Flat skylights contain tempered glass. Domed ones have an acrylic outer shell, usually with an inner layer of flat glass. Neither of these configurations could pass a “Class A” fire test. Skylights that contain a layer of tempered glass over a layer of UL-labeled, fire-resistant polished wire glass would be a better option, and they are readily available. Take a careful look at and around your skylights, and observe where debris accumulates. If that debris ignited, what portion of the skylight would the flame contact? The best solution would be to keep debris cleared away from the skylight on a routine basis. Normally, debris doesn't stay on the domed skylights, but can stay on top and on the uphill side of the flat skylights. If your roof has a steep pitch, what amount of radiant heat could contact the skylight? (Radiant heat could be generated from nearby burning vegetation and buildings.) Vegetation management should be part of your solution. If tree branches overhang your skylight, they should be removed.

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