Cal. Civ. Code § 186
Extension roofs
Operative Text
§ 186. Extension roofs. The under-surface of the roof of any extension shall be fire-retarded or sprinklered unless such ceiling has already been plastered in a manner satisfactory to the department.
Under N.Y. Mult. Dwell. Law § 186, the underside of any extension roof in a multiple dwelling must meet one of three conditions: it must be treated with fire-retardant materials, covered by a sprinkler system, or already finished with plaster in a way the relevant department considers satisfactory. The rule is aimed at limiting fire spread through extension roof surfaces. All three approaches are treated as equivalent paths to compliance.
Plain English — not legal advice.
Property owners and managers overseeing multiple dwellings with extensions should verify that the under-surface of each extension roof satisfies one of the compliance paths recognized under N.Y. Mult. Dwell. Law § 186 — fire-retardant treatment, sprinkler coverage, or department-approved plastering. Operators generally document the method used and retain any departmental approvals related to existing plaster finishes. When planning renovations or additions that include extensions, confirming the chosen ceiling treatment meets current departmental standards before construction is complete is a common practice among compliant operators.
General guidance for property managers — not legal advice for your specific situation. Consult an attorney for advice on your case.
N.Y. Mult. Dwell. Law § 186 establishes a fire-safety requirement for extension roof undersurfaces in multiple dwellings, and tenants living in units near or beneath such extensions have an interest in knowing this standard exists. If a tenant believes an extension roof in their building lacks any of the required fire-retardant, sprinkler, or approved plaster treatments, they may consider raising the issue with the local housing or buildings department, which has authority to inspect and enforce compliance. Tenant-rights organizations can help residents understand how to document concerns and what enforcement or complaint processes may be available.
General guidance for tenants — not legal advice for your specific situation. Consult a tenant-rights organization or attorney for advice on your case.
Generated September 13, 2026 — auto-generated, not yet human-reviewed. See /transparency for methodology.
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