Open with the prevalence: roughly 1 in 4 Blaine attics built after 1995 show black staining on north-facing OSB roof sheathing. Explain the cause: tighter post-1995 building envelopes, bath fans terminating in attic instead of through roof, inadequate soffit-to-ridge ventilation,
Open with the prevalence: roughly 1 in 4 Blaine attics built after 1995 show black staining on north-facing OSB roof sheathing. Explain the cause: tighter post-1995 building envelopes, bath fans terminating in attic instead of through roof, inadequate soffit-to-ridge ventilation,
Open with the prevalence: roughly 1 in 4 Blaine attics built after 1995 show black staining on north-facing OSB roof sheathing. Explain the cause: tighter post-1995 building envelopes, bath fans terminating in attic instead of through roof, inadequate soffit-to-ridge ventilation, and Anoka County's humid summers. Map the most-affected neighborhoods (Lakes neighborhood, Lochness Park, TPC corridor, newer Centerville). Walk through identification: typical patterns, how to distinguish from dust or staining, when to sample. Cover the fix sequence: (1) fix the moisture source (re-route bath fans through roof, add soffit-to-ridge ventilation, seal attic bypasses), (2) remediate the staining ($1,500-$3,500 typical), (3) verify with post-remediation inspection. Show two sample annotated attic photos. Close with a CTA for mold inspection.
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