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The City of Portland, Oregon

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City of Portland

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29.30.120 Interior Dampness.

(Amended by Ordinance No. 189711, effective September 25, 2019.)  The Director will adopt administrative rules detailing implementation and enforcement of this provision.

A.  To prevent conditions conducive to decay, deterioration, or mold growth within a structure, every dwelling, including basements, attics, and crawl spaces, must be maintained reasonably free from dampness such that:

1.  There are no sources of moisture intrusion from either exterior or interior sources; and

2.  There is no visible or otherwise demonstrable growth of mold or mildew in the interior of any building.

B.  When visible or otherwise demonstrable growth of mold or mildew is found to exist within a residential unit, the property owner must remediate and treat the affected and identified areas in accordance with the requirements set forth in the administrative rules.

C.  When visible or otherwise demonstrable growth of mold or mildew exceeding a total of one square foot is present within a residential unit, an approved ventilation system for reducing moisture may be required for each bathroom with bathing facilities that does not have an approved mechanical ventilation system.  The new mechanical ventilation system must be installed and be sized to provide ventilation per the requirements of the Oregon Residential Specialty Code for one and two-family dwellings or the Oregon Mechanical Specialty Code for commercial structures.

D.  When visible or otherwise demonstrable growth of mold or mildew exceeding a total of one square foot is present within a residential unit, any existing, approved mechanical ventilation systems in bathrooms with bathing facilities must meet the requirements set forth in the administrative rules.  Any existing ventilation system that fails to meet these criteria and cannot be repaired or retrofitted must be replaced according to the specifications for new ventilation systems listed in Subsection 29.30.120 C.