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The Importance of Insulating Foundation Walls

June 14, 2016

In short, insulating basement foundation walls will provide thermal protection, moisture control, better air circulation, and even mold protection. In most climate zones (especially across Canada) insulating the foundation is well worthwhile - it's a cost-effective home improvement with a very good return-on-investment. In fact, across the country, researchers and industry professionals are in agreement that for all sizes of basements, insulating the foundation makes economic sense. The best news is that basement insulation saves money. Depending on the quality of insulation product, and the installed R-Value, annual energy savings on natural gas and/or electricity can be substantial enough to offset the original cost of installing the insulation. For basement insulation in general, building codes vary according to climate zone, but even today, contractors will debate about whether its best to insulate the foundation from the inside or from the outside of the home. Whether it's exterior basement insulation, or interior, there are viable advantages to both. Here, a professional contractor would be able to recommend the best approach, based on the particular circumstances of the home. The important thing is to create an effective thermal envelope, a good air barrier, and an effective system that blocks moisture. For new construction, retrofitting, or renovations, it's essential to choose an insulation product that delivers maximum performance. For the professionals in the business, insulating foundation walls is best accomplished with Spray Foam Insulation. In the basement, it's the ultimate for energy efficiency. SFI performs better than comparable insulation products, and requires only a single application. It's an application that creates airtightness; blocks air leakage; prevents moisture form accumulating; and installs a very high R-Value rating. In the basement, SFI has more benefits/advantages than any other product. Great Northern Insulation specializes in Spray Foam Insulation. Considered the best product on the market, it offers the ultimate in performance, with superior results that are hard to match. But it's a premium product and application, and could be costly for some homeowner budgets. As such, GNI offers homeowners another option for insulating basement foundation walls - it's the "hybrid" installation, which combines SFI with another product in a fully integrated application. The idea behind the "hybrid" installation is that the two products (one being the Spray Foam Insulation) work together. Professionally installed, the best characteristics of each product are maintained, and the project retains a cost effective component for the homeowner. The "hybrid" install provides excellent results, particularly in the basement area, where controlling the air and moisture is critical to energy efficiency. The result: energy savings and comfort at one time. In any residential home, insulating the basement foundation walls is key to making the structure energy efficient. Beyond being important for the building envelope, it's an investment that has a fairly quick "payback" period. Indeed, in many cases, the savings on winter heating and summer cooling can substantially offset the original cost of the project. This is truly a home project that is worthwhile for the short-term benefits inside the home, and the longer-term dollar savings.

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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