First 24 Hours Leak-Response Checklist

A Building Enclosure Professional’s Guide for Property & Facility Managers

As a follow-up to some of our earlier articles on water infiltration and the high-profile losses that can come with it, we have created this helpful guide for managers.

When water infiltration is discovered, the first 24 hours are often critical. Quick, coordinated action can prevent structural damage, mold amplification, tenant disruption, and insurance complications. Use the checklist below as a framework for operational incident response.

1. Ensure Immediate Life Safety
   • ✔️Verify the area is safe to access.
     • Check for electrical hazards, slipping hazards, ceiling instability, or saturated fixtures.
   • ✔️Shut down power to affected circuits if water is near electrical equipment.
   • ✔️Relocate occupants from impacted areas until the space is stabilized.
2. Stop or Contain the Water Source (If Possible)
   • ✔️Identify where water is entering.
     • Look for active dripping, stained ceiling tiles, wet walls, or floor pooling.
   • ✔️If weather-related, verify roof drains, scuppers, and gutters are not blocked.
     • In heavy storms, clearing drainage makes a major difference.
   • ✔️If mechanical-related, shut down leaking mechanical equipment or piping runs.
   • ✔️Deploy containment: buckets, tarps, absorbent pads, or temporary piping to divert water.
3. Document the Condition Thoroughly
   (This step is essential for insurance, technical evaluation, and contractor coordination.)
   • ✔️Photograph and video everything—entry points, wet materials, mechanical contributors, and water paths.
   • ✔️Capture wide shots showing context and close-ups showing damage.
   • ✔️Record the time and weather conditions (rain, wind, freeze/thaw, snowmelt, etc.).
   • ✔️Log which tenants or spaces were impacted and whether operations were affected.
4. Protect Assets and Building Materials
   • ✔️Move equipment, inventory, or sensitive materials away from the leak area.
   • ✔️Cover vulnerable items with plastic sheeting.
   • ✔️Remove or prop up furniture and carpets to prevent moisture wicking.
   • ✔️Switch ceiling tiles:
     • Remove saturated tiles that may collapse.
     • Replace with temporary open space to monitor leaks above the ceiling.
5. Start Controlled Drying and Stabilization
   • ✔️Extract standing water.
     • Wet vacuums, pumps, or contractor-led water extraction.
   • ✔️Deploy air movers or fans, but avoid blowing air directly into wall cavities (can spread moisture).
   • ✔️Increase ventilation if exterior weather allows.
   • ✔️Use dehumidifiers immediately in warm months and in conditioned spaces.
6. Notify Your Key Stakeholders Early
   • ✔️Internal team (facility director, building engineer, asset manager).
   • ✔️Impacted tenants or occupants—be clear, calm, and factual.
   • ✔️Your insurance carrier or broker—early notice avoids denied claims.
   • ✔️Your on-call roofing contractor, waterproofing contractor, or engineer.
7. Determine the Suspected Failure Mode
   You cannot diagnose everything in 24 hours, but you can categorize the leak to guide the next steps:
   • ✔️Roof system – membrane breach, flashing failure, clogged drains, wind-driven rain.
   • ✔️Facade system – failed sealants, cracked masonry, deteriorated mortar, window leakage.
   • ✔️Below-grade/plaza system – drainage issues, membrane failure, hydrostatic pressure.
   • ✔️Mechanical system – HVAC condensation, piping leak, equipment overflow.
   • ✔️Interior plumbing – domestic water or sanitary line leaks.
     • This preliminary categorization informs who you call and what access is needed.
8. Preserve Evidence for Insurance + Technical Review
   • ✔️Do not discard wet materials immediately unless unsafe—insurers often require inspection.
   • ✔️Keep samples of saturated materials (ceiling tiles, insulation, etc.) if applicable.
   • ✔️Maintain a written log of:
     • When the leak was discovered
     • Who responded
     • What steps were taken
     • The estimated timeline of events
   • Documentation is often the deciding factor between full and partial coverage.
9. Engage Qualified Professionals Quickly
   Within the first 24 hours, line up the right expertise depending on the leak type:
   • ✔️Roofing contractor for active roof leaks.
   • ✔️Building envelope consultant or engineer for roofs, façade, windows, plaza, or unclear sources.
   • ✔️Mechanical contractor for interior equipment or piping leaks.
   • ✔️Restoration contractor for water extraction, drying, and material removal.
   • Early expert involvement prevents future failures and ensures accurate diagnosis—not just symptom treatment.
10. Plan the Next 24–72 Hours
    • ✔️Schedule a formal inspection of the roof, façade, or mechanical system.
    • ✔️Identify whether a destructive investigation (opening walls/ceilings) is required.
    • ✔️Prepare for moisture mapping or infrared scanning if needed.
    • ✔️Assess whether temporary repairs (tarps, sealants, drain clearing) are sufficient until permanent work can proceed.
    • ✔️Evaluate tenant communication needs for ongoing disruption.

Kevin M. Duffy P.E.

Principal

Duffy Engineering