Parapet Wall Repair
Parapet Wall Membrane and Cap Detail, Toronto
Membrane and cap detailing along a repaired parapet, where the roof surface meets the wall.

Photographs From This Job
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About this job
Membrane and cap detailing along a repaired parapet, where the roof surface meets the wall. Two things are happening in these photographs. The membrane is being carried up the vertical face and terminated high enough to sit above any water that could pond against it, and the cap on top of the wall is being set so that it sheds back onto the roof rather than onto the outside face of the masonry. A cap that drains outward looks fine and slowly saturates the wall beneath it, which is why so many Toronto parapets are soft at the top and sound lower down. The termination itself matters as much as the height. Membrane held on by adhesion alone at the top of an upstand is a detail waiting for a windy night. Done properly, this junction stops being the weak point of the roof and becomes an ordinary part of it, which on a low-slope roof surrounded by parapets is most of the battle.
Project summary
- System installed
- Parapet rebuild with membrane and reflashing
- Scope
- Membrane and cap detailing at the roof-to-wall junction
- Property type
- Low-slope roof, Toronto
- Crew notes
- Cap set to shed water back onto the roof
Systems used on this job
What This Job Involved
In the words written against these photographs.
What is happening here
The membrane is being carried up the vertical face and terminated high enough to sit above any water that could pond against it, and the cap on top of the wall is being set so that it sheds back onto the roof rather than onto the outside face of the masonry.
The detail that decides it
A cap that drains outward looks fine and slowly saturates the wall beneath it, which is why so many Toronto parapets are soft at the top and sound lower down.
Why we do it this way
Membrane held on by adhesion alone at the top of an upstand is a detail waiting for a windy night.
Systems and Services on This Job
Where this work sits in what we do, and where to read more about it.
More Projects Like This One
More flat roof projects of the same type across Toronto and the GTA.
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