Mississauga: a full attic reset — removal, mold remediation, and a sealed rebuild to R-60

1The Problem

Underperforming insulation rarely announces itself — it just shows up as a furnace that runs constantly, a second floor that’s cold in winter and hot in July, and bills that creep up every year. By the time we opened the hatch, the insulation had settled to a fraction of its original depth.

2What the Inspection Found

The inspection turned up more than thin insulation. A washroom fan pipe was releasing humid bathroom air directly into the attic instead of outside — and years of that moisture had left mold growth on about 200 sq ft of the roof sheathing. The soffit intakes were blocked, so the attic had almost no airflow to dry itself out.

3How We Fixed It

We rebuilt this attic from the deck up:

• Removed all 1,000 sq ft of degraded insulation
• Ran the full 3-stage mold remediation on the affected sheathing — cleaning and spore removal, wood restoration, and a salt-based protective sealant
• Replaced the washroom fan pipe so moisture exhausts outdoors, never into the attic
• Air-sealed every ceiling penetration, then applied 2″ of closed-cell spray foam across the entire attic floor as a monolithic vapour barrier
• Installed 10 baffle vents with soffit cover-up to restore intake airflow
• Blew in fresh fiberglass from bare joists to R-60

4The Result

The house now holds its temperature, the moisture source is permanently rerouted, and the sheathing is clean, sealed, and protected against regrowth. A textbook example of why we inspect before we quote: the “insulation job” was really a moisture problem wearing an insulation costume. Backed by our 10-year warranty.

5The Short Version

A Mississauga homeowner booked a free attic inspection over rising energy bills and rooms that never held temperature. The thermal scan confirmed heat pouring through the ceiling — and the real problem sat above it: a disconnected bathroom exhaust duct had been dumping shower moisture into the attic, leaving roughly 200 sq ft of mold staining on the roof sheathing. Confirmed Attics & Insulation removed all 1,000 sq ft of degraded insulation, ran a 3-stage mold remediation on the affected wood, replaced the washroom fan pipe so moisture exhausts outdoors, air-sealed every ceiling penetration, and applied 2 inches of closed-cell spray foam across the attic floor as a monolithic vapour barrier. Ten baffle vents restored intake airflow before fresh fiberglass took the attic from bare joists to R-60. The house now holds its temperature. Completed May 2026; 10-year workmanship warranty.