Scarborough (Cliffside): dead airflow left mold staining across virtually the entire roof deck

1The Problem

This attic had essentially no air movement. Our ventilation rating came in at 2 out of 5: the soffit intakes were blocked, and decades of debris — old wrappers, plastic sheeting, shingle scraps — sat embedded in the original wool insulation. Every winter, warm humid house air rose into the attic and had nowhere to go.

2What the Inspection Found

The consequence of dead airflow was written across the wood: mold and moisture staining over virtually the entire roof deck, heaviest at the blocked eaves where condensation had been collecting for years. The insulation itself was a shallow, uneven patchwork, and the attic hatch was uninsulated and leaking warm air — feeding the cycle.

3How We Fixed It

The fix had to solve the airflow problem, not just the insulation number:

• Removed all 1,008 sq ft of old insulation and debris for clean access to the deck
• Completed the 3-stage mold remediation across the sheathing — cleaning and spore removal, wood restoration, protective sealant
• Air-sealed the ceiling penetrations below
• Rebuilt the intake path with 20 baffle vents and soffit cover-up
• Installed two solar-powered attic fans to keep air actively moving year-round — at zero operating cost
• Upgraded the hatch with our insulated hatch solution and blew the attic back to R-60

4The Result

The attic now breathes: fresh air enters at the soffits, the solar fans exhaust it at the roof, and the remediated deck stays dry. With R-60 above the ceiling, the house is warmer in winter, cooler in summer, and protected by our 10-year workmanship warranty.

5The Short Version

A 1950s bungalow in Scarborough’s Cliffside neighbourhood had about 8 inches of older insulation — a passable number hiding a failing attic. Dead airflow had left mold staining across virtually the entire roof deck, with white frost bloom on the framing from years of trapped moisture. Confirmed Attics & Insulation removed all 1,008 sq ft of old insulation and embedded debris, completed a 3-stage mold remediation across the sheathing, air-sealed the ceiling penetrations, and rebuilt the intake path with 20 baffle vents and soffit cover-up. Two solar-powered attic fans now keep air actively moving year-round at zero operating cost, and the attic was blown back to R-60 with an insulated hatch upgrade. Fresh air enters at the soffits, the fans exhaust it at the roof, and the remediated deck stays dry. Completed May 2026; 10-year workmanship warranty.