Photograph inside/outside and trace water marks upslope.
Home system
Roof penetrations, flashing and leak diagnosis
Coordinate chimney, vent, skylight, valley, wall and flashing with the roof covering instead of patching only where water appears.
Checked: 2026-08-21
A visible leak can start higher up; check flashing, membranes, joints and attic condensation.
Slippery/high roof, chimney, rotten wood or active leak near electricity: secure and use a professional.
Useful tools and measurements
- Binoculars / ground-based inspection
- Light and moisture meter in attic
- Photos after rain/snow
- Map of penetrations and slopes
Having a tool does not make regulated work DIY.
What the professional checks
- Identify actual entry point and water path
- Rebuild flashing/membranes for the roof system
- Check deck, ventilation and concealed damage
Sources and limits
Requirements vary with the building, jurisdiction, code edition and exact scope. This triage does not replace plans, calculations, permits, inspections or required professionals.
Related path
Continue with the right tools
These links connect this page to the next useful checks and decisions without repeating the full content.
Connect symptoms to the enclosureStart from condensation, staining, odours or movement before choosing a repair.Open →Adapt the enclosure to climateConnect heat, cold, water, wind and wildfire to building priorities.Open →Assess overall resilienceReview water, climate, safety, autonomy and records with a local score.Open →Screen hazardous materialsIdentify situations where work should stop and testing is needed before disturbance.Open →Open climate guidanceReview climate constraints relevant to assemblies and materials.Open →
Tools related to this issue
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.