Settled Attic Insulation Cannot Be Fixed By Adding More On Top
Attic insulation removal is the fix when the layer up there is flattened, dirty or wet. Insulation works by trapping still air. Once it packs down, gets walked on or soaks up water, most of that trapped air is gone and the R-value goes with it.
Topping up over a bad layer buries the problem. Droppings, mould and smells stay in the attic, and the new insulation sits on something that is already failing. We tell you plainly when a top-up is enough and when the old material has to come out first.
About two thirds of London homes were built in 1990 or earlier, so a great many attics in the city still hold their first layer of insulation.
Loose Blown-In Insulation Needs A Powerful Vacuum To Come Out
Blown-in insulation removal calls for a big truck-mounted or trailer vacuum rather than shovels and garbage bags. Loose cellulose and fibreglass work their way into every corner, slide under wiring and heap up at the eaves where the roof sits lowest.
A long hose runs from the machine outside up into the attic. The material is pulled out from between the joists and blown straight into large bags that sit in the yard or on the driveway, so none of it is carried through the house.
The hose reaches the tight spots at the edges of the attic that are hard to clear by hand. When the job is done, the attic floor is down to bare joists and drywall.
Droppings In Attic Insulation Should Never Be Swept Up Dry
Attic cleaning and decontamination removes mouse, squirrel, raccoon and bat droppings along with the insulation they sit in. Public health advice is to never sweep up or vacuum dry droppings, since the dust they give off can carry disease.
A removal crew takes a different approach. Everything is misted or treated before it is disturbed, respirators go on before anyone reaches the droppings, and the vacuum's exhaust air is let out in the yard beside the bags. Once the insulation is out, the joists and drywall are disinfected and the smell is treated.
Bats call for extra care around here. The Middlesex-London Health Unit found that all 11 animals that tested positive for rabies from 2014 to 2018 were bats. If anyone in the house has touched a bat, call the health unit before anything else.
Ice Dams Leave Wet Insulation Behind At The Eaves
Wet, mouldy and smoke-damaged insulation removal takes out insulation that water or fire has ruined. In a London winter, the usual cause is an ice dam. Warmth from the house slips into the attic and thaws the lower layer of roof snow, that meltwater refreezes along the overhang, and the next thaw pushes water sideways beneath the shingles.
London sits on the edge of the Lake Huron snowbelt and gets about 76 inches of snow a year, so there is plenty on the roof to feed an ice dam. The water drips into the insulation at the eaves, where it is hardest to spot.
Wet insulation does not dry well in an attic. It stays heavy, holds little heat and can start mould growing on the roof boards above it.
Smoke From A House Fire Stays Trapped In Attic Insulation
Smoke-damaged insulation removal is often needed even when the fire never reached the attic. Smoke rises through the ceiling, and loose insulation catches the soot and the smell like a filter. Painting the rooms below will not stop the smell while the attic still holds it.
We vacuum out the smoke-damaged insulation and take pictures at each stage of the job. Those photos help when an adjuster asks what was there. No one can say ahead of time what a policy will pay, since that is between you and your insurer, but the paperwork is ready if they ask for it.
New insulation goes in only after the soot and the odour have been cleared.
Vermiculite Insulation Removal Starts With A Lab Test
Vermiculite insulation removal is never started on a guess. Vermiculite is a light, pebble-like fill, usually grey-brown or with a silver or gold shine, found in some older Canadian homes, and it may contain asbestos. Health Canada's guidance is not to disturb it at all, and to call in professionals when removal cannot be avoided.
When we find it, work in the attic stops. A sample goes off to a proper lab and nothing moves until the result is back. A positive result means the job belongs to a trained asbestos abatement contractor working under Ontario's asbestos rules, and we line that contractor up for you.
After the air test clears the attic, we return to seal the gaps and fill it with new insulation.
An Empty Attic Is The Best Time To Air Seal And Re-Insulate
Attic insulation replacement finishes the job after insulation removal. With the old layer gone, every gap around wires, pipes, light boxes and the hatch is easy to see and seal. Once new insulation covers the attic floor, those gaps are buried again for decades.
Every gap gets sealed, eave baffles are set so outside air can flow from the soffits up to the roof vents, and new insulation is built up to R-50 or R-60. Ontario asks for that level in new homes today.
The City of London's BetterHomes London program offers low-interest loans for insulation upgrades, repaid on the property tax bill while the funds last. Check the current terms with the city before you plan around it.
Century Houses Often Need Insulation Removal Before They Are Rewired
Rewiring an older house very often begins with insulation removal. Many century houses in Old East Village, Woodfield and Wortley Village still have knob-and-tube wiring running through the attic, buried under mixed layers of old fill.
Electricians usually want that wiring checked, and they often want the attic cleared so they can see and reach it. It is common practice to take out the old insulation first, let the electrician do the work, and then air seal and re-insulate.
We can plan the work around the electrician's schedule so the attic is empty when they arrive. Attics in these houses can also hide vermiculite, so we look for it before any hose goes in.
Rental Houses Near The Colleges Collect Attic Problems Between Tenants
Attic cleanups are a common job in rental houses near Western University and Fanshawe College. Student rentals turn over often, hatches get left open, and mice, squirrels and raccoons move in while nobody is watching the attic.
London requires property standards and fire inspections before many smaller rental houses can be rented. A landlord who finds droppings or damaged insulation at a turnover usually wants it cleaned up before the next inspection or the next lease.
We can schedule the work between tenants and send the photos and the invoice straight to the owner or the property manager. Rental owners get the same written quote as any homeowner.
Insulation Removal Prices Depend On Size, Depth And Contamination
Across London and the surrounding county, the going rate for insulation removal is roughly $1.50 to $3.50 a square foot, with the bulk of jobs priced from $1.50 to $2.50. A clean 1,000 square foot attic usually lands somewhere near $1,500 to $3,000. These are market ranges, not a price list.
Dirty insulation costs more to clear. Where there are droppings, mould or water, prices tend to begin near $2.50 a square foot and often total $2,000 to $3,500 for a 1,000 square foot attic, because the work is slower and the attic has to be sanitized.
A combined job, with the old layer out and new fill blown in, tends to cost around $3.50 to $7.00 a square foot. Hatch size, headroom, the length of the hose run and disposal fees all shift the number, which is why only a written quote settles it.
Home Inspections Often Flag Attic Insulation In Older Houses
Pre-sale and home inspection insulation removal helps buyers and sellers deal with an attic problem before closing. Home inspectors often flag droppings, wet or mouldy insulation, very thin coverage or possible vermiculite.
London's resale market has been slower in 2026, with more houses for sale and buyers taking their time. In that kind of market, a clean inspection report counts, and an attic problem left open gives a buyer a reason to walk away or ask for a lower price.
We turn written quotes around quickly so they can go into a negotiation, and we supply a before and after photo report once the work is done.
Want A Written Insulation Removal Quote?
Phone +1 (226) 400-3320 to arrange a free attic visit, or fill in the form on the contact page. We measure, check what is up there and send a written insulation removal quote you can hold up against any other.