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Fiberglass Insulation - The Inside Story

March 25, 2016

Fiberglass is a family of products widely used in countless applications - everything from automobiles, to boats, to roofing, to insulation. In residential and commercial buildings, we know it as a thermal insulator. The idea behind fiberglass insulation is to slow down the spread of heat and/or cold (in addition to sound). The structure of the fabricated fiberglass essentially traps air, and therefore keeps a home nice and warm in winter, and nice and cool in summer. As a thermal insulator, fiberglass enhances energy efficiency. In residential homes, fiberglass insulation can be easily installed throughout the "building envelope" - the walls, the ceiling, the attic cavity, even in the garage. Fiberglass "batts" are quite common, and are available in pre-cut widths and lengths that are customized for easy installation. Fiberglass is also sold as a "loose fill" product, which is blown into a given space and provides an effective thermal blanket of insulation. The fiberglass products have become quite attractive as a cost-effective approach to home insulation. In terms of installation, a professional approach is highly recommended. Indeed, there are some risks with exposure to fiberglass, especially during the installation. Skin contact can be problematic, and inhalation of fiberglass particles can be quite serious. This is why professional installers are specially outfitted with the proper equipment and appropriate protective wear. Experienced insulation contractors are well equipped to install and/or remove fiberglass insulation - something that is not suitable for a DIY project. Inasmuch as fiberglass products provide effective thermal insulation and enhanced energy efficiency, there are also some downsides to the installation. To begin with, even a professional install will not entirely stop air movement in a given space. Additionally, fiberglass does not fully prevent vapor and moisture from accumulating. These are big issues in a space like the attic or roof, because air and moisture can compromise the effectiveness of insulation. In short, fiberglass is not totally effective as a standalone product. One of the big downsides with fiberglass insulation is wetness, especially in spaces like the attic and roof. A wetted fiberglass environment will slowly lose its product integrity, and will eventually lose its valuable R-Value. If a situation like this were left to deteriorate, the only recourse would be to remove and reinstall all of the insulation. Even worse, wetted fiberglass insulation may cultivate mold - and here, nothing short of expert remediation will suffice. Safe removal and reinstallation of the insulation will be required. For the experienced professional, a good alternative to fiberglass insulation as a standalone product is the "hybrid" method. This method combines fibreglass insulation with spray foam insulation into one install. And while each product delivers specific benefits, together they deliver excellent results, along with a cost effective element to the overall project. The spray foam provides exceptional sealing and thermal insulation and the fibreglass provides added thermal insulation and significant dollar savings throughout. The "hybrid" installation is well regarded by professional installers, both as a highly effective approach to insulation, and a very cost-conscious approach for the homeowner.

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


Great Northern Insulation - Better Business Bureau Profile.

Homestars Best of 2021 Award

Best of 2021

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

Homestars Best of 2022 Award

Best of 2022

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.

100% Canadian

100% Canadian

Great Northern Insulation is recognized as Canada's largest full-service insulation contractor. GNI is 100% Canadian owned, proudly serving Ontario customers since 1980.

Foam Masters

Do it right the first time
- with foam mastersTM

January, 2021 regulatory phaseout of hydrofluorocarbons (HFCs) with the introduction of WALLTITE CM01. Using hydrofluorolefins (HFOs) with lower global warming potential (GWP) compared to HFCs, WALLTITE CM01 is the next generation of spray foam insulation.



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.


3MTM products.
Quality + Performance = Savings

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).

Holmes and Holmes

Holmes and Holmes


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.


Enbridge Incentives

The Home Efficiency Rebate Plus program offers up to $10,000 in home reno rebates – and Great Northern Insulation can pave the way.


Great Northern Insulation proudly abides by a renovation-specific Code of Conduct set by RenoMark™.


We are Verified & Bonded by eRenovate. When you choose to proceed with our services through their platform, you receive the gaurantees set forth through their program.

As Seen on Love It or List It

The GNI crew have been featured installing insulation on Love It or List It - have you seen our logo in an episode?

Climatizer Cellulose


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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