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Spray Polyurethane Foam Insulation. It's Become the Favourite of Professionals.

January 20, 2016

Professional insulation contractors are routinely recommending Spray Polyurethane Foam as an insulation option for residential homes. And because of the excellent outcomes, SPF is quickly becoming an industry favorite for installers across the country. For very expansive spaces like attics and roofs, the product is ideal, and simply better than any other application. SPF is an installation that requires expertise. Professional installers employ specialized equipment to ensure a "blanket" of insulation that is completely consistent and uniform. Installation experience is also a must, because the application starts off as liquid foam, and very quickly expands and hardens. The finished application results in a dense layer of insulation that is fixed. Unlike most other insulation products and applications, SPF will envelop a space entirely, allowing an expert installer to seal every possible opening, hole and gap. Airtightness is essential for every insulation project, and the SPF product does better than anything else - even those hard-to-reach areas in the attic and roof can be completely coated and sealed with one application. In terms of product efficacy, Spray Polyurethane Foam is unrivaled. It's an installation that can do a lot with a single application. It installs higher R-Values than other insulation products. It doesn't absorb moisture, and serves well as an excellent vapor barrier. The finished application is mold resistant, and will not compact or lose its product integrity over the long term. For the most part, industry professionals regard SPF as a more costly project, but one that will pay for itself with long term savings on energy bills. With a professional install, an SPF application will last a lifetime, and will not require replacement or replenishment. Indeed, the long-term benefits, and the substantial savings on heating and cooling, make the project well worth it. Today, many homeowners have their focus on energy efficiency and on energy savings. Spray Polyurethane Foam will deliver both, and will ensure the cost savings at the end of the year. But no application will perform at peak without a proper install. And here, it's the professional contractor who has expertise with the SPF product, and skill with the complex application. SPF is not a project for the inexperienced contractor, and certainly not for the inexperienced homeowner. It's therefore important to contract a trained professional who knows the ins and outs of both product and installation. The risk of shoddy work isn't worth the stress or added cost of a re-working. Clearly, its best to do the job right the first time - properly and professionally. For Spray Polyurethane Foam, a professional approach is very much preferred. An established insulation company will offer installers who are qualified, licensed and certified - in other words, specialists in their field. They know how to prep a work-site; they use the right safety gear; and they properly safeguard residents (or occupants) during the entire installation. Above all, a professional installation team ensures a standard of workmanship that will deliver optimum outcomes for the homeowner. So much so that product and installation are fully backed by the contracting company's commitment to complete customer satisfaction.

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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