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With Basement Insulation, it's Important to do it Right the First Time

March 20, 2016

Basements usually account for a significant amount of heat loss, particularly when the space has been poorly insulated. It's because basement walls are expansive, and often un-insulated above and below grade. Worse, there's undesirable air leakage, whether it's through basement windows or through gaps and cracks in the foundation. The good news is that there's plenty of room for improvement. In many situations, basement insulation can be combined with general repairs and renovations, or waterproofing the outside of the home, or when finishing the basement itself. Any good insulation professional will recommend a proper assessment of the basement prior to doing any insulating work. Water leaks, for example, must absolutely be corrected. Whether minor or major, water leaks must be addressed and remedied in order to prevent future calamity. Dampness is also a concern - high levels of interior moisture can easily compromise the integrity of installed insulation. Cracks and crevices in the foundation may seem innocuous, but they allow air and moisture into the building structure - both of these make trouble for an insulated space. With basements, there is always debate about insulating the outside or inside. Here again, a good contractor can advise what's best, based on the conditions, and the project budget. Clearly, in an existing home, there are advantages to insulating from the inside. Work can be done regardless of weather, the final install can be part of a bigger basement renovation, and for the most part, the installation can be uninterrupted. What's most important is to do it right the first time, preferably with a professional, using a high quality insulation product, and expediting a quality installation. Taking into consideration the issues and concerns of a basement, the important consideration is what product to use. Many professionals are recommending Spray Polyurethane Foam as the all-purpose product and installation. They are opting for SPF because it can achieve so much with one application, and in the basement, this is particularly relevant. SPF creates a space that is completely airtight. It stops both air movement and air leakage. And finally, it installs the highest R-Value rating per installed inch. In short, it delivers far more benefits than other products. Spray Polyurethane Foam is widely regarded as premium insulation. It's a costly install, and may not always suit a homeowner's project budget. As an alternative, Great Northern Insulation has customized a "hybrid installation" that delivers excellent results while remaining cost-effective. It's an installation that combines Spray Polyurethane Foam with an additional insulation product in one application. The SPF provides the sealing and insulation essential for the basement, while the additional insulation product provides added insulation and a cost-effective component. The results achieved with the "hybrid installation" allow for measurable cost savings on winter and summer utilities. And with a well-insulated basement, the long-term annual savings make for a reasonable "payback" period. It all makes for an original project investment that is worthwhile, and that will suit most homeowner budgets.

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 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™.


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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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