Commercial Skylight Repair in Tampa, FL

Commercial Skylight Repair

Commercial skylight repair in Tampa - curb flashing, glazing seal, dome replacement, structural curb repair, and hurricane-rated skylight restoration for flat and low-slope commercial buildings in the Tampa Bay metro.

Skylights on Tampa Bay commercial flat roofs are among the highest-maintenance elements on the building envelope - the curb flashing is the most thermally stressed roof-to-wall transition on the building, the glazing system takes direct Gulf UV load, and hurricane wind pressure on the dome or glazing panel is among the highest any building component faces in the coastal HVHZ exposure zone.

Commercial skylights on Tampa Bay flat roofs are not passive architectural features. They are complex penetrations in the building envelope that require the same engineering attention as any other roof penetration - and more maintenance attention than most, because the curb flashing, the glazing seal, and the dome or glass unit are all exposed to the full force of Tampa Bay's climate without the protection that the building structure provides to other envelope elements.

The skylight repair calls we receive across the Tampa Bay commercial market fall into three categories. The most common is curb flashing failure - the flashing at the base of the skylight curb has separated from the membrane, usually at the upslope or corner transitions, allowing water to infiltrate behind the curb and into the roof assembly. The second most common is glazing seal failure - the sealant joint between the skylight unit and the curb cap has dried, cracked, or lost adhesion, producing a leak that runs directly into the interior through the sealant line. The third category, which is less frequent but more consequential, is structural curb damage from hurricane wind loading - the skylight curb has deflected or cracked under wind pressure, compromising the flashing seal and in some cases cracking the glazing unit.

Hurricane Milton's 2024 track across Hillsborough County produced structural skylight damage on multiple commercial buildings in the Westshore corridor and the TIA-adjacent industrial district - primarily on older skylight curbs that were not designed to current FBC HVHZ wind pressure requirements. Several of those buildings had skylights that were below the minimum impact-resistance standards that FBC HVHZ provisions require for skylight glazing in the coastal exposure zone. The glazing impact standard is not a marginal requirement in this market - Tampa Bay's Gulf Coast position puts it in the highest hurricane-frequency zone in the continental United States.

Skylight Curb Flashing Repair - The Most Common Tampa Skylight Failure

The skylight curb flashing is a continuous membrane wrap from the roof field surface up the four faces of the curb and onto the curb top, where it terminates under the skylight unit or under the coping cap that supports the glazing frame. On a mechanically attached TPO roof, the curb flashing is typically a separate piece of membrane that is adhered to the curb face with bonding adhesive and terminates at the top of the curb with a termination bar secured into the curb wood or metal framing.

The thermal cycling load on a Tampa skylight curb flashing is severe. The curb top temperature on a south-facing skylight with a dark membrane can reach 160 to 180 degrees Fahrenheit on a Tampa summer afternoon. The overnight ambient temperature drops to 74 to 78 degrees in July, producing a 90-degree daily thermal cycle that stresses the bonding adhesive joint between the membrane and the curb face. After five to eight years, the adhesive joint at the top 3 to 4 inches of the curb face - the most highly thermally stressed zone - typically shows bond failure, visible as membrane separation at the upper curb edge.

Curb flashing repair restores the adhesive bond, re-terminates the membrane at the curb top with new termination bar, and re-seals the curb-to-glazing frame joint with a compatible sealant. On curbs where the membrane separation has been present long enough to allow water infiltration into the curb framing, we assess the curb structural condition before re-flashing - wood curb framing that has been wet for multiple seasons may require replacement before the flashing repair can be done durably.

Glazing Seal and Dome Replacement

Acrylic dome skylights on commercial flat roofs have a typical service life of 15 to 25 years in Tampa Bay's UV environment, depending on dome thickness and original UV inhibitor specification. Tampa Bay receives some of the highest UV irradiance in the continental United States - the subtropical latitude combined with the Gulf of Mexico's high humidity creates an outdoor UV environment that degrades unprotected acrylic significantly faster than northern latitudes. Domes that are yellowed, crazed at the surface, or brittle at the base flange are past their service life and are likely to fail under the impact loading from hurricane-driven debris.

The Florida Building Code HVHZ provisions require skylights in the coastal exposure zone to meet an impact-resistance standard - either impact-rated glazing or an impact-resistant protective screen over the glazing. Older acrylic dome skylights installed before 2010 on buildings in the Hillsborough and Pinellas coastal HVHZ zone frequently do not meet the current impact-resistance requirement. We assess the glazing type and age during any skylight repair scope and flag non-compliant glazing for the building owner's attention - particularly on buildings where the insurer has requested documented FBC HVHZ compliance evidence.

Glazing seal replacement - removing deteriorated sealant at the skylight frame-to-curb cap joint, cleaning the contact surfaces, and applying new sealant - is a maintenance task rather than a structural repair. The sealant used at this joint must be compatible with both the skylight frame material (typically aluminum or vinyl) and the membrane or coping material at the curb top. We use a two-part polyurethane or a UV-resistant silicone rated for exterior use in a marine-adjacent environment for this joint - standard acrylic caulk fails within one to two seasons in Tampa Bay's thermal and UV environment.