Cellulose And Fibreglass Settle In Different Ways
Cellulose is shredded paper treated to resist fire. It is heavy, it packs down over time, and it soaks up water from any roof leak. Once it has been wet, it clumps and stays flat.
Loose fibreglass, often spelled fiberglass on product bags, is lighter and does not soak up water the same way. It still settles, and it gets blown around by wind coming in at the eaves. Both kinds collect droppings and nesting when mice move in. The vacuum handles both the same way, but cellulose fills bags faster because it weighs more.
Older attics often hold both, with a layer of cellulose blown over fibreglass during a top-up years later. The whole mix comes out in one pass, so there is no need to know exactly what is up there before you call.
How The Blown-In Insulation Removal Hose Works
The vacuum machine sits on a trailer in the driveway. A wide hose runs up the side of the house or through the house to the attic hatch, depending on where the hatch is. The fill is sucked up at the attic end, carried down the hose and dropped into large collection bags beside the machine.
The exhaust from the vacuum is outside, so fine dust does not blow back into the house. We seal around the hatch opening so the hose is the only way in or out. The full bags are closed on site and taken away for disposal.
Hose runs of 100 feet or more are normal, so a farmhouse set well back from the road near Springford or Mount Elgin, or a hatch in the middle of a bungalow, is not a problem. The trailer parks where it will not block your car or a neighbour's driveway.
Compressed Loose-Fill Holds Less Heat Than Its Depth Suggests
Packed insulation loses much of its value. A layer that started thick can settle to half its height, and the air pockets that slowed heat loss get squeezed out. Freeze-thaw winters make it worse, because frost on the underside of the roof drips back into the fill each time the weather warms.
If the fill is clean and dry, a top-up may be enough. If it is matted, stained or full of droppings, it has to come out so a new layer can start on a clean floor. The attic insulation replacement page covers what goes back in.
Blown-In Insulation Removal Leaves A Bare, Swept Attic
When the last of the fill is out, we vacuum the joist bays with the same hose to pick up what the first pass missed. You get photos of the empty attic so you can see the result for yourself. If droppings were mixed into the fill, the attic is sanitized before anything new goes in.