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Upgrading Home Insulation Can Make a Big Difference

February 26, 2017

Upgrading existing insulation in a residential home will dramatically decrease energy usage, and noticeably reduce utility bills. Today, one of the better options is spray foam insulation - a high performance product that delivers more benefits than comparable insulation products. Spray foam is a premium application, but with long-term results that make the initial investment well worthwhile. With a professional installation, the spray foam option makes it possible to focus on the areas of the home that are most vulnerable to energy loss. In this way, the primary sources of energy waste can be fully addressed, and going forward, other areas of the home can be tackled.

Insulating the attic and roof cavity

With the attic being a major source of heat loss in any home, insulating with spray foam offers an all-in-one approach - it's an air barrier, vapour barrier, and thermal insulator at one time. In fact, air sealing and insulating the attic floor is one of the best options for improving energy efficiency. It will quickly translate into one of the best returns-on-investment for the home. One way for a homeowner to save money, especially with spray foam, is to insulate in steps. This will allow a contractor to install spray foam incrementally, yet deliver results even after the first application.

Insulating rooms over the garage

Rooms over garages are often uncomfortable. They are either very hot or very cold, depending on the season. The cause is air leakage coming in and out of the garage below. Here, conventional insulation doesn't seem to do the job because the space cannot be sufficiently air sealed. This is where spray foam can really perform. The application adheres completely to the garage ceiling, providing an effective air seal that is continuous. When properly applied, every gap, opening, and crack is sealed, minimizing air leakage, controlling air moisture, and providing high R-Values.

Insulating exterior walls in the home

In homes where exterior walls are inadequately insulated, increasing the R-Value can make a big difference with heating and cooling bills. The "drill and fill" approach will better insulate a home, without having to do a major renovation. With this retrofit, the wall cavities are filled with loose-fill insulation throughout the exterior of the building structure. In this way, a thermal barrier is created, without any structural change. "Drill and fill" is possible from the interior of the home or from the exterior. And with R-Values significantly upgraded, the energy savings are considerable.

Insulating basement foundation walls

In most residential homes, approximately 30% of overall heat loss is through the basement walls. There are a number of conventional approaches to upgrading basement insulation, but more and more contractors are recommending spray foam. With one application, spray foam can do it all: it provides an insulating envelope; an air barrier; and a vapour barrier. In spaces like the basement, all three components are necessary in providing maximum energy efficiency. With a spray foam application, air movement is blocked, air moisture is prevented, and insulation is optimized.

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
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Canada P1P 1R1

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29 Ferndale Industrial Drive
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Canada L4N 9V5

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Etobicoke, ON
M9V 4K6

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Canada L9L 1B2

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South Central Ontario

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Toronto (Milton), Ontario
Canada L9T 5A6

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Eastern Ontario

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

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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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