Mississauga (Erin Mills): animals had moved into the attic — full contamination cleanup and rebuild

1The Problem

Once wildlife gets into an attic, the damage doesn’t leave when the animal does. Droppings and urine soak into loose-fill insulation, nesting activity tunnels it flat, and the contamination sits directly above your bedrooms. Our inspection scored this attic 2 out of 5 for both pests and rodents.

2What the Inspection Found

Beyond the contamination, the attic was badly under-protected: barely 2–3 inches of old insulation where today’s standard calls for 21.5″, exhaust ducting running uninsulated over the attic floor, and three washroom vents that needed reconnecting so moisture would actually leave the house.

3How We Fixed It

Contaminated material can’t be topped up or spot-cleaned — it has to go:

• Removed and safely disposed of all 1,600 sq ft of contaminated insulation, right down to bare joists
• Applied our 3-stage treatment to the exposed wood — cleaning and spore removal, restoration, and a protective sealant
• Reconnected all three washroom vents so humid air exits the house
• Air-sealed every ceiling penetration with spray foam
• Installed 18 baffle vents with soffit cover-up and a new insulated hatch
• Blew in fresh fiberglass from bare joists to R-60

4The Result

A completely fresh start: the contamination is gone, the wood is treated and sealed, the moisture sources are rerouted, and the attic holds more than seven times the insulation it had. This is why we always recommend an inspection when you’ve heard scratching upstairs — what animals leave behind matters more than the animals themselves.

5The Short Version

An Erin Mills homeowner in Mississauga suspected something had been living in the attic, and the inspection confirmed it: animal droppings across multiple joist bays, fur, and tunneled nesting trenches through insulation that measured barely 2 inches. Once animals have been through it, insulation isn’t insulation anymore — it’s contamination. Confirmed Attics & Insulation removed and safely disposed of all 1,600 sq ft of contaminated material down to bare joists, applied a 3-stage treatment to the exposed wood — cleaning and spore removal, restoration, and a protective sealant — reconnected all three washroom vents so humid air exits the house, air-sealed every ceiling penetration with spray foam, and installed 18 baffle vents plus a new insulated hatch before blowing fresh fiberglass to R-60. A completely fresh start, at more than seven times the insulation the attic had. Completed June 2026; 10-year workmanship warranty.