property’s design wind speed before purchase.
Tempered laminated glazing — no exceptions Standard tempered glass does not pass the large missile impact test. Laminated glass with PVB interlayer is the only compliant glazing for Palm Beach County skylights.
Corner and edge locations require higher pressure ratings Specify skylight location on the permit drawings before selecting the product — the wind pressure requirement varies significantly by roof zone.
Permit and inspection are mandatory No area threshold exempts skylights from the permit requirement. The flashing inspection before roof close-in is the only independent quality gate in the installation process.
