Parapet
A parapet is the low wall that extends above the roof edge on a flat or low-slope roof.
A parapet is the low wall that extends above the roof edge on a flat or low-slope roof.
Definition
A parapet is a short wall that rises above the roof surface at the edge. It can hide equipment, protect people, and affect how the roof drains.
A plain example
Illustrative example only: a flat roof has a parapet whose inner face carries the roofing membrane up the wall with flashing and is capped on top to keep water out.
Why it matters
Parapets are a common leak location because the roof membrane, wall and cap must all connect. Height may also be set by code for fall protection.
Common confusion
A parapet is not a guardrail, though it may serve as one if it meets the required height.
On a project
Confirm wall height, coping or cap, flashing and drainage details, and any code height requirement for edge protection.
Quick answers
- Why do parapets leak? Joints between the roof, wall face and cap are exposed to water.
- Does a parapet need flashing? Yes, where the roof meets the wall and at the cap.
- Can it serve as a guardrail? Only if it meets the code height and strength requirement.
Related terms
Always check the project drawings and specification, and confirm requirements with the engineer of record and the local authority.
Questions people ask
Why do parapets leak?
Joints between the roof, wall face and cap are exposed to water.
Does a parapet need flashing?
Yes, where the roof meets the wall and at the cap.
Can it serve as a guardrail?
Only if it meets the code height and strength requirement.
Sources and further reading
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