Sprinkler Discharge in an Occupied Open-Plan Office

The scope is the wet and visibly affected zone plus any concealed areas that moisture mapping shows are wet. Do not assume the 600 sq ft visible zone is the full extent.

1. Delineate the work area. Use moisture mapping and infrared imaging to mark wet drywall, panels, and carpet. Include wall cavities where the drywall is wet at the base.
2. Isolate the zone. Build critical barriers from floor to ceiling and maintain negative pressure with HEPA-filtered exhaust. Verify pressure differential and smoke-test the barrier. Seal supply and return grilles in the work zone or isolate the HVAC zone to prevent migration.
3. Protect the occupied building. Schedule noisy or dusty work outside core hours where possible, post signs, and provide a clean route for workers. Keep employees out of the containment.
4. Remove contaminated porous materials. Cut out moldy drywall to sound material, bag it, and remove fabric panels that cannot be cleaned. HEPA-vacuum and clean retained surfaces.
5. Dry the assembly. If framing is wet, dry it before closing walls. Do not dry moldy drywall in place and then paint over it.
6. Verify before reoccupancy. Visual inspection, moisture verification, and independent clearance. Provide the tenant with the schedule and clearance report.

The lease obligation supports timely communication; it does not justify returning employees to a contaminated zone.

Drywall: Generally no for the moldy sections. Gypsum drywall has a paper facing that supports mold growth and loses strength when wet. Once visible growth is present, cutting out the affected drywall to sound material is the reliable approach. Drying in place may be considered only for wet but visibly clean drywall that can be dried quickly and verified; here the gray-green film indicates growth, so removal is appropriate. The wall cavity must then be cleaned and dried before new drywall is installed.

Fabric panels: HEPA vacuuming alone is usually not sufficient for porous fabric with visible or suspected growth. The fabric can trap spores and debris, and vacuuming may not remove growth from the backing or seams. Options are professional cleaning with a method validated for the fabric, or replacement. For a 600 sq ft zone with visible film, replacement is the more defensible choice, especially in an occupied office. If cleaning is attempted, test a small area, use HEPA vacuuming plus appropriate wet cleaning, and verify visually and by clearance. Document the decision and the rationale.

Give a written schedule with milestones and dependencies, not a single completion date. Explain that remediation cannot be compressed by skipping containment or drying.

• Interim occupancy: Keep employees out of the containment. If the work zone is adjacent to occupied desks, use barriers and negative pressure and schedule disruptive work after hours. If the building cannot maintain a habitable workspace, the tenant and property manager need to discuss temporary relocation; the remediator should state the constraint, not make the lease decision.
• Adjuster: Explain why moldy drywall and fabric panels are being removed rather than dried or vacuumed. Provide quantities, photos, moisture data, and the verification protocol. If the adjuster requests a cheaper method, document the technical reason it is not appropriate.
• Tenant: Provide the scope, daily work hours, barrier locations, expected noise and odor, and the clearance process. Give a single point of contact.
• Verification: Reoccupy only after visual inspection shows no visible mold or dust, moisture readings are normal, and the independent clearance report is accepted. If clearance fails, re-clean and re-test before employees return.

Do not promise a Monday reopening unless the schedule and drying/clearance results support it.