Attic Mold Removal in Cottage Grove, OR —
Sheathing Assessment, Borate Treatment & Vent Correction

The two most common causes of attic sheathing mold in Cottage Grove, OR are: (1) exhaust fans (bathroom, kitchen, sometimes dryer) terminating inside the attic rather than to the exterior — dumping moisture-laden air directly onto cold sheathing on every use cycle; and (2) inadequate soffit-to-ridge ventilation, typically from blocked eave bays (blown-in insulation burying soffit vent openings) or undersized or damaged ridge vent — reducing cross-flow and allowing warm moist air from below to condense on cold sheathing in winter. Secondary causes include roof leaks along eave edges from ice dams, damaged step flashing, or deteriorated boot seals around penetrations.

Not necessarily. OSB sheathing commonly contains sapstain organisms from the lumber mill — these blue-black fungi are present in the wood at installation and are not active mold growth requiring remediation. Sapstain persists regardless of the current moisture condition, doesn't pose the same air quality concerns as active mold, and costs homeowners significant money in unnecessary remediation when misidentified. We distinguish between sapstain and active mold using MC% readings (active mold requires elevated MC to persist; sapstain doesn't) and targeted lab sampling from suspected active areas before scoping any treatment.

In-place treatment is appropriate for structurally sound sheathing. Replacement is needed only for sections with confirmed structural compromise. We assess each section individually and recommend replacement only where structural assessment warrants it — not as a default that maximizes job size.

Our initial attic assessment traces every exhaust fan duct from its housing to its termination. Improperly terminated fans are identified and rerouting is specified in the remediation scope. You'll know definitively after our assessment whether fan termination is contributing to your Cottage Grove attic mold problem.

Our products are applied only to structural wood (sheathing, rafters) — not to the roofing material itself. We can provide SDS sheets for all products applied so you can verify with your roofing manufacturer. Most manufacturers have no restrictions on attic wood treatment by qualified contractors.