VERT / GREEN
Locate every drain/overflow and keep them visible/accessibile.
Flat roof overflow, scupper and secondary drainage
Check primary drains, overflow scuppers, slopes, parapets, flashing and ponding load if a drain blocks.
JAUNE / YELLOW
An overflow is not decorative: it limits water depth and often signals a primary-drain problem.
ROUGE / RED
No secondary drainage, deep ponding, high parapet or unknown structure: roof/structural assessment.
Interactive triage
Helps choose the next step; does not replace design, permits or professional diagnosis.
Useful tools and data
- Drain/scupper plan
- Overflow elevations
- Structural plan
What the professional checks
- Verify drainage capacity
- Check ponding load
- Detail scupper/flashing
Official sources
Checked 2026-08-22.
Related path
Continue with the right tools
These links connect this page to the next useful checks and decisions without repeating the full content.
Start from a symptomOrganize plausible causes, observations, urgency and the right professional.Open →Track water useCompare meter readings and flag unusual changes.Open →Review water resilienceConnect flooding, drainage and future events to building adaptations.Open →Score home resiliencePrioritize water, outages, fire, climate, health and records.Open →Plan site, drainage and utilitiesCoordinate access, water, sewer, wells, septic, grading and site constraints.Open →
Tools related to this issue
Special check related to this project
V14
Systems to check before closing the work
V14 connects envelope, air, fire, structure, water and code instead of treating each project in isolation.
V15
Remaining system checks not to miss
V15 covers issues that can block a project, cause a loss or become expensive once concealed.
V16
Advanced diagnostics to cross-check
V16 connects water, soil, climate, safety, materials and seasonal use to existing projects.
V17
Specialized systems to cross-check
V17 completes gas, soil, water, fire, climate and structural interfaces.
V18
Specialized diagnostics to verify
V18 connects systems that become costly or regulated when a primary project triggers them.
V19
Edge systems to integrate into the project
V19 covers interfaces that become important when multiple home systems interact.
V26
Often-overlooked service interfaces
V26 connects systems that cross utility, plumbing, HVAC, envelope and metering boundaries.
V27
Project risks and overlooked interfaces
V27 connects payment, water, envelope, ventilation and jobsite details that often create costly surprises.
V28
Finish and service details to verify
V28 connects small details that become costly once finishes are closed.
V30
Shared, access and specialized interfaces
V30 connects projects where multiple systems, owners or rules meet.
V32
Post-disaster and legacy systems
V32 connects contamination, storm damage, legacy materials and recommissioning before rebuilding.
V47
V47 interfaces not to miss
These details are small on a drawing but can control water, structure or durability.