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Spray Foam Insulation

November 06, 2014

When a contractor recommends spray foam insulation, it refers to an insulation compound that is commonly known as polyurethane foam. Essentially, the compound is "sprayed" into an expansive cavity, like the attic, the roof, or the ceiling. Using special equipment, a professional installer sprays the foam out as a liquid, and allows it to expand and then harden into the thick, dense coating that provides the final insulating layer.

A well-installed application will cover everything in sight - and that includes holes, gaps, cracks and crevices. Spray foam insulation is impermeable to air and moisture. And this is exactly why the professionals prefer this product to anything else. This product is multi-functional: it does a superior job of sealing; it provides better R-values; and it even adds structural strength. The team at Great Northern Insulation believes there's NO better product on the market.

Spray foam insulation is recommended for new construction, renovations, and retrofits. But no product will perform to its maximum potential without a quality installation. The installer must be trained, skilled and experienced. And the install must meet recognized construction and building codes, as well as local by-laws. Above all, the product must be applied according to the manufacturer's specifications. It's a project that must be executed right the first time.

Because of its chemical nature and a unique application process, the spray foam insulation product needs special handling - that's why GNI does not recommend a do-it-yourself project. A professional installer understands the nuances of the product, and the complexities of the installation. A professional also knows how to properly prepare the work site; how to make use of safety equipment and protective gear; and how to safeguard occupants during the install.

In general, spray foam insulation is more costly than other insulation products. However, with a cost-benefit assessment, its clear that the upfront cost delivers value. This is a premium product that provides premium benefits - the application lasts a lifetime; it doesn't need to be replaced or replenished; and it delivers a "pay-back" between 2 and 7 years. It's truly the definition of a good investment, especially when considering the long term.

The popularity of spray foam insulation has grown exponentially. It's because the product is so good, and the benefits so numerous: seasonal heating and cooling costs are measurably reduced; R-values are enhanced wherever installed; and the movement of air and moisture is curtailed (making for better air circulation). As well, Great Northern Insulation has observed higher re-sale prices on homes that have been insulated with spray foam.

In today's contracting environment, shoddy work seems common, and spray foam insulation is no exception. But at Great Northern Insulation, things are different - our installers are all trained and certified; the products we sell and install are warrantied; and our manufacturers' warrantees are sound. Our people are insured and covered by WSIB, and above everything, our customer's satisfaction is guaranteed.

When customers ask if spray foam insulation is the best choice, we invariably respond that it's best overall insulation system when compared with the others. For GNI, that's the story.

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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