Besides the glass or plastic component of a skylight, what other factors would make it vulnerable to wildfire exposures?

Take a careful look at and around your skylights, and observe where debris accumulates. If that debris is ignited, what portion of the skylight would the flame impinge on? The best solution would be to keep debris cleared away from the skylight. Normally debris doesn't stay on the domed skylights, but can stay on the flat ones and on the uphill side of the skylight.

The operable skylight shown in this photograph has a domed acrylic shell. It was installed in the late 1980ís and does not have an inner layer of flat glass, but since it can be opened, has a screen at the top of the skylight frame. Similar to windows, an open skylight would be vulnerable to the entry of embers. They should be closed when wildfires are burning nearby.

Skylights that contain a layer of tempered glass over a layer of labeled fire resistant polished wire glass (so, two different layers of glass) would be a good option to improve their wildfire resistance. Skylights with this construction are commercially available.

Besides the glass or plastic component of a skylight, what other factors would make it vulnerable to wildfire exposures?

Take a careful look at and around your skylights, and observe where debris accumulates. If that debris is ignited, what portion of the skylight would the flame impinge on? The best solution would be to keep debris cleared away from the skylight. Normally debris doesn't stay on the domed skylights, but can stay on the flat ones and on the uphill side of the skylight.

Another photograph showing the roof of a home in a forested areas and showing the accumulation of vegetative debris on the roof and around the skylights.

Does the roof have a steep slope? If the answer is 'yes', what kind of radiant exposure could the skylight 'see' (potentially from vegetation, or other nearby by buildings)? The potential severity of the radiant exposure would indicate how likely the glass would be to break.

As is always the case, vegetation management should be part of any solution. If tree branches overhang the roof, and specifically the skylight, they should be removed (even without considering a fire exposure, if an overhanging branch should break, it could break through the glass in the skylight). In this photograph, overhanging vegetation resulted in debris accumulation on top of these flat skylights.

This is a photograph of a skylight in an untreated wood shake roof. The wood shake roof is by far the more vulnerable component on this home.