Spray Foam Insulation

Spray foam insulation is widely recognized as the most versatile insulating product on the market today.

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Firestopping

Firestopping is the practice of utilizing a system of joint and penetration sealants on a fire-rated wall, ceiling, or floor assembly within a building.

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Exterior & Rooftop Ductwork Insulation & Air Sealing

Proper insulation of exposed rooftop ductwork increases mechanical efficiency and unit lifespan.

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Tank Insulation

Spray foam insulation provides an excellent thermal barrier and is an extremely efficient insulator.

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Roof-Wall Junction Air Sealing

Air sealing the entire building is important to improving its overall air quality and energy efficiency.

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Air Leakage Solution

Our goal is to ensure that your building envelope is properly weatherized and performing at the highest level.

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Insulated Panelling & Cladding

Insulated panelling and cladding can restore your building’s look and useful life.

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ICI Retrofit

As building science specialists, we effectively air seal buildings, so that air and moisture issues are remedied at source.

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Client Feedback

Over the past several years, and two different houses, I have purchased just about every service that GNI sells. I just wanted to say that I have always been pleased with the people I have dealt with, their skills, professionalism, and dedication to doing the best job possible. It makes one aspect of home ownership less stressful!

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Bill Rathborne

We live in an older home and recently had it insulated and air sealed by Great Northern Insulation. Since the work was completed, we've noticed a dramatic decrease in our heating and air conditioning bills, as well as much more comfort in our home. Dollar for dollar, proper insulation is an effective way to save energy.

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Lou Brehm

Your sales rep addressed my needs to a "T". Also, I have to congratulate the installers who were extremely knowledgeable and I appreciate their workmanship. Thanks so much!

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Jennifer Peters

The insulators were great, as was the sales rep. I will be back for more!

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Bob Bray

Thank you for all the help and thoughtful staff.

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Louise Parsons

I am very happy with your work. It’s nice to see a sub–contractor that takes care to protect things and cleans up well after they’re done.

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Tony Ronco

I was pleased with the quick response I received from Great Northern. Their installers were courteous, tidy and efficient.

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Sandra Elliott

Proudly Serving all of Southern Ontario

Great Northern Insulation - Better Business Bureau Profile.

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.

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

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

Great Northern Insulation is recognized as Canada's largest full-service insulation contractor. GNI is 100% Canadian owned, proudly serving Ontario customers since 1980.

Do it right the first time
- with foam masters^TM

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.

Huntsman HEATLOK® SOYA HFO™

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.

3M^TM products.
Quality + Performance = Savings

3M^TM 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

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.

The GNI crew have been featured installing insulation on Love It or List It - have you seen our logo in an episode?

Climatizer

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.

Commercial Retrofit

Proudly Serving all of Southern Ontario