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Slope

This rule checks whether pipes in MEP systems have a slope value assigned.

⚠️ Pipes without a defined slope can cause performance issues in real-world systems and may fail to comply with modeling standards.

What Is Checked

  • The slope parameter of each pipe instance is validated.
  • Pipes with a missing or zero slope value are flagged.

Why Slope Matters

Including slope values in pipe systems is essential for both physical system behavior and BIM data quality. It ensures:

  • ✅ Proper Drainage: Slope allows fluids (e.g., wastewater, rainwater) to flow naturally, avoiding pooling and blockages.
  • ✅ Air Lock Prevention: A slope helps displace trapped air, preventing pressure issues and flow interruption.
  • ✅ Self-Cleaning Effect: Gravity-assisted flow reduces sediment buildup and minimizes maintenance.
  • ✅ Compliance with Codes: Many building codes require minimum slopes for drainage and fluid transport systems.
  • ✅ Material Protection: Consistent flow reduces stagnation, lowering the risk of corrosion or biofilm growth.

How to Fix

  1. Select the pipe element in Revit.
  2. In the Properties palette, locate the Slope parameter.
  3. Enter an appropriate slope value, depending on the system type and design requirements.
  4. Example: 1% or 0.01 for minimal drainage slope.
  5. Confirm the slope is applied at the instance level if required by your company standards.

💡 Tip: Use Revit's "Slope Arrow" tool or system routing settings to automate slope application during modeling.

When to Use This Rule

Enable this rule in models where:

  • Drainage, stormwater, or vent piping is modeled
  • Local codes require specific minimum slopes
  • QA/QC procedures enforce complete and accurate MEP data

If your workflow uses a different parameter to define slope (e.g., custom shared parameter), please let us know so DAQS can adjust the rule accordingly.