Toronto (Clanton Park): a nearly-bare attic with black mold overhead — a mid-winter full rebuild
In the coldest month of the year, this North York homeowner was heating the sky: 1,500 sq ft of attic with effectively no insulation at all, and a roof deck that told the story of years of escaping warm, humid air.
1The Problem
This was one of the barest attics we’ve worked on — joists and dust where two feet of insulation should be. All that escaping heat carried moisture with it, and the roof sheathing above was blanketed in black mold.
2What the Inspection Found
The inspection mapped where all that moisture was coming from: unsealed penetrations letting house air pour into the attic, bathroom exhaust ducting that wasn’t insulated (so it dripped condensation), and a washroom vent that needed properly reconnecting. About 250 sq ft of sheathing needed full mold remediation.
3How We Fixed It
Cold weather doesn’t pause mold — so we didn’t wait for spring:
- Cleared and prepped the full 1,500 sq ft deck
- Completed the 3-stage mold remediation on 250 sq ft of sheathing — cleaning and spore removal, wood restoration, protective sealant
- Air-sealed the ceiling penetrations, including the plumbing stack
- Insulated both bathroom vent pipes and reconnected the washroom vent so steam exits through the roof
- Installed baffle vents with soffit cover-up
- Blew in fresh fiberglass from zero to R-60
4The Result
From heating the sky to holding heat: a bare attic went to a full R-60 blanket in the middle of February, with the mold remediated at its source. The furnace finally got to take a break.
Wondering what’s going on in your attic?
Every problem on this page was found during a free, no-obligation inspection. We photograph everything, walk you through it, and give you a straight answer — even if that answer is “your attic is fine.”
About Confirmed
Confirmed Attics & Insulation specializes in insulation and energy-efficiency solutions for homes across Ontario. We help homeowners improve comfort, reduce heat loss, and lower energy costs through expert attic insulation, air sealing, and efficiency upgrades.
Contact Info
- (647) 507-4072
- info@confirmedc.com
- 2600 John Street Unit #208, Markham, ON
- Mon–Sat: 9:00 AM – 5:00 PM