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Fibreglass Insulation In Cellar

1. Ruined by water and moisture

Much like a sponge, fibreglass absorbs water and humidity. As a result, it can become saturated with moisture via basement flooding, water leaking through walls, or simply from the high humidity levels that occur in this below-grade space.

2. Sagging and falling down

Wet fibreglass loses nearly all of its insulating value. Adding moisture to fibreglass transforms a light, fluffy material into a heavy material that sags, compresses and often falls out of place. Fibreglass batt insulation installed between ceiling joists in a cellar or basement often ends up on the floor if it gets wet.

3. Supports mould growth

It’s not rocket science to figure out that before too long, wet fibreglass is going to encourage mould and mildew growth, which is very bad news for your health. Mold growth that originates in fibreglass insulation can eventually lead to wood rot in nearby structural lumber, which can threaten the building’s structural integrity.

4. Air circulation

Fibreglass insulation can’t stop air circulation. So the insulation does nothing to stop air leaks that occur around cellar windows and around the perimeter of the cellar or basement. Fibreglass insulation does nothing to stop cold, damp air from leaking into the basement and up into the living space above.

5. Compression and settling

Over time, fibreglass insulation can settle and/or compress. This significantly reduces its insulating effectiveness (referred to as ‘R-value,’ for Resistance to heat transfer). In older fibreglass insulation, the R-value will drop as the insulation settles or compacts. Whether installed in wood-framed walls or between joists, fibreglass batts compress easily and are prone to falling out of place. This not only creates a mess; it also renders the insulation all but useless.