Parapet Wall
A low wall extending above the roofline at the edge of a flat or low-slope roof. Parapets provide fall protection and a finished appearance to commercial buildings.
What Is a Parapet Wall
A parapet wall is a low wall that rises above the roof surface at the perimeter of a flat or low-slope roof. Parapets are standard on commercial buildings and some residential flat-roof designs.
The parapet serves multiple functions: it conceals mechanical equipment, provides fall protection at the roof edge, and creates a finished architectural look.
Waterproofing Components
Parapet waterproofing involves three critical elements. Coping caps the top of the wall to shed water. Base flashing connects the roof membrane to the vertical wall surface. Through-wall flashing prevents moisture from migrating through the wall assembly.
Common Parapet Problems
Parapet walls are exposed to weather on three sides, making them vulnerable to freeze-thaw damage, mortar deterioration, and coping failures. Failed parapet flashing is one of the leading causes of leaks on commercial flat roofs.
Frequently asked questions
A parapet is a low wall that extends above the roof edge on flat and low-slope roofs. It conceals the roof membrane edge and provides a barrier at the roof perimeter.
Parapet walls are protected by coping on top (metal or stone cap) and base flashing where the roof membrane meets the wall. Both must be properly sealed to prevent water intrusion.
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