A sloped glass skylight over an occupied space uses glass glazing. For occupant safety against falling glass, the glazing is generally required to be:

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Sloped/overhead glazing over occupied areas must resist falling as dangerous shards, so the code generally requires laminated glass (which holds together) or fully tempered glass protected by a screen, following the sloped glazing provisions. Annealed glass, plain wired glass, and mere thickness do not satisfy overhead safety.