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Getting Quality Performance from Fiberglass Batt Insulation

May 18, 2016

Fiberglass batt insulation works in two ways to provide thermal insulation. First, air is trapped in the tiny spaces built into each batt, slowing down conductive heat movement. Second, the glass fibers reduce radiant heat loss, adding further insulation value. Important to note is that small air voids (within the fiberglass batts) will slow heat flow, while larger voids will actually do the opposite. These are dynamics that will impact the performance quality of the installation. For many a homeowner, installing fiberglass insulation might seem like a viable DIY project. In short - it's not. For the maximum in product performance, a professional install is recommended. Expert installers ensure the best contact between batts and surfaces, as well as a snug fit between batts. Doing otherwise will compromise both air leakage and thermal performance. As well, an expert install will guarantee that an effective moisture barrier will be installed accordingly. Fiberglass batt insulation must also accommodate irregular cavities, ductwork, plumbing and wiring. Here, the batts must be precisely cut to fit, and placed strategically to allow for optimum performance. This is not a time for installation shortcuts, a hurried job, or a sloppy install - even by an expert. For the best long-term results, it's important to follow manufacturer specifications, as well as any prescribed building code. Not doing so will present future complications. Fiberglass batt insulation will insulate properly when air can be effectively trapped. As it is, the batts are not meant to be an "air barrier" themselves, which means that a space like the attic still requires sealing. This is where spray foam insulation may play an integral part in complimenting the performance of the batts. For the professionals, sealing a space tight (whether the attic or the basement) is essential for any insulation product to deliver their advertises outcomes. To have a building inspector or energy auditor discover flaws and weaknesses in insulation after a job has been done is counter-productive. This is work that should be done right from day one. It means hiring an installation team that understands fiberglass batts; has expertise with the install; and has a quality approach to the overall project. More importantly, it's essential to do business with a company that is reliable and reputable - price shopping will not always work. Since every home is going to be different, installers need to fully appreciate the space that's being insulated - it could be a cathedral ceiling; an area with pre-existing framing; even thermal defects that came with the original construction. Whatever the case (and especially during a renovation), it's best for trades to work together to ensure the best results. Leaving even the smallest details unattended can have an impact on the integrity of the insulation and on the R-Value. Where fiberglass batt insulation is recommended or specified, there is no alternative to installing everything properly, and without cutting any corners. Even with possible extra labor costs, there are no disadvantages to doing everything right the first time - and long term results will show.

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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