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Attic Mold Removal in Toronto

Attic Mold Removal in Toronto

Attics can be a treacherous area of the home to navigate by the homeowner.

  • It is incredibly dirty and dusty and can have you coughing in seconds.
  • One misstep and you could put a foot through the ceiling or worse fall through.
  • The insulation can cover nails protruding upward.
  • The underside of the roof is full of protruding nails that are holding the shingles on.

For these reasons many homeowners never venture into the attic unless there is a problem. The problem could be a roof leak or mold has been found by a contractor installing a new bathroom fan or pot lights, a home inspector has found a mold problem during a real estate transaction.

While no one likes to hear the word Mold it’s not the end of the world, it can send many potential Toronto home buyers running until they get educated about Attic Mold, it’s fixable and not a deal breaker by itself.

Some Common questions

  • How did the mold get in my Attic?
  • What is involved in removing it?

This is the Mold Equation

Moisture + Food (building materials) + Mold Spores = Mold Growth

Mold growth will occur in 12 – 48hrs when the equation is complete. Mold Spores are everywhere in nature and our homes are built with wood and drywall (food) so the only part of the equation we can control is the moisture.



There are 5 typical causes for Attic Mold

  • Lack of insulation this allows heat to escape into the attic, then it condensates on the cold roof.
  • Venting into the Attic of bathroom or laundry room exhaust fans which put moisture into the attic.
  • A Leak in the Roof which usually isn’t seen until it’s dripping through the ceiling.
  • Blocked soffit vents do not allow the required air flow into the attic, typically caused by too much insulation.
  • Too few roof vents that don’t allow the hot humid air out fast enough.

How do we get the attic mold out?
Go to Google and find a company that does mold removal…right? Well…You get the first 3 companies on Google and they come to inspect but they all have different methods of mold removal and completely different costing quotes, NOW WHAT?

There are 5 typical ways to Remove Mold from the Attic

Assume a typical 20’ x 30’ attic

  • Replace the roof, the majority of the mold is on the roof sheathing
  • Soda Blasting, high pressure soda blasts the mold off
  • Dry Ice Blasting, same process as soda blasting using dry ice
  • Chemical washing, uses chemicals to kill and remove the mold

……………..See Before and After Pictures

More About Attics….Insulation

Let’s have a brief look at four common types of insulation that might be in your attic.

  • Fiberglass batt Insulation with and without a backing
  • Blown in Fiberglass insulation
  • Blown in Cellulose insulation
  • Poured Vermiculite insulation
  • There is a sprayed foam but rarely seen

Fiberglass Batt:
One of the most common types of attic insulation are fiberglass batts, made of long, interwoven fibers of fibreglass with some adhesive binders. Batts come in panels or rolls while batts are easy to install they tend to leave spaces or gaps which affects the R value performance.

(R-Value = Thermal Resistance)

Some fibreglass batts come with a backing made of kraft paper or vinyl which acts as a vapour barrier, it’s best to use the batts without a backing in the attic.

Cost is typically around $1.25 per square foot.

The only down side to blown in fiberglass is the experience of the installers, if the installer doesn’t install some sort of baffle near the soffits to prevent the insulation from falling into the soffit vent area they could inadvertently block the soffit vents causing poor circulation throughout the attic. This is one of the primary causes of mold growth in the attic.

Blown in Cellulose:
Cellulose is 75% recycled newspapers, 25% natural wood products with a fire-retardant chemical so it has a fire rating and is safe. Considered a green product, it’s not itchy like fibreglass and doesn’t contain any formaldehyde. Both Fiberglass and Cellulose have similar R-Values and there is the possibility that the soffits could get blocked if not installed correctly.

Poured Vermiculite:
Vermiculite is a silver-gold to gray-brown mineral that is flat and shiny in its natural state. When heated to around 1000 degrees C, it pops or puffs up which creates pockets of air which made it suitable for use as attic insulation. Vermiculite has not been shown to cause health problems itself. However there was a mine in Montana called Libby Mines which had a natural deposit of asbestos which resulted in the vermiculite being contaminated with asbestos. The product hasn’t been for sale since 1990. It was sold as Zonolite Attic Insulation.

Not all vermiculite has asbestos, only the product that came from the Libby Mine. Most vermiculite products are safe. When we open an attic during a house or mold inspection and we see vermiculite it’s best to have it analyzed for possible asbestos contamination.

  • Do not use the attic for storage.
  • Nobody should go into the attic.
  • If you plan to renovate, get a certified asbestos abatement company in first.
  • Never remove the insulation yourself.
  • Seal all cracks and holes in the ceilings to prevent insulation from sifting through.

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