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Start a Career in Building Science with On-the-Job Training

January 10, 2022

Start a career in building science title card with spray foam installer

Like the idea of making homes more comfortable and energy efficient? Join Great Northern Insulation as a crew member: we will teach you everything you need to know with complete on-the-job training. 

What are the job requirements? 

We talked to Andrew Grabstas, Branch Manager for our Milton location, about the qualities he looks for in a GNI employee, and he says that while experience isn’t necessary, a positive attitude is his #1 requirement. 

“A great attitude and good people skills are really important,” he says. “You’re interacting with customers, of course, but you’ll also be part of a 2- or 3-person crew. We want people who others can enjoy working with, who can keep up morale on their team, no matter who they’re assigned to that day or what the project involves.” 

In addition to your ability to “play well with others,” you’ll also need to check these boxes: 

  • You’re 23+ with a clean G license. Right now, we need people who can drive our trucks, and our insurer says they have to be at least 25. (Our 5-tonne trucks are similar to a larger U-Haul.)
  • You’re calm if there’s conflict. If a client is unhappy or confrontational, you’re able to stay calm and not engage. 
  • You’re okay with early mornings and longer days. The day starts at 6:00am at the shop, and while most days you’ll probably be back by 4:00 or 5:00, some may be longer, depending on the job. 
  • You don’t mind small spaces (and the occasional spider). Installing insulation means getting into some tight spaces like areas of attics and crawl spaces. 
  • Getting dirty doesn’t bother you. While you do wear protective clothing, the dust and cobwebs in those small spaces will inevitably get on your hands and clothes. 

photos of a career in building science

Do I need a high school diploma to apply? 

Nope. Just a good attitude, a solid work ethic, and a willingness to learn.

What is the training like? 

You’ll start by  participating in a series of videos and courses, then we’ll bring you into the branch and add you as a third to an experienced 2-person crew. Initially, you’ll be responsible for non-installation duties like site prep and cleanup. But you’ll be observing and learning from the installers every day, and it won’t take long before you become a knowledgeable installer yourself. 

Insulating Attics - 3-6 months of training
Installing Fibreglass Insulation - 9-12 months of training
Installing Spray Foam Insulation - 1+ year apprenticeship to become a licensed spray foam installer

We have a number of positions open across several of our branches, all offering competitive hourly rates. Interested in making a great career move? Give us a call, we’d love to tell you more.

Multiple roles currently available

Click here to view our open positions.

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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