Tutorials › Plumbing › Venting - Loop
Venting - Loop
💡 Create a multi-storey vent loop connecting into the riser above the fixtures.
What it does
Venting ▸ Venting - Loop works just like Venting - Stack up to the point where you pick the stack and the drainage run; from there, instead of connecting directly, it raises a vertical riser and connects into the stack at the elevation you enter — suggested automatically from the rim of the fixtures on the same system — using a 45° junction. This is the option for multi-storey buildings, connecting into the riser above the fixture rim (bathroom level + 15 cm).
When to use it
When there is no vent stack close enough to the drainage run and code requires a loop climbing above the fixture rim before connecting to the riser.
Prerequisites
- Riser/vent stack defined for the connection.
- Drainage run to be vented already modeled and connected.
- Being in a view that shows multiple levels (section or 3D), since the riser crosses slabs.
Video
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Common errors
| Symptom | Likely cause | Solution |
|---|---|---|
| The riser does not cross the slab correctly | The active view does not show the levels involved | Run the command again in a 3D view or section that includes the levels |
| The stack does not show up in the selection | Stack not modeled or out of the view's range | Confirm that the stack exists and is visible |
| The suggested elevation does not suit the project | The rim of the system's fixtures was not detected correctly | Enter the desired connection elevation manually |
| Button greyed out | License without the Plumbing · Venting feature | Check your license / contact support |