Why roof edges fail first, the four jobs a parapet does, the words for each part, the conditions that make a parapet complex, and the line between what a fabricator makes and what the designer of record decides.
You will be able to: Name the parts of a complex parapet and its edge metal, separate the three meanings of corner, say which jobs a parapet does at once, and state who decides what on a project.
10 min · 10 slides · 6 questions
All lessons in this moduleA study of FM Global losses on built-up roofs, quoted in a SPRI seminar, found that 59% occurred because the roof perimeter failed (2005, built-up roofs).
FEMA says low-slope roofs on public buildings often fail at their edges, where wind lifts and peels metal edge flashings, copings or fascia covers.
That is why this module is about parapets and roof edges, where the details are hardest.