Vaughan (Maple): mold on the sheathing, treated and sealed before the R-60 rebuild

1The Problem

The staining across sections of the roof sheathing had passed the “early” stage. Warm, humid air from the house was leaking up through unsealed penetrations, hitting cold wood, and feeding growth. Blowing new insulation over that without treatment would have buried the problem — and voided nobody’s warranty but the homeowner’s comfort.

2What the Inspection Found

The source held no mystery: ceiling penetrations leaking house air, and an attic that couldn’t shed the moisture fast enough. The plan followed the cause — treat the wood, seal the leaks, restore the airflow, and only then insulate.

3How We Fixed It

Sequenced start to finish in one visit:

• Ran our mold treatment across the affected sheathing — cleaning, restoration, and protective sealant against regrowth
• Spray-foam sealed the ceiling penetrations feeding the moisture
• Baffled the soffit bays to restore drying airflow
• Blew fresh fiberglass across all 1,400 sq ft up to R-60

4The Result

The mold is treated and sealed against coming back, the moisture path is closed, and the insulation finally matches the size of the house. One visit, full photo record, 10-year workmanship warranty.