Complex parapets and roof edges · Lesson 4 of 4

Complex parapets and roof edges: defects, verification and case study

Where edges fail in the field, four paired defects with their corrections, a desk and field checklist, and a fictional clinic re-roof worked from reading the drawings to the questions to send.

You will be able to: Diagnose the common defects at complex parapets and roof edges, say what verification catches each, and work a fictional re-roof from the evidence to a corrected schedule and an RFI log.

11 min · 12 slides · 7 questions

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Slide 1 of 12

Where edges fail

FEMA says public buildings with low-slope roofs often fail at the edges, from wind lifting and peeling metal edge flashings, copings or fascia covers.

A FEMA Hurricane Michael team recommended that copings and edge flashings comply with ES-1 to prevent blow-off, and noted that blown-off copings can lift and peel the membrane. IIBEC and ARMA authors quote it.

Sources

Glossary

Peel-stop bar: A bar over the roof membrane near the edge flashing or coping that gives secondary protection against membrane lifting and peeling if the flashing or coping fails (FEMA P-2181).
Termination metal: Metal applied where a coping meets a wall; Building Enclosure names letting the coping butt up to the wall as the most common mistake there.
RFI: A request for information: a written question sent to the designer of record or the maker, answered in writing before work is covered.
Blow-off: The wind removal of a coping or edge flashing, which can lift and peel the roof membrane (FEMA Hurricane Michael recommendation, quoted by IIBEC and ARMA authors).