Mold in a condominium or HOA-managed community creates a specific problem that single-family homeowners don't face: the moisture source that caused the mold may be entirely outside your unit, in a shared building system that is the association's responsibility — and proving that requires documentation the HOA's own contractor cannot provide.
In attached construction — condominiums, townhomes, stacked flats — moisture does not respect unit boundaries. A failed section of shared roofing allows water to travel down a party wall and appear in the unit below or beside it months after the source event. A plumbing stack shared between units develops a slow leak at a joint inside the shared wall cavity, depositing moisture into the framing that serves two or three units simultaneously. An HVAC unit on a shared roof develops a condensate overflow that runs into the ceiling plenum serving multiple units.
In all three cases, the mold appears inside an individual unit. But the moisture source is in a common element — shared roofing, shared plumbing, shared mechanical infrastructure — that the HOA is responsible for maintaining under California Civil Code 4775.
California Civil Code 4775 establishes the default maintenance responsibility framework for common interest developments. Unless the CC&Rs specify otherwise, the association is responsible for maintaining common areas — which includes the exterior of buildings, roofing, shared plumbing and electrical systems, and structural elements shared between units.
Individual owners are responsible for their own units — the interior space, fixtures, appliances, and any modifications they have made. The boundary between association responsibility and owner responsibility is defined by the CC&Rs, and in most California HOA communities that boundary runs at the unfinished surfaces of the shared walls, floors, and ceilings.
When mold appears in a unit and the moisture source is in a shared building system, the association is responsible for addressing the source and typically responsible for remediating the resulting damage — even though the damage appears inside the individual unit.
This is the question that determines financial responsibility, and it is a question that only an independent, instrument-based inspection can answer with the credibility needed in a dispute.
A plumber hired by the association to investigate a reported unit problem has a financial relationship with the association. A remediation contractor hired by the association to address visible mold has an interest in defining the scope as narrowly as possible. Neither can produce findings that the affected unit owner can reasonably treat as independent.
An independent mold inspection from a company with no remediation work to sell uses thermal imaging and moisture meters to trace the moisture pathway from the visible growth back to its source — through the wall assembly, through the ceiling, up to the roofing system, or into the shared plumbing chase. That documentation defines whether the source is inside the unit or in a common element, which is the only factual basis for the financial responsibility question.
When an HOA disputes responsibility — claiming the moisture originated inside the unit rather than in a common element — the dispute becomes a factual question about moisture pathways. CC&Rs that are ambiguous about the boundary between unit and common element don't resolve this question; the moisture pathway does.
A thermal imaging scan that shows the moisture traveling from a shared roof system down through the party wall into the unit is documentation that defines the pathway factually. Moisture meter readings that show elevated moisture content progressing from the shared wall toward the unit interior document the direction of travel. Laboratory air sampling that shows elevated spore counts consistent with the species found at the source location confirms the connection.
This documentation, produced by an independent company with no remediation stake, is what holds up in an HOA board meeting, in mediation, and in small claims or civil court. Documentation from a contractor hired by either side does not carry the same weight.
After the association performs remediation on a common element source and the resulting unit damage, an independent post-remediation clearance report serves both the association and the unit owner. For the association, it documents that the common element was repaired and the resulting mold was addressed — closing out the association's liability. For the unit owner, it confirms the remediation was effective and the unit is safe to reoccupy.
A clearance report from the same company that performed the remediation does not satisfy either party's need for independent confirmation. A clearance report from a company that performed no remediation — and has no financial relationship to the contractor that did — is the document that closes the matter.
If you are a unit owner with mold that may have originated in a shared building system, or an HOA board needing independent documentation to close a liability, schedule an independent inspection.
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