A Landlord's Clean-and-Seal Request, a Tenant With Asthma, and a Request for Self-Clearance
A 24-unit apartment building. The tenant in 4B reports musty odor and worsening asthma. Before you arrive, maintenance sprayed a hardware-store mold killer on the bathroom ceiling and applied two coats of stain-blocking primer. Your inspection finds: the bathroom exhaust fan discharges into the attic rather than outdoors; ceiling drywall above the shower reads 18 percent WME; the cavity behind the tub surround reads 24-31 percent from a failed shower pan and backer; there is visible growth on 2x4 studs and on the back of the removed drywall; and the carpet outside the bathroom door is damp at the tack strip. The property manager wants a written proposal to clean and seal the bathroom ceiling for under $1,500, states that the tenant has no medical documentation, and says the landlord does not want the tenant told the extent of the problem. The manager also asks whether you can run the clearance samples since you are already certified, to save money.
1. Define a defensible scope for unit 4B. What must not be accepted?
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The clean-and-seal proposal fails on both counts: it does not remove the reservoir, and it does not fix the water.
Scope:
- Open the wall and remove the tub surround, the failed backer, the wet drywall, and any wet insulation. Remove and rebuild the shower pan with a proper preslope, liner, and cement backer.
- Structurally dry the framing to roughly 16 percent MC or within 2 points of a dry standard taken from unaffected lumber in the same unit.
- HEPA vacuum all surfaces, wire-brush the visible growth, HEPA vacuum again, and apply a coating or antimicrobial only after the material is clean and dry.
- Re-duct the exhaust fan to the exterior with a proper termination, a correctly sized fan, and a timer, and verify airflow. Venting into the attic is the root cause of the chronic bathroom humidity; without fixing it the same condition returns.
- Inspect the damp carpet and tack strip. If the pad or carpet is contaminated, remove and replace the affected area rather than drying in place; padding cannot be cleaned.
Do not accept: primer over active growth, a coating on wet gypsum, a partial scope that leaves the cavity at 24-31 percent, or a price that only makes sense if the exhaust is ignored. Present the full scope and price it, then let the owner decide. Do not submit a proposal whose scope you know cannot produce a clean, dry result.
2. How do you handle the request to keep the extent from the tenant, and the request to run your own clearance sampling?
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Clearance: decline. Performing post-remediation verification on your own work is a conflict of interest. Offer the alternative: an independent assessor performs verification, and you supply an internal self-check with photos, moisture readings, and a signed visual statement clearly labeled as not a clearance. That protects the owner, the tenant, and you.
Disclosure: your contract may be with the owner, but the occupant is directly affected, and in many jurisdictions there are disclosure duties for conditions that affect habitability. You are not the lawyer; get direction in writing and tell the manager that concealing a known condition from a tenant who has already complained is a risk to the owner and to you. Encourage them to notify the tenant and to provide the factual report. Keep your own communication factual and limited: observed conditions, moisture readings, recommended scope, and verification status. Do not discuss the tenant's medical history, do not say the asthma is or is not related to the building, and do not speculate about anyone's health. If the owner insists on concealment, document the request and your response in the project file and consider declining the job.
3. What goes in the written report and proposal to protect both parties?
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The report should be a dated narrative with photos and instrument readings that stands on its own if it is read a year later by someone who was not there.
Contents:
- Observed conditions, quantified: 18 percent WME on the ceiling drywall against a stated dry standard, 24-31 percent in the tub-surround cavity, visible growth on studs and the back of the drywall, exhaust terminating in the attic, damp carpet at the tack strip.
- Prior work by others: the applied product and primer, and the fact that they do not constitute remediation.
- What was not investigated and why (for example, no destructive access without owner permission), and what remains unknown.
- Recommended scope, option pricing, and schedule, with a clear statement that the exhaust correction is not optional if the condition is to stay corrected.
- Post-remediation criteria and who will verify: visual, moisture, and independent PRV.
- Limitations: no medical opinion, no clearance authority, and no warranty on concealed conditions.
Use neutral, standard terminology and avoid alarmist language. Send a copy to the person who hired you, keep a complete file copy, and note any requests you declined and why. A well-documented report is your best defense and the tenant's best information.