Torch-Down Installation
2-Ply Modified Bitumen Torch-Down Installation, Toronto
A two-ply modified bitumen roof going down in the order it always goes down: base sheet first, mechanically set and rolled flat, then the cap sheet torched over it.
Photographs From This Job
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About this job
A two-ply modified bitumen roof going down in the order it always goes down: base sheet first, mechanically set and rolled flat, then the cap sheet torched over it. The frames show the base course already covering the field, which is the point at which a torch-down job is either going to be watertight or is not. Laps on the base are what the cap bonds into, so if they wander the whole assembly inherits the problem. You can see the sheets running in one direction across the deck with the laps held to a consistent width, which is what lets the cap course be laid square on top rather than chased around. Two plies is the specification we reach for on a Toronto residential low-slope deck because it gives redundancy: the cap can take the weather and the ultraviolet, and the base underneath is a second membrane rather than a felt. Torch work also means a fire watch and a clear perimeter, so the deck gets swept and the edges checked before the gas is lit. Nothing in these photographs is staged. This is what the roof looked like partway through the day.
Project summary
- System installed
- Two-ply modified bitumen, torch applied
- Scope
- Full field installation over a prepared deck
- Property type
- Low-slope roof, Toronto
- Crew notes
- Base sheet laid and rolled before any flame reached the roof
Systems used on this job
What This Job Involved
In the words written against these photographs.
What is happening here
You can see the sheets running in one direction across the deck with the laps held to a consistent width, which is what lets the cap course be laid square on top rather than chased around.
The detail that decides it
Two plies is the specification we reach for on a Toronto residential low-slope deck because it gives redundancy: the cap can take the weather and the ultraviolet, and the base underneath is a second membrane rather than a felt.
Why we do it this way
Torch work also means a fire watch and a clear perimeter, so the deck gets swept and the edges checked before the gas is lit.
Systems and Services on This Job
Where this work sits in what we do, and where to read more about it.
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