Roofing & enclosure
Keeping a Leak Investigation Log for Steel Buildings
Record steel building water observations by location, weather, operating conditions, timing, and previous repairs before choosing a repair scope.
Define the condition and its scope
A leak log separates observed water from an assumed source or proposed repair.
A maintenance or retrofit decision needs an existing-condition baseline. Gather original drawings, later alterations, product information, previous leak or repair records, and the current use of the steel building. Cold-formed additions and red iron structures can both contain concealed changes that a roof photograph will not reveal. Distinguish observed symptoms from proposed causes. Give the investigating professionals the date, weather, operating conditions, and location of each observation before selecting a repair or writing a replacement scope.
References: Ongoing commissioning · Building enclosure commissioning process
Gather the inputs before deciding
Record each observation's location, time, weather, indoor operation, visible pattern, and prior repair history. Separate water entry, staining, damp insulation, and suspected condensation without assigning a cause prematurely. Ask the investigator what additional observations or tests would clarify the pattern. The interior location may differ from the exterior entry point. Avoid choosing repair materials before the actual condition and relevant assembly have been evaluated.
- Located interior observations
- Weather and operating conditions
- Timing and recurrence history
- Prior repair references
References: Ongoing commissioning · Building enclosure commissioning process
Set observable handoff deliverables
The interior drip location may not identify the exterior entry point or actual cause.
| Input | Evidence to keep with it | Review status |
|---|---|---|
| Located interior observations | Dated located observation log | Identify reviewer and written decision |
| Weather and operating conditions | Weather and indoor-condition record | Identify reviewer and written decision |
| Timing and recurrence history | Investigator findings and accepted scope | Identify reviewer and written decision |
Sequence review and release
Gather comparable observations across relevant events and give the investigator the complete log. Coordinate safe access and any accepted testing or opening-up. Locate findings and distinguish confirmed causes from remaining possibilities. Have the responsible team define the repair scope and temporary protection. After work, record follow-up under the agreed conditions. If symptoms recur, preserve the previous investigation rather than treating the latest observation as an unrelated new leak.
- Locate located interior observations in the current record.
- Compare weather and operating conditions with the table's evidence.
- Document the decision: Investigate the documented pattern before accepting a repair explanation.
Worked project coordination example
Water appears near a wall during some storms but also during humid operating periods. The owner logs both patterns, allowing the investigator to consider rain entry and condensation before recommending work.
Apply the stated release decision to the case: Investigate the documented pattern before accepting a repair explanation. The responsible team determines acceptance for the actual project and records any condition that still requires resolution.
Keep a closeout record another team can use
Link the observation log, investigation findings, accepted repair, installed products, and follow-up results by location. Explain what was investigated and what remained outside scope. Give the owner monitoring responsibilities where specified. A stopped drip on one day is not proof that every moisture mechanism was resolved. The record should support future diagnosis without converting an initial suspicion or a contractor's sales explanation into a confirmed cause.
For this issue, include investigator findings and accepted scope in the handoff. If review remains pending, identify the dependent work and its owner; do not present the record as a completed technical acceptance.
Common questions
Should every drip be sealed directly from above?
Do not assume the source; obtain a located investigation and accepted repair detail.
How should located interior observations be documented?
Investigate the documented pattern before accepting a repair explanation. Retain dated located observation log and check that the decision reached the team performing the dependent work.
Sources & further reading
Use the current documentation for the exact product and project. Source links do not imply a partnership or endorsement.
- Ongoing commissioning Whole Building Design Guide
- Building enclosure commissioning process National Institute of Building Sciences / WBDG
Prepared with AI assistance. Linked references require current project-specific review. How these guides are prepared.
Prepare a supply inquiry
- Record the project drawing or detail and the specified product, profile, or system.
- List the complete configuration, physical units, quantities, and cuts per piece.
- Request current manufacturer documents; confirm compatibility, price, and availability before ordering.
- Obtain the responsible professional's review for loads, code requirements, or installation.