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When Is Fibreglass Insulation The Right Choice To Make?

April 01, 2017

Still one of the more popular choices for home insulation, fibreglass insulation has proven itself effective in both new construction and reinstallations. The product is available in pre-cut batts, blankets, and loose-fill composition. And while many insulation products are competing in the marketplace today, fibreglass insulation offers specific benefits and advantages, depending on the application. What's most important is to get professional input on both product and installation.

Labeled R- Values

Fibreglass insulation products are labeled according to R-Value. Based on various test standards, the installed product is manufactured to retain thermal performance for the life of the product. Importantly, this product must be professionally installed, so that significant sagging/settling is avoided. A professional installation will ensure that the advertised R-Value will be maintained.

Ideal in the Attic

In attics and roof cavities, fibreglass insulation (both batts and loose-fill) can provide satisfactory R-Value. Thermal performance is comparable with other product installations, and R-Values can be achieved or exceeded when expertly installed. Available in different densities, a well-installed fibreglass application can be easily customized to provide varying R-Values depending on need.

Air Leakage Effect

When it comes to wall assemblies, fibreglass insulation suffers in thermal performance because air can move through the assembly. In Canada, the National Building Code requires that an air barrier be installed when insulating with fibreglass. This will control air leakage in and out of the building envelope, which will ensure better performance for the installed thermal insulation.

Fire Retardant

Fibreglass insulation products are made primarily of material that is non-combustible. The glass fibres won't burn and therefore require no additional fire-retardant chemicals. For the most part, fibreglass batts and loose-fill insulation products are listed as non-combustible, and remain this way for the life of the product. This is a particularly important feature in the attic and roof.

Moisture Exposure

Fibreglass insulation is inherently non-absorbent - it means that moisture stays on the surface of the material and does not penetrate. If there is exposure to moisture vapour, the water droplets either evaporate or drain off. This feature allows the insulation to resist any R-Value loss. Once again, in the attic and roof cavity, where air moisture is problematic, non-absorbency is key.

Corrosion Resistant

Fibreglass insulation doesn't corrode metal objects, and does not damage steel framing. Because of the glass fibre composition, and the built-in resistance to moisture damage, fibreglass products do not support any biological or bacterial growth. This is a principal product feature, especially in parts of the home where air moisture (humidity and condensation) might be common. With fibreglass insulation products, professional installation is key for long-term performance. Expert installers abide by the building code, and follow the manufacturer's specifications. As for the homeowner, it's important to be well informed, so that astute decisions are made during the installation process. At Great Northern Insulation, the in-house team can recommend the product and installation that will deliver the best results and the best return-on-investment. For more information, visit the website at www.gni.ca or call toll-free at 1-800-265-1914.

Western Ontario

935 Keyes Drive
Woodstock, Ontario
Canada N4V 1C3

Phone: 1-800-265-1914

Fax: (519) 539-7946
TOLL FREE: 1-800-265-1914

Muskoka, Haliburton, Northern Ontario

1027 Elwell Park Road
Gravenhurst, Ontario
Canada P1P 1R1

TOLL FREE: 1-800-265-1914

Central Ontario

29 Ferndale Industrial Drive
Barrie, Ontario
Canada L4N 9V5

TOLL FREE: 1-800-265-1914

Greater Toronto Area

2 Guided Court
Etobicoke, ON
M9V 4K6

TOLL FREE: 1-800-265-1914

GTA East

103 North Port Road
Port Perry, Ontario
Canada L9L 1B2

TOLL FREE: 1-800-265-1914

South Central Ontario

450 Industrial Dr,
Toronto (Milton), Ontario
Canada L9T 5A6

TOLL FREE: 1-800-265-1914

Eastern Ontario

1035 Moodie Dr #1,
Nepean, ON
K2R 1H4

TOLL FREE: 1-800-265-1914

Niagara Region

25 Lincoln Ave
St. Catharines, ON
L2P 2C7

TOLL FREE: 1-800-265-1914


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HomeStars has ranked Great Northern Insulation as a company that goes above and beyond in every aspect of business for the year of 2021.

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HomeStars has ranked Great Northern Insulation as a company that goes above and beyond in every aspect of business for the year of 2022.


GNI is the Authorized & Trusted Insulation and Air Sealing Installer for Lowe’s

Trusted for Over 40 Years

Over 40 Years in Business

At GNI, we service your project with the most experienced staff in the industry. Ongoing professional development is an obsession at GNI and we will not compromise at any level to bring to our customers the very best Installers, Sales Representatives, Customer Care Personnel, Field Superintendents, Estimating and Technical Support to your project.

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Heatlok® Soya HFOTM leverages Honeywell’s latest Solstice® Liquid Blowing Agent technology. This new hydrofluoroolefin (HFO) blowing agent is the most environmentally conscious blowing agent produced to date, with a zero ozone depletion potential (ODP) and a global warming potential (GWP) of 1, which is more than two orders of magnitude (99.9%) lower than HFCs used in this industry.


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3MTM energy-saving products are designed to keep warm air in, and cold air out, while keeping energy bills down. Products optimize energy efficiency in buildings and homes; improve indoor environment for occupants; and effect the reduction of seasonal energy costs. 3M products are authorized for LEED credits (Leadership in Energy/Environmental Design).

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Mike Holmes and his son Mike Jr. (MJ) convert MJ’s bachelor bungalow into a two-storey home for MJ and his girlfriend Lisa. Choosing the newest materials and build techniques, the father and son team follow Mike’s famous motto – “Make it right.” The show can be watched on HGTV and DIY Network.


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CLIMATIZER PLUS cellulose insulation is manufactured from a minimum of 85% locally-sourced post-consumer recycled newsprint. Non-toxic additives are applied to the uniquely fiberized paper generating a building material with superior thermal and acoustic properties, as well as exceptional resistance to fire, moisture, mould and pests.

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