From performance in extreme Alberta winters to long-term value, fiberglass consistently outshines cellulose in real-world conditions. Let’s break down the differences so you can make an informed choice – and avoid costly surprises down the road.

One of the biggest issues with cellulose insulation is that it settles over time—meaning the R-value you paid for at install can drop significantly within a few years. That translates into heat loss, uneven coverage, and higher energy bills.

Blown fiberglass? It holds its loft. It stays full, fluffy, and effective—season after season.

Cellulose, on the other hand, is basically shredded newspaper. It soaks up moisture like a sponge, and that opens the door to mold, mildew, and rot in your attic structure.

Whereas cellulose needs to be treated with flame-retardant chemicals like borate to meet safety standards, but those treatments can break down over time – especially in humid or moist conditions.

Cellulose, on the other hand, is known for kicking up clouds of fine dust, which can linger long after the job’s done and be irritating to breathe.

Cellulose? It can shift over time, especially if the attic isn’t perfectly sealed. That leads to cold spots, reduced performance, and callbacks – which nobody wants.

While fiberglass won’t win any awards for being pest-proof, most critters don’t want to nest in it. It’s itchy, inorganic, and not exactly cozy.

Cellulose, being organic, can attract rodents or insects, especially if the borate treatments wear off.

Cellulose may seem cheaper upfront, but over time, it may need replenishing or replacement—driving up the true cost of insulation.

At Sorell, we don’t just install insulation – we install peace of mind. Blown fiberglass is cleaner, more durable, and better suited to Calgary’s climate. Whether you’re upgrading for comfort, energy savings, or resale value, it’s the smart choice.

Ready to upgrade your attic the right way?

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