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How We Train

How Great Northern Insulation Trains Our Insulation Installers

Great Northern Insulation may have begun with two entrepreneurs and a single truck, but we have grown to be one of the largest educators in the Ontario insulation industry. We set our bar high for customer satisfaction, and our professional insulation training standards are designed to provide consistent results that leave you feeling a difference in comfort, health and safety. To achieve this, we combine the strengths of our industry experience, manufacturing and government partnerships, and tenured training staff.

We train and employ full time insulation installers across Ontario, and it takes more than luck to generate hundreds of positive reviews from our customers. Our approach to training begins with understanding the fundamentals of building science. From there, our insulation installers receive hands-on-training within a controlled environment. We are constantly looking for ways to improve our processes, and even our trainers are constantly being trained for new innovative building techniques. Our longest standing insulation installer celebrates his 40th year with Great Northern Insulation.

The Science Behind Training Insulation Installers

Great Northern Insulation has been an Ontario insulation contractor for more than 40 years, and in 2020, our longest standing employee dates back to our founding in 1980. A lot has changed since then, including a focus on sustainable insulation and building design. Insulation and air sealing are at the heart of Net Zero Homes, Passive Homes, and increased energy efficiency in general.

For this reason, our professional insulation training starts online or in person with a primer on building science. These learning modules connect the importance of insulation with modern building code and beyond. Everyone learns differently, so we are always looking for new, innovative ways to elevate our digital training. This includes online classes and pre-rerecorded videos.

While understanding most of these concepts begins online, much of the learning process involves gaining experience within a controlled environment or in the field. We pair every new insulation installer with a mentor who has specialized in that type of insulation. Whether it is fiberglass batts, blown-in cellulose, or spray foam, each installer understands how to prepare the jobsite and properly install insulation to maximize its effectiveness.

Training from Experience

The most experienced trainers at Great Northern Insulation have all gained their knowledge through countless hours in the classroom, and even more practicing their craft. Whether we are researching the performance of new sustainable products, or reinventing proven insulation methods, we document and train our installers on an ongoing basis. This allows us to make sure insulation installation is perfected before we step foot on the jobsite.

Pictured: Dense packed cellulose insulation with cross bracing designed and installed for training purposes.

Training for Insulation Certifications

Some insulation materials, such as spray foam and fireproofing, require certification from the manufacturers. This ensures that our installations meet code and perform without fail. We are proud to admit that our passion in the industry drove us to be leaders in the certification process of spray foam insulation. We are just as excited to be working with manufacturers and government bodies on the next new product.

We do not stop with material certifications. One aspect of our training that has not changed since the founding of Great Northern Insulation is our dedication to health and safety. Above all else, we make sure that our insulation installers are trained to safely handle the materials they will work with. This includes providing and training them how to use personal protective equipment.

Every insulation installer at Great Northern Insulation is also trained and certified for Observation Based Safety through IEC, Joint Health and Safety through WSPS, Working At Heights administered by licensed trainers, and First Aid. We take safety seriously.

Training Our Communities

We have locations across Ontario, including Comber, Woodstock, Milton, Niagara Falls, Barrie, Port Perry, Gravenhurst and Ottawa. This allows us to employ people in your local community. They personally experience the local climate and know how to help you maximize energy efficiency and comfort. When you choose Great Northern Insulation, you are also choosing a local insulation contractor that supports your community.

We believe that a big part of our training comes from who we train, not just how we train.

Training for Insulation Rebates

Government rebates typically involve extra steps and processes to the installation, such as preparing the correct documentation. We take the time to partner with government bodies and Registered Energy Advisors to create learning modules as part of our professional insulation training. This way, both the insulation and rebate process are as seamless as possible. You can always expect the best customer experience from Great Northern Insulation.

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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