Certified Attic & Crawlspace Mold Remediation in Portland

Remediation of fungal growth in confined, unconditioned spaces like attics and crawlspaces in Portland presents unique challenges governed by building science principles and IICRC S520 standards. Our process begins with establishing critical barriers to isolate the contaminated area from the main building envelope. For crawlspaces, this involves sealing foundation vents and access points; for attics, we seal the scuttle hole or access hatch. A negative air machine with a HEPA filter is then deployed to depressurize the workspace, exhausting filtered air to the exterior and preventing spore migration. The primary driver of mold in these areas is inadequate ventilation and condensation, often exacerbated by improperly vented bathroom fans or insufficient soffit-to-ridge airflow, leading to elevated relative humidity and moisture content in wood framing above the dew point. Our technicians use moisture meters to map saturation levels in trusses, rafters, and subfloor joists. Contaminated insulation (fiberglass, cellulose) is removed, bagged, and disposed of as per Oregon DEQ guidelines. The exposed structural wood is then subjected to a multi-step cleaning process. We begin with HEPA vacuuming to remove loose spores, followed by abrasive media blasting (typically using dry ice or soda blasting) to physically remove the hyphae and staining from the wood substrate. This method is superior to chemical washing as it effectively removes the mold structure without saturating the wood. Post-blasting, a final HEPA vacuuming is performed before applying an EPA-registered fungicidal coating with a stain blocker. This treatment makes the wood surfaces more resistant to future moisture absorption and fungal growth. Finally, we provide recommendations for correcting the underlying ventilation or moisture issues, such as installing baffles, improving soffit ventilation, or encapsulating the crawlspace to comply with Oregon Residential Specialty Code.